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The FCC unit is closely related to its upstream and downstream units, especially for single series refineries, the change of the working condition of the upstream unit will have a significant impact on the production and operation of the downstream unit. During the catalyst replacement period of the residue hydrogenation unit, the FCC unit blended vacuum residue, resulting in severe deterioration of the properties of the FCC feedstock. The increase in vanadium content in the feedstock led to a decrease in the activity of the equilibrium catalyst and an increase in the olefin content of the FCC gasoline, causing rapid coking of heat exchanger group E101 in the S Zorb unit and affