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In order to provide environmental solutions for the treatment of oily residues (slop oil) from refineries, formulations with surfactants were proposed according to the type of dispersed system of the slop (crude oil emulsified with water and/or solid particles). Samples were collected in 12 tanks located at the Oxialquilados Venezolanos C.A., Barcelona Plant (Anzoátegui, Venezuela), performing physicochemical tests for the identification of the dispersed system (solubility, wettability, stability, water content) and microscopic observations (morphology and particle size). The results indicated heterogeneous slop samples with a water content of 2%–60% vol/vol consisting of single or multiple emulsions, with droplet sizes between approximately 10 and 30 micron; others formed by sludge or suspension (solids/oil/water). For the destabilization of these systems, aqueous and organic cleaning solutions were designed, determining the percentage of oil separated in the bottle tests at optimal and simulated field conditions. Field tests with volume scaling of the slop tank reported efficiencies of 63%, 85%, and 100% when treating the slop TK‐17, TK‐36, EE, respectively; for the mixture (Pulmon‐2) an efficiency of 47%. By combining heat treatment and two demulsifiers was possible to treat the slop TK‐17 (multiple emulsion). A considerable volume of water can be drained from the tanks for use in the plant. In conclusion, the surfactant formulas were effective in the recovery of a significant amount of crude oil, making it feasible to return it to the generating entity. [ABSTRACT FROM AUTHOR]

Copyright of Chemical Engineering (China) / Huaxue Gongcheng is the property of Hualu Engineering Science & Technology Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Iraqi Journal of Chemical & Petroleum Engineering is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Under laboratory conditions, a novel composition comprising ND-12, Gossypol resin, and isopropanol in a ratio of 4:1.5:0.5, denoted as A-3, was investigated for the first time. Its efficacy in the demulsification of Muradkhanli and Umbaki heavy oil samples, with emulsion degrees of 41% and 31% respectively, was studied, along with its effects on freezing point, dynamic viscosity, and corrosion rate in hydrogen sulfide reservoir water. The optimal concentration of the reagent was determined to be 600 g/t. Over a two-hour period, the demulsification of Muradkhanli oil was conducted at 400 C, 500 C, and 600 C, and of Umbaki oil at 400 C, 500 C, 600 C, and 700 C. The minimum amount of ballast water, with optimal composition thickness participation, was observed at 600 C for Muradkhanli oil and 700 C for Umbaki oil, constituting 0.1% and 0.13%, respectively. The freezing temperature of Muradkhanli oil decreased from +12.50 C to +50 C, and Umbaki oil from +110 C to +40 C due to the optimal viscosity effect of A-3 composition. At +200 C, with 600 g/t of composition A-3, the dynamic viscosity of Muradkhanli oil decreased from 201 Pa⋅s to 111 Pa⋅s and from 1540 Pa⋅s to 237 Pa⋅s for emulsion degrees of 0.0%, 5%, 10%, 20%, 30%, and 41%. At +400 C, the dynamic viscosity of Umbaki oil decreased from 182 Pa⋅s to 64 Pa⋅s and from 1183 Pa⋅s to 163 Pa⋅s for emulsion degrees of 0.0%, 5%, 10%, 20%, and 31%. Furthermore, A-3 composition exhibited higher efficiency in affecting the corrosion rate in hydrogen sulfide formation water compared to its constituent Gossypol resin. While the corrosion protection effect of Gossypol resin at optimal concentrations was 90%, A-3 composition reached 98%. These results indicate the complex and synergistic effects of the A-3 composition due to its constituent components. In conclusion, numerous laboratory tests revealed that the A-3 composition, comprising ND-12 demulsifier, corrosion agent Gossypol resin, and isopropanol solvent, is suitable for the demulsification, freezing point reduction, and dynamic viscosity adjustment of heavy oils such as Muradkhanli and Umbaki, as well as for effectively influencing corrosion rates in acidic environments. Therefore, the application of the new A-3 composition is recommended as an economically and ecologically efficient reagent for demulsification and transportation of heavy oils in mining conditions, as well as for corrosion protection of internal surfaces of transportation preparation facilities. [ABSTRACT FROM AUTHOR]

ABSTRACT The anti‐emulsification property of lubricating oil is an important index to measure the quality of oil. In this paper, the behaviour of surfactants such as lubricating oil additives at the oil–water interface and the influence of the position of ethylene oxide (EO) and propylene oxide (PO) in the block polyether demulsifier on the demulsification effect were investigated by molecular simulation and experimental verification. The properties of seven lubricating oil additives with different functions and two pairs of isomers were investigated by molecular simulation, and their demulsification effects were verified by experiments. Some simulation results such as interface thickness and density distribution can accurately predict the experimental demulsification effect. Moreover, it was found that the position isomerism of surfactants affected the demulsification performance by changing the lipophilic balance and interface properties. The demulsification performance of sequenced copolymers is generally better than that of anti‐sequenced copolymers. The accurate prediction of molecular dynamics simulation makes the selection of lubricating oil demulsifier more extensive and has practical application value. [ABSTRACT FROM AUTHOR]

The task of the study was to test new demulsifying compositions for high pyrolysis coal tars originally intended for separating emulsions based on heavy petroleum oils. Coal tars with a specific gravity of 1.243–1.261 were investigated and light coal tar with a specific gravity of 1.185 was used for comparison. Demulsifying compositions for heavy media were prepared on the basis of Dissolvan (Clariant) reagents, "PM" demulsifier was used as a main indicative reagent for breaking of light coal tar emulsions. To determine the efficiency of dewatering a "bottle test" was applied, Fourier transform infrared spectroscopy analysis of the distillate residues was performed to determine the functional group of potential stabilizers. The composition of the mineralized and dispersed solid stabilizers was determined by X-ray fluorescence (XRF) spectrometry. The results showed that for the heavy coal tar emulsions, some compositions based on oxalkylated resin showed high activity and separated up to 17–19% of water, in contrast to the indicative demulsifier 0–3%. An attempt has been made to investigate the mineral composition of emulsion stabilizers transferred into the water part and remaining in the coal tar (sludge). The results of XRF spectrometry suggested that Zn-pyridine compounds are the most likely hydrophile stabilizers of heavy coal tar emulsions. [ABSTRACT FROM AUTHOR]

Demulsifiers are widely used to increase the separation between oil and water. The more common ones contain hazardous ingredients (aromatic solvents, non-biodegradable active components), which can negatively affect human health (especially the respiratory system) and the environment. The presented study evaluates the feasibility of implementing a non-toxic, highly biodegradable, and environmentally friendly demulsifier in oil mines in the Paris Oil Basin (France). The standard commercial demulsifiers were tested together with four other, non-toxic and biodegradable ones. This investigation employed the bottle test of demulsifiers, which contained grind-out tests using the centrifuge. The test determined the residual water content in separated water. Four types of oil were used for this test, plus a fifth sample, which contained a mix of oil from the four wells, based on the ratio that existed in the installation. The investigations took place at four oil mines in Paris Basin, France. The tests proved that, for all oil types, a novel, highly biodegradable, oil-soluble demulsifier containing polyimine derivative and EO/PO block copolymer (RSN = 10) in a non-toxic solvent, could be used to treat oil during the exploitation process in the reservoir. This provided the best separation properties of all tested samples and the lowest water content in the oil. This solution can potentially mitigate numerous logistical, storage, and environmental issues while enhancing job-related safety aspects. Our proposed approach provides a greener method that could be implemented in the industry field. [ABSTRACT FROM AUTHOR]

The waste gas mud generated during the drilling process of the Yanchang gas field is treated with solid-liquid separation, oil/water recycling, and solidification of bottom mud. Research shows that after solid-liquid separation of waste mud, the reduction rate reaches 82.11%, and the oil recovery rate and water content in the recovered oil are 94.50% and 0.43%, respectively; after chemical oxidation floeeulation filtration treatment, the separated effluent has a light transmittanee of over 98. 5% and can be used for the repreparation of oilfield working fluids; the oil content in the sediment is 4.56%, and after solidification treatment, the compressive strength can reach 15.977 MPa. It can be used for laying well pads or roads in oil and gas fields, and the leachate from the solidified form meets the water quality requirements of the "Comprehensive Wastewater Discharge Standard". [ABSTRACT FROM AUTHOR]

Globally, oil production has steadily increased which causes a rise in the coproduction of oil and water emulsions. These emulsions pose significant challenges in transportation and the oil refinery industry, causing high-pressure drops and corrosion problems due to chlorides in the water. Despite advancements in renewable energy, crude oil remains a primary energy source. The crude oil industry faces numerous challenges, including cost emulsion issues. This study developed a corn oil bio-demulsifier (MFK). A unique demulsifier was tested using FTIR, GC-MS, and TGA. Using the bottle test method, the produced demulsifier MFK was tested with Basrah oil and East Baghdad S1 oil. The emulsion-breaking processes have been studied under several factors, such as settling time, dosage, temperature, pH, water content, and mixing time after demulsifier addition. At 2000 ppm Basrah oil, water separation efficiency reached 75%. For East Baghdad S1 oil, the highest separation result was 43.3% at 4000ppm, after 5 h of settling time at 70°C, with a 30/70 water-to-oil ratio. When studying the pH, the best water separation rate was 86.5% at a pH of 10. The best water content was 92% when the water-to-oil ratio was 50/50, and the best demulsifier mixing time with the emulsion was 2 min with a separation rate of 74.5%. When mixing was increased, undesirable results occurred. This study demonstrated that biodemulsifiers may replace conventional biodemulsifiers in early units while reducing environmental and economic impacts with further study and development.

In order to improve the demulsification efficiency of highly emulsified oily wastewater, a hyperbranched polymer demulsifier HPO-1 was prepared by using hyperbranched polyethyleneimine HPEI and composite fatty acid monomer FO-1 as the main raw materials. Its structure was characterized by infrared spectroscopy and nuclear magnetic resonance 1HNMR spectroscopy. The interfacial activity was evaluated, and the effects of demulsifier dosage,temperature, settling time, and wastewater salinity on the demulsification efficiency of HPO-1 were investigated. The performance of HPO-1 were compared with the on-site demulsifier XCP-16S. The results showed that the interfacial activity and demulsification performance of HPO-1 were significantly superior to XCP-16S. When the dosage of HPO-1 was 50 mg/L, the temperature was 30 ℃, the settling time was 30 minutes, and the salinity of wastewater was 8 350 mg/L, the oil removal efficiency could reach 90.8%, and the residual amount of HPO-1 in the aqueous phase after demulsification treatment was less than 0.5 mg/L. The hyperbranched polymer demulsifier HPO-1 had a good on-site demulsification treatment effect on strongly emulsified oily wastewater from an offshore oil production platform in A Oilfield. After settling time of over 30 minutes, the oil removal efficiency could reach over 90%. The research results showed that hyperbranched polymer demulsifier HPO-1 could meet the demand for fast and efficient demulsification of highly emulsified oily wastewater.

Abstract This study deals with the investigation of the water removal efficiency (WRE) from crude oil using a commercial demulsifier. The impacts of time, demulsifier concentration, and temperature on WRE were experimentally studied. The results implied the fact that temperature plays a substantial role in the demulsification and has a direct correlation with WRE. In addition, while increasing the concentration up to 40 ppm contributed to reaching a higher WRE, it did not have positive effects on efficiency at higher concentrations (overdose) and just led to more demulsifier consumption. The concentration dependence of WRE was also diminished at high temperatures. At higher levels of temperature and concentration, the time required to reach a high WRE was noticeably reduced. In order to generalize the findings of this study, the measured experimental data were employed to design predictive methods for WRE based on two smart soft-computing paradigms, including Multilayer perceptron (MLP) and Gaussian process regression (GPR). Despite the high accuracy of both models, the MLP model presented the best consistencies with experimental data with average absolute relative error and relative root mean squared error of 0.84%, and 0.01%, respectively during the testing (validation) step. Also, a visual description through the contour diagram confirmed the capability of the recently proposed models to describe the physical variations of WRE under various operating conditions. Ultimately, a sensitivity analysis based on the MLP model was undertaken to shed light on the order of significance of operational factors in controlling WRE. Overall, the findings of the current research, in turn, have a satisfactory contribution to the efficient design of the water removal process from crude oil based on demulsifiers.

Copyright of China Surfactant Detergent & Cosmetics (2097-2806) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study deals with the investigation of the water removal efficiency (WRE) from crude oil using a commercial demulsifier. The impacts of time, demulsifier concentration, and temperature on WRE were experimentally studied. The results implied the fact that temperature plays a substantial role in the demulsification and has a direct correlation with WRE. In addition, while increasing the concentration up to 40 ppm contributed to reaching a higher WRE, it did not have positive effects on efficiency at higher concentrations (overdose) and just led to more demulsifier consumption. The concentration dependence of WRE was also diminished at high temperatures. At higher levels of temperature and concentration, the time required to reach a high WRE was noticeably reduced. In order to generalize the findings of this study, the measured experimental data were employed to design predictive methods for WRE based on two smart soft-computing paradigms, including Multilayer perceptron (MLP) and Gaussian process regression (GPR). Despite the high accuracy of both models, the MLP model presented the best consistencies with experimental data with average absolute relative error and relative root mean squared error of 0.84%, and 0.01%, respectively during the testing (validation) step. Also, a visual description through the contour diagram confirmed the capability of the recently proposed models to describe the physical variations of WRE under various operating conditions. Ultimately, a sensitivity analysis based on the MLP model was undertaken to shed light on the order of significance of operational factors in controlling WRE. Overall, the findings of the current research, in turn, have a satisfactory contribution to the efficient design of the water removal process from crude oil based on demulsifiers. [ABSTRACT FROM AUTHOR]

The effect of the demulsifier composition on the destruction of local oil-water emulsions was studied in this work. One of the urgent problems in the development of deposits is to increase the efficiency of the preparation of hydrocarbons in the fields. The solution of this problem makes it possible to significantly increase the degree of oil preparation, reduce the loss of hydrocarbons with drainage waters, thereby improve the environment and bring additional profit to the enterprise. A complex of theoretical and experimental studies was used, consisting in generalization and analysis of literary data, as well as by analogy, modeling, quantitative and qualitative observation, laboratory tests, conducting a multifactorial experiment, data processing using methods of mathematical statistics. Information processing tools based on computer software products were used. The results of laboratory tests of oil-water emulsion, physico-chemical analysis of water composition, new chemical reagents-demulsifiers recommended for field testing are presented. It can be concluded, based on the research conducted, that the demulsifier EASY-DE03-15 is the most effective reagent for dehydration of oil-water emulsions and desalination of MIX samples. [ABSTRACT FROM AUTHOR]

In countries with developed oil industries, the primary objective is to effectively implement the demulsification of water-oil emulsions and provide corrosion protection for facilities during the preparation of heavy oils with stable emulsions for transportation. Consequently, the development of new multi-functional compositions to enhance the efficiency of the emulsion decomposition process and protect the internal surfaces of transport preparation facilities from corrosion remains a pertinent issue. The article presents the results of laboratory experiments on the demulsification of stable water-oil emulsions from the Muradkhanli field in Azerbaijan, which have a dilution rate of 41% (by mass) and provides satisfactory corrosion protection. For the first time, compositions comprising two new ingredients (Alkan-415+Gossypol resin in a 4:1 ratio (denoted as G-1) and Alkan-415+MARZA-1 in a 7:1 ratio (denoted as G-2)) were prepared under laboratory conditions, and their demulsification and corrosion protection effects in an acidic environment were studied. The demulsification process was conducted at temperatures of 50 and 600C for two hours. During the examination of the demulsification efficiency of the compositions, it was observed that the effectiveness of the reagents increased with higher concentrations. At temperatures of 50 and 600C, the most significant effects were observed at a concentration of 700 g/t for both compositions. At these temperatures, the residual water content due to the effect of the G-1 composition was 0.02% and 0.01%, and for the G-2 composition, it was 0.01% and 0.005%, respectively. Furthermore, the corrosion protection efficiency of both G-1 and G-2 compositions in an acidic environment was investigated. During the experiment, the highest effectiveness was observed at a concentration of 700 g/t for both compositions. At this concentration, the corrosion protection effect of the G-1 composition was 96%, while that of the G-2 composition was 98%. Thus, it was determined that, due to their multifunctionality and significant impact both in the decomposition of stable water-oil emulsions and in acidic environments, the optimal consumption rates of both compositions with new content are 700 g/t. [ABSTRACT FROM AUTHOR]

The desalting and dehydration system in Baiji oil refinery uses a combination of methods including electrical, thermal, chemical, and physical methods. The salt content is within the range of 14–20 mg/L. The desalting efficiency rarely exceeds 75%, thus salt and water content exceed the Iraqi permissible limit. The purpose of the present work is to improve the performance of the Baiji oil refinery desalting unit without any major alteration of the field unit configuration. A laboratory scale unit is designed and constructed to investigate the desalting unit performance under various operating conditions. The results showed that under optimum operating parameters, the obtained desalting and dehydration efficiencies are 98.1% and 97.6%, respectively. The corresponding salt concentration and water content are 0.268 mg/L and 0.1 vol.%, respectively, which were within the acceptable Iraqi levels. [ABSTRACT FROM AUTHOR]

Heavy oil holds a pivotal position in the global energy landscape and plays a significant role in meeting the increasing energy demand worldwide. The utilization of multi-thermal fluids(comprising supercritical steam, CO2, and N2) in cyclic solvent injection (CSI) techniques overcomes the challenges associated with conventional steam flooding techniques such as high energy consumption, low heat utilization and poor performance, and becomes a promising technique for enhancing heavy oil recovery. However, the presence of surface-active substances in heavy oil and the complex composition of multi-thermal fluids leads to the formation of complex and stable emulsions during the cyclic multi-thermal fluids injection process, which poses challenges to subsequent demulsification. This study first elucidates the properties of heavy oil based on heavy oil component analysis, microscopic examination of asphaltene morphology and functional groups. Subsequently, the stability of emulsion generated during the cyclic multi-thermal fluids injection process is investigated based on water segmented ratio and particle size distribution of emulsion droplets. Furthermore, the stability mechanisms of emulsion are studied using scanning electron microscopy and infrared spectroscopy techniques. Finally, the effect of the polyether-type demulsifier on facilitating the dehydration of heavy oil emulsion is evaluated. The findings of this research provide theoretical insights to guide the development of efficient demulsifiers for cyclic multi-thermal fluid injection process. [ABSTRACT FROM AUTHOR]

Aluminum sulfate was used as a demulsifier to demulsify the lad-made emulsion of wire-drawing oil with different concentration. After demulsification，the COD，turbidity and pH value were measured，and the removal rate were calculated. Then，the demulsification effect of the aluminum sulfate alone and the composite demulsifier of aluminum sulfate-poly aluminum chloride were examined. The results show that the aluminum sulfate possesses the more stronger demulsification in several demulsifiers，the COD and turbidity in its treated water layer reached 70% and 60% respectively. However，the use of aluminum sulfate alone for the waste emulsion of wire-drawing oil of medium and high concentration from actual production showed poor performance，due to the emulsifying waste oil and water could not be layered. The composite demulsifier of aluminum sulfate and poly aluminum chloride，exhibited more effective demulsification on this waste. After stirring for 10 min，the removal rate of COD and turbidity of the medium concentration of waste emulsion reached 98% and 91% respectively，while 99% and 97% respectively for the waste of high concentration waste.

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this study, distilled water was used as a sustainable solvent for extracting oil from peanuts using a salt-aided microwave technique. Furthermore several critical parameters were considered to achieve an optimal oil yield result. The oil extraction yield was compared to that obtained by soxhlet (43%) with n-hexan. In aqueous salt-aided microwave extraction (ASME) method, NaCl and CaCl2 were considered to promote the oil-water demulsification. Accordance to the results, an oil extraction yield of 32.08% was obtained at optimum operating conditions including of the calcium chloride concentration of 0.4 M, water to sample ratio of 20 ml/g, leaching time of 120 min, microwave radiation time of 8 min and microwave power of 720 w. The GC analysis did not show significant differences between the fatty acids profile of the oil extracted through the ASME and the soxhlet extraction (SOXE) methods. In both the extraction methods oleic and linoleic acid were the dominant fatty acids in the peanut oil. Some of the physicochemical properties of the oil such as acid value, iodine value, peroxide value, density and refract index were considered that there were no considerable differences between the two methods, just the acid value of the extracted oil by the ASME method was slightly more than the SOXE method. Also, the research on the total phenolic content and antioxidant activity of the extracted oil showed slightly better results for the ASME method compared to the SOXE method. So the ASME method is a valid technique to obtain an extra green part of peanut oil to consume in the food industry.

Oil in water (O/W) and water in oil (W/O) crude oil emulsions have caused many production safety hazards and environmental problems, which have attracted widespread attention. In this article, an amphiphilic nano demulsifier ZIF-8@CNTs was prepared by solvothermal method based on the metal-organic frameworks (MOFs) and carbon nanotubes (CNTs). Scanning electron microscopy (SEM) and infrared spectroscopy (FT-IR) showed that ZIF-8@CNTs were grape dendritic, and ZIF-8 was successfully combined with OX-CNTs. Thermogravimetric analysis (TGA) showed that ZIF-8@CNTs had good thermal stability. The demulsification test showed that the demulsification rate could reach 99.4% when ZC-1 was added at 500 mg/L for 30 min at room temperature. The demulsification mechanism was studied by interfacial tension and interfacial activity experiments. [ABSTRACT FROM AUTHOR]

Water in heavy crude oil (W/O) emulsions, which are stubborn mixtures of immiscible heavy crude oil and brine, are a ubiquitous challenge in the petroleum industry. They cause serious corrosion problems, increase the viscosity of petroleum and make the production cost very high. This phenomenon appears during the production of crude oil and should be treated to maximize the overall profitability of oil production and meet transportation requirement. Surfactants are some of the most useful demulsifiers and play a pivotal role in breaking brine/oil emulsions. Herein, we aimed to combine ethyleneamine units and ethyleneoxide units to prepare star-shaped surfactants and test the effect of this combination on the demulsification performance. First, diethylenetriamine reacted with glycidyl 4-nonyl ether (GNE) through an epoxy ring opening to prepare trinonyl phenoxy diethylenetriamine (TNDT). Then, ethylene oxide units were introduced via the interaction of hydroxyl groups with 2-(2-chloroethoxy)ethanol to form ethoxylated trinonyl phenoxy diethylenetriamine (ETNDT). The chemical structures of the surfactants were verified via FTIR and NMR characteristic techniques. The surfactants were applied as demulsifiers for W/O emulsions. It was found that the introduction of the ethyleneoxide units enhanced the solubility of the water and the demulsification performance of the prepared surfactants. The demulsification efficiency was enhanced via ethoxylation and reached 100% for ETNDT for most of the W/O emulsions. [ABSTRACT FROM AUTHOR]

In the heavy petroleum industry, the development of efficient demulsifiers for the effective breaking of interfacially active asphaltenes (IAA)-stabilized water-in-heavy oil (W/HO) emulsions is a highly attractive but challenging goal. Herein, a novel nitrogen and oxygen containing demulsifier (JXGZ) with strong hydrogen bonding has been successfully synthesized through combining esterification, polymerization and amidation. Bottle tests indicated that JXGZ is effectual in quickly demulsifying the IAA-stabilized W/HO emulsions; complete dehydration (100%) to the emulsions could be achieved in 4 min at 55 °C using 400 ppm of JXGZ. In addition, the effects of demulsifier concentration, temperature and time on the demulsification performance of JXGZ are systematically analyzed. Demulsification mechanisms reveal that the excellent demulsification performance of JXGZ is attributed to the strong hydrogen bonding between JXGZ and water molecules (dual swords synergistic effect under hydrogen bond reconstruction). The interaction of the "dual swords synergistic effect" generated by two types of hydrogen bonds can quickly break the non-covalent interaction force (π-π stacking, Van der Waals force, hydrogen bonds) of IAA at the heavy oil–water interface, quickly promote the aggregation and coalescence of water molecules and finally achieve the demulsification of W/HO emulsions. These findings indicate that the JXGZ demulsifier shows engineering application prospects in the demulsification of heavy oil–water emulsions, and this work provides the key information for developing more efficient chemical demulsifiers suitable for large-scale industrial applications. [ABSTRACT FROM AUTHOR]

In this study, distilled water was used as a sustainable solvent for extracting oil from peanut using a salt-assisted microwave technique. In this regard, several critical parameters were considered to achieve an optimal oil yield result. The oil extraction yield was compared to that of obtained by soxhlet (43%) with n-hexan. In aqueous salt-assisted microwave extraction (ASME) method, NaCl and CaCl2 were considered to promote the oil-water demulsification. According to the results, an oil extraction yield of 32.08% was obtained at optimum operating conditions including the calcium chloride concentration of 0.4 M, water to sample ratio of 20 ml/g, leaching time of 120 min, microwave radiation time of 8 min and microwave power of 720 W. The GC analysis showed no significant differences between the fatty acids profile of the oil extracted through the ASME and the soxhlet extraction (SOXE) methods. In both extraction methods, oleic and linoleic acid were the dominant fatty acids in the peanut oil. Some of the physicochemical properties of the oil such as acid value, iodine value, peroxide value, density and refract index were considered that there were no considerable differences between the two methods, just the acid value of the extracted oil by the ASME method was slightly more than the SOXE method. In addition, the research on the total phenolic content and antioxidant activity of the extracted oil showed slightly better results for the ASME method compared to the SOXE method. Therefore, the ASME method is a valid technique to obtain an extra green part of peanut oil to consume in food industry. [ABSTRACT FROM AUTHOR]

Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas & Oil is the property of Editorial Department of Natural Gas & Oil and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Crude oil extraction is a hot topic concerning industrial applications. The extracted oil emulsions treatment with demulsifier is demanded for markets. Herein, we prepared a naturally based demulsifier comprising calcium phosphates from coralline materials. The XRD verifies successful formation of the intended calcium phosphate with characteristic peaks where the most intense peak at 30º for (211) plane matched well with card and former research. The SEM reveals the formation of the spherical, flowery shape. Zeta potential reaches −10 mV indicating reasonable stability of the demulsifier. For examining the separation efficiency using the bottle test, few drops of the demulsifer (~100 ppm) are enough for the separation at 55°C for 40 min in the water bath. Inherently, the separation initiates within few seconds. The extended results for the demulsifier are applied onto the ASH field (Borg Alarab, Egypt) and compared to other companies reports. The optimum separation efficiency for salt and water contents from crude oil reaches 9 PTB and 0.1%vol, respectively, after treatment by heating unit (Sigma package). The recommended values for these factors are 30 PTB and 2%vol. The efficiency of separation exceeds 99% for water and salt. This direction is significantly important for oil production and industry. [ABSTRACT FROM AUTHOR]

We studied the effect of individual reagents and new compositions on demulsification of stable water-oil emulsions produced from the wells of Muradkhanli and Balakhani fields, SOCAR. The corrosion protection effect of three new compositions designated as A, B and C in water-oil emulsion, as well as the effect of surface tension on freezing temperature are discussed in the article. Composition A contained the reagents ND-12 and Alkan, composition B contained reagents ND-12 and Gossypol resin, and composition C contained the reagents BAF, ND-12, Gossypol resin and Dissolvan-4411. Physical and chemical properties of the oil samples taken for the research were studied by known methods. The results of the obtained laboratory experiments gave reason to say that mainly one composition, B, has the highest demulsifying effect. In addition to the demulsifying effect of compositions A, B and C, the corrosion protection effect was also studied under laboratory conditions. In this regard, water-oil emulsion was used as an aggressive corrosion medium. The rate of corrosion was determined by gravimetric method in both reagent-free and reagent-containing mediums, and the corrosion protection effect of the compositions was calculated. Thus, the protection effect of composition B was 98.1% in Muradkhanli oil sample, and 97.8% in Balakhani oil sample. Moreover, the effect of all three newly prepared compositions on the surface tension and freezing temperature of the studied Muradkhanli and Balakhani oil samples were investigated. It was established that the composition C has the highest effect on the reduction of surface tension and freezing temperature of oil samples. [ABSTRACT FROM AUTHOR]

ABSTRACT: Introduction. This article describes the results of the destruction processes studies of stable emulsion suspension sludge systems, conducted by the authors. Destruction processes are achieved by adding nanoparticles to demulsifying compositions. Currently, there is no universal composition demulsifier that effectively destroys emulsions formed in oil sludges. Research methods. To deal with this issues, the authors have conducted research on the creation of an effective demulsifier containing nanosized particles of fullerenes. The studies were carried out with dispersed oil-slurry emulsion-suspension systems, selected from open storage ponds of enterprises of JSC «Tatoilgaz» and JSC «TAIF-NK». For the destruction of the oil-containing system of the emulsion-suspension type, a composite mixture of complex action has been developed, which includes anionic wetting agents, nonionic surfactants, flotation reagents, detergents and alkaline buffer solutions that provide the required value of a constant indicator of the acid-base balance of the aqueous medium. Results and its discussion. A composite demulsifying mixture of complex action, which increases the effectiveness of the wetting washing action of surfactants, namely, the diphilic structure of the dispersed medium changes to hydrophilic, that is, the contacts of particles having a monophilic surface with the hydrocarbon phase of the emulsion medium are broken. When particles pass into the water volume from the phase separation boundary, the layer on the surface of the emulsified water is destroyed. The dehydration time of petroleum products is reduced by almost 2 times. Conclusion. During the research, the intensification and increase of the efficiency have been successfully reached.

In this work, a multicomponent demulsifier package (named BDTXI) was developed for increasing the demulsification performance of the water-in-oil emulsions. Optimized demulsifier formulation consists of three active components (1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide, dodecyltriemthylammonium chloride, trioctylmethylammonium chloride), xylene, and isopropanol. A positive synergistic effect was observed among the active components of BDTXI. The concentrations of the components of the developed demulsifier package are determined based on obtaining the best synergistic effect. The demulsification efficiency of BDTXI was higher than commercial reagents at any concentration, water content, and temperature. The optimal concentration of BDTXI was 50 ppm, at which its demulsification effectiveness was more than 97%. The developed demulsifier package could adsorb at the oil-water interface, promote the colloidal dissolution of the emulsion layers, and form a hydrophilic surface characterized by a weak structural strength. The demulsification mechanism of BDTXI was based on minimizing the interfacial tension in order to be able to break the film and increase the frequency of droplet collisions. The change in the temperature and water content of the emulsions did not affect the demulsification performance of BDTXI. Moreover, the average reduction in the asphaltene flocculation parameter with the use of BDTXI and commercial reagents was about 19 and 11%. The results of the analysis of the backscattering light intensity, turbiscan stability index, zeta potential, and shear rate of the emulsions in the presence of various demulsifiers showed that BDTXI could separate the water in the emulsions more efficiently and faster than the commercial reagents. [ABSTRACT FROM AUTHOR]

Objective The aim is to solve the high energy consumption and carbon emission in the processing of oil-bearing drilling cuttings produced by an offshore drilling platform in Tianjin, which might bring secondary pollution to the environment and other difficult problems, and explore new ideas for realizing the development goal of carbon neutrality. Methods An efficient demulsifier was selected, and the demulsification and centrifugation combined treatment process were used to explore the removal efficiency of oil components in oil-bearing drilling cuttings. The optimum reaction conditions were determined by optimizing the design of orthogonal test. Results The best removal efficiency was observed with LB1025 demulsifier in the study. Further, the optimum reaction conditions were identified to be as follows: the effective concentration of demulsifier was 60%, the reaction temperature was 60 ℃, the stirring intensity was 700 r/min, the reaction time was 30 min, and the centrifugal speed was 5 000 r/min. Under the above conditions, the oil removal rate of oil-bearing drilling cuttings could achieve 96.77%, while athe residual oil rate was 0.21%, which could meet the emission standard of Grade B in GB 4284-2018 Control standard of pollutant in sludge for agricultural use. Conclusions Demulsification and centrifugation process can effectively reduce the oil content of oil-bearing drilling cuttings, and provide technical reference for efficient, energy-saving and environmental treatment of oil-bearing drilling cuttings in realizing the development goal of carbon neutrality. [ABSTRACT FROM AUTHOR]

The block polyether demulsifier prepared by ring‐opening polymerization of ethylene oxide and propylene oxide under high temperature and high pressure is the most widely used demulsifier for water in crude oil emulsion. It has the high synthesis risk and cost. Therefore, the development of non‐block polyether demulsifier has attracted more and more attention. In this article, a new type of demulsifier was sythesized by radical polymerization of acrylate and cationic monomer. It was found that the copolymer PMA‐co‐PDBC of methyl acrylate (MA) and benzyldimethyl [2‐[(1‐oxoallyl)oxy] ethyl] ammonium chloride (DBC) synthesized in the mixed solvent of dipropylene glycol methyl ether and water had a good performance. When dosage of PMA‐co‐PDBC was 200 mg/L, the dehydration rate of water in crude oil emulsion with 50% water content can reach 80% at 80°C within 4 h. Structural and interface properties analysis presented that PMA‐co‐PDBC had a microblock structure similar with block polyether and it can effectively reduce the strength of W/O interfacial film to realize the demulsification. Although the demulsification performance of PMA‐co‐PDBC was not better than block polyether, its preparation safety and cost are much better. The results of this article can provide a new option for the development of crude oil demulsifier. [ABSTRACT FROM AUTHOR]

Produced water, also known as oily wastewater, is one of the major wastes in the oil and gas industry. During the hydrocarbon production, formation of emulsion takes place such as oil-in-water emulsion which has a huge financial effect on the sector. Oil and gas industry seeks highly effective and reasonable demulsifying chemicals to separate the oil-in-water emulsions into water and crude oil. Thus, in this publication, resin alkoxylate, cationic polyamine, cationic surfactant and ethylene oxide/propylene oxide (EO/PO) block copolymers are utilized to resolve the oil-in-water emulsion from a gas condensate field. According to the findings of preliminary screening, a unique demulsifier DB was formulated by incorporating resin alkoxylate and cationic surfactant at an optimal weight percentage ratio. Demulsification efficiency (De) of 96 % based on measurement of turbidity was attained after treating the oil-in-water (O/W) emulsion with demulsifier DB at a dosage of 7 ppm. To determine the demulsifier's efficiency further, the oil-in-water content (OiW) of the produced water was evaluated after the treatment with demulsifier DB. Oil removal efficiency (ORe) of 90% was achieved as the formulated demulsifier DB reduced the oil-in-water content (OiW) of O/W emulsion from 1008.3 ppm to 97.1 ppm within 15 minutes at the dosage of 7 ppm. Furthermore, interfacial tension (IFT) and Turbiscan analysis were performed to further study the demulsification process of blank sample and the addition of the demulsifier DB at the optimized dosage of 7 ppm. At demulsifier DB dosage of 7 ppm, the interfacial tension between oil and water reduced significantly compared to blank sample from 24.98 mN/m to 9.38 mN/m. The produced water sample after treatment with 7 ppm of demulsifier DB resulted in a significant increase of Turbiscan Stability Index (TSI) value of 8 which indicates the rate at which the separation of oil and water occurred. The attained results of IFT and Turbiscan analysis further validate that mixed surfactant system is more efficient than single surfactant system. By combining surfactants with different functional groups, mixed surfactant systems can exhibit greater surface activity than single surfactants.

For the first time, the relationship between the efficiency of dehydration and the value of reducing the viscosity of the coal tar by adding demulsifier has been studied for “water in tar” emulsions. The dewatering of coal tar emulsions was investigated using 12 demulsifiers with different relative water solubility indices (RSN = 8.2–14.5) for tars of different pyrolysis grades. The effect of a series of demulsifiers on the viscosity of the dispersion medium of “waterin- tar” emulsions was studied. A low-pyrolysis tar was taken as a model of dispersion medium of emulsions with 1.2 % moisture content and 1.0 % of quinoline insoluble substances. A bottle test was used for a comparative evaluation of the demulsifying activity. The rheological characteristics of the studied tars were determined with a rotational controlled-shear rate rheometer Brookfield DV2T in a temperature range between 30 and 65 °C. When demulsifiers were added to the tar and the mixture was aged for 24 h, a decrease in viscosity was observed. When measured without withstanding, the viscosity of the mixture decreases in some cases only at a sufficiently high heating temperature (58 °C). The comparison of the dewatering efficiency with the mixture viscosity at 58 °C shows a linear dependence: the more the tar viscosity decreases when the demulsifier is added, the higher the dewatering efficiency when using this demulsifier for tars of different pyrolytic degree. Decreasing the viscosity of the tar promotes the coalescence of water drops and the diffusion rate of the demulsifier through the dispersion medium to the water-tar interface, which increases the efficiency of dewatering. The selectivity of tar dehydration by the studied demulsifiers is preserved for both low- and high-pyrolyzed coal tars. In the area of low viscosity reduction of the dispersion medium, the role of RSN is considerably higher, and an increase in the hydrophilicity of the reagent contributes to better dehydration. This may be due to the increased wetting ability of demulsifiers concerning emulsion stabilizers. [ABSTRACT FROM AUTHOR]

The article characterizes the degree of the impact of individual reagents and compositions on stable water-oil emulsions obtained from the wells of «SOCAR» (Republic of Azerbaijan) such as Muradkhanli, Bulla-deniz, Balakhani, Neft dashlari and Surakhani fields. The article reports the results of the corrosion protection effect of A2 composition in hydrogen sulfide formation water. Physicochemical properties of the oil samples taken for the research were studied by the known methods. The method of «bottle test» was used to carry out the deemulsification process in laboratory conditions. Experiments were conducted at temperatures of 20, 30, 40, and 500C in order to study the impact of reagents on the deemulsification of the mentioned emulsion oils. Compositions of ND-12, Gossypol, Disulfan-4411, Alkan reagents, compositions with 1:1:1:1 ratio of Dissolvan-4411, Alkan, ND-12 and Gossypol resin reagents (A1) and 3:1 ratio of ND-12 and Gossypol resin reagents (A2) were used as demulsifiers. The results of the obtained laboratory experiments showed that the composition of A2 has the highest demulsifying effect. Along with demulsifying effect of gossypol resin based A2 composition, the corrosion protection effect was also studied under laboratory conditions. For this purpose, hydrogen sulfide formation water was used as an aggressive corrosion environment. Corrosion rate was determined by gravimetric method both in reagent-free and reagent based environments, and corrosion protection effect of the composition was calculated. It was found that Gossypol resinbased A2 composition also shows high corrosion protection effectiveness. Thus, this effectiveness is 98% at the concentration of 800 g/t of the composition. The use of the composition prepared on the basis of ND-12 and Gossypol resin produced in Azerbaijan at the same time in the decomposition of stable water-oil emulsions of heavy oils and also in the protection of the internal surface of transport preparation facilities from electrochemical corrosion can be considered appropriate both from the economic and ecological point of view. [ABSTRACT FROM AUTHOR]

[Display omitted] • Facile method was used to prepare multifunctional zwitterionic surfactants. • Surfactants were applied for demulsification of Arabian crude oil emulsions. • The effect of sulfone functionalization on the demulsification process was studied. • Multifunctional zwitterionic surfactants showed high and fast demulsification efficiency. We report an easy process to prepare new anionic and zwitterionic surfactants to break water in Arabian heavy crude oil emulsions (W/O) with different compositions (10/90, 30/70 and 50/50 vol%). Surfactants were prepared in only two stages using simple methodology. Diethylenetriamine was interacted with three moles of glycidyl 4-nonyl ether followed by the interaction with 3 and 8 mol of 1,3-propanesultone to yield TNDTS-3 and TNDTS-8 respectively. FTIR and NMR spectroscopies were carried out to substantiate the chemical structures of surfactants. Relative solubility number (RSN), surface activity and solubility properties were determined. Demulsification efficiencies and interfacial tension (IFT) of the prepared surfactants were investigated. Our findings demonstrated that increasing propyl sulfonate groups in the surfactant structure improved water solubility, IFT activity and demulsification efficiency. TNDTS-8 achieved 100 % demulsification activities in all W/O emulsions (10/90, 30/70 and 50/50 vol%). [ABSTRACT FROM AUTHOR]

[Display omitted] • M−MEA was prepared by a simple two-step reaction. • Demulsification efficiency of 100% could be achieved in various emulsions. • M−MEA exhibits a clover-shaped structure with a hydrophilic core and twelve hydrophobic chains. A clover-shaped demulsifier (M−MEA) was synthesized via a simple two-step reaction, and its chemical structure was corroborated using 1H NMR and FT-IR. The demulsification efficacy of M−MEA was investigated on two distinct water-in-oil emulsions. The bottle test results indicated that in a W/O emulsion with 30 % oil content, M−MEA achieved a demulsification efficiency (DE) of 100 % at a concentration of 300 mg/L, temperature of 60 °C, and settling time of 120 min. Similarly, in a W/O emulsion with 70 % oil content, the DE also reached 100 % at a concentration of 500 mg/L and a settling time of 90 min. Moreover, M−MEA exhibited remarkable demulsification performance at high salinity and across a wide pH range. Comparative analysis with other commercially available demulsifiers revealed that M−MEA offered high demulsification efficiency and yielded a clearly separated water phase. The study delved into the demulsification mechanism through assessments of dynamic interfacial tension (IFT), surface tension (ST), three-phase contact angle (TCA), and zeta potential. The findings demonstrated that M−MEA, acting as an effective demulsifier, swiftly migrated to the oil–water interface, displaced the natural surfactant, and destabilized the emulsion, thereby facilitating the oil–water separation of emulsions. [ABSTRACT FROM AUTHOR]

In the heavy petroleum industry, the development of efficient demulsifiers for the effective breaking of interfacially active asphaltenes (IAA)-stabilized water-in-heavy oil (W/HO) emulsions is a highly attractive but challenging goal. Herein, a novel nitrogen and oxygen containing demulsifier (JXGZ) with strong hydrogen bonding has been successfully synthesized through combining esterification, polymerization and amidation. Bottle tests indicated that JXGZ is effectual in quickly demulsifying the IAA-stabilized W/HO emulsions; complete dehydration (100%) to the emulsions could be achieved in 4 min at 55 °C using 400 ppm of JXGZ. In addition, the effects of demulsifier concentration, temperature and time on the demulsification performance of JXGZ are systematically analyzed. Demulsification mechanisms reveal that the excellent demulsification performance of JXGZ is attributed to the strong hydrogen bonding between JXGZ and water molecules (dual swords synergistic effect under hydrogen bond reconstruction). The interaction of the “dual swords synergistic effect” generated by two types of hydrogen bonds can quickly break the non-covalent interaction force (π-π stacking, Van der Waals force, hydrogen bonds) of IAA at the heavy oil–water interface, quickly promote the aggregation and coalescence of water molecules and finally achieve the demulsification of W/HO emulsions. These findings indicate that the JXGZ demulsifier shows engineering application prospects in the demulsification of heavy oil–water emulsions, and this work provides the key information for developing more efficient chemical demulsifiers suitable for large-scale industrial applications.

In this study, a carbon‐based nanodemulsifier (ZIF‐8@CNS) was prepared in order to lessen the harmful effects of crude oil emulsion on mechanical equipment and the environment and to provide a green and efficient demulsifier. A novel hydrophilic/lipophilic carbon‐based nanodemulsifier ZIF‐8@CNS was prepared by solvothermal method using ZIF‐8 and carbon nanospheres (CNS) as raw materials. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT‐IR) showed that ZIF‐8@CNS was successfully compounded. The interfacial activity experiment showed that the carbon nanospheres combined with ZIF‐8 had better hydrophilic and lipophilic balance and were more easily distributed at the oil‐water interface. The demulsification experiment of water‐in‐toluene emulsion with water content of 1 % was carried out. The results showed that when the dosage of ZIF‐8@CNS with 10 % carbon content was 300 mg/L, the residual water content in the emulsion oil phase was only 0.09 % within 15 min at room temperature. In addition, we propose a possible demulsification mechanism of the demulsifier. ZIF‐8@CNS is environmentally friendly and an effective oil‐water phase separation material with broad application prospects. [ABSTRACT FROM AUTHOR]

PT Champion Kurnia Djaja Technologies' role is to produce oil field chemical products on a large scale and then used in applications in the petroleum industry. Petroleum is a fuel derived from fossils. Microorganisms living in the ocean. When these organisms die, their remains will settle to the bottom of the ocean and be covered in mud. Demulsifier or oil field is one of the specific chemicals to separate emulsions for example a mixture of water, petroleum. Product selection is done to analyze the quality of crude oil. The method used for analysis is the bottle test demulsifier in the laboratory by entering 40% water and 60% oil into saniglass and allowed to stand in the water bath and then injected with the chemical that has been observed, then 15, 30, 45, 60 minutes with Note the changes in the water drop, interface, and clarity of each sample, if not optimal, phase 2 testing will be carried out with the bottle test method and get the optimal West Benakat sample results by injecting chemical 1 + 3 the results are sharp interfaces, clear clarity and The BS&W is dry oil, while the Talang Akar sample is optimal in chemical 2 + 3 because the interface is sharp, the clarity is clear and the BS&W is dry oil. [ABSTRACT FROM AUTHOR]

Based on the excellent adsorption of metal orgaic framework (MOFs) and carbon nanomaterials (CNTs), an amphiphilic nano-demulsifier ZIF-8@CNTs was prepared from ZIF-8 and OX-CNTs by solvothermal method, and its demulsification test was carried out. The demulsifier was characterized by SEM, FTIR and TGA. The results show that the composite material ZIF-8@CNTs is grape-shaped, that the demulsification efficiency of ZC-1 can reach 99.4% at room temperature with the addition of 500 mg/L for 30 min. ZIF-8@CNTs has good demulsification performance. OX-CNTs and ZIF-8 have synergistic demulsification effect. The combination of the two materials improved the demulsification ability of ZIF-8@CNTs. [ABSTRACT FROM AUTHOR]

The effect of ultrasonic treatment on the preparation of high-viscosity oils was studied in this article. The effect of frequency, time of ultrasonic action on changes in the content of residual water, changes in the content of residual chloride salts of oil-water emulsions was investigated. The conducted studies have shown that the applying ultrasonic action in the destruction of stable oil-water emulsions obtained from the oil loading estacode of the investigated oil refining units improves the quality of oil preparation for industrial processing and the production of oils that meet the requirements of the O'z DST 3032: 2015 standard. Moreover, it was found that for the studied oil-water emulsions it is enough to carry out the destruction until the radiation intensity U = 15 W/cm², further increase of the latter practically does not change the achieved level of the quality of the oils. [ABSTRACT FROM AUTHOR]

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The hydrophobic "palm" was stable in the continuous oil phase, and the hydrophilic "fingers" could attract dispersed water droplets to aggregate, facilitating demulsification. [Display omitted] • Design and preparation of demulsifiers based on molecular dynamics simulation. • Propose a "hand-shaped" demulsification mechanism model. • Block isomers and molecular size were the key factors affecting demulsification. • The development of new demulsifiers can be significantly expedited by combining MDS and experiment. Demulsifiers are crucial for enhancing crude oil extraction and transportation efficiency by facilitating the separation of oil–water emulsions. However, research conducted on the design and synthesis of demulsifiers based on the results of molecular dynamics simulation remains scarce. Herein, we designed eight block polyethers, and explored their interfacial behaviors at the oil–water interface via molecular dynamics simulation. Correspondingly, eight block polyether demulsifiers were synthesized, and their interface properties were tested. The simulation results were consistent with the experimental results, indicating that the energy of simulation systems could be efficiently reduced by designed molecules, and that the prepared demulsifiers with the same structure could achieve effective demulsification correspondingly. Based on the simulation and experimental results, a "hand-shaped" demulsification mechanism model was proposed. The demulsifiers with hydrophobic "palm" and hydrophilic "fingers" demonstrated a more efficient performance in demulsification. The hydrophobic "palm" was stable in the continuous oil phase, and the hydrophilic "fingers" could attract dispersed water droplets to aggregate, facilitating demulsification. The study also finds that longer hydrophilic "fingers" exert stronger molecular force. Combining molecular dynamics simulation and experiment significantly accelerates the development of new demulsifiers, highlighting the utility of this approach in the research on demulsifiers. [ABSTRACT FROM AUTHOR]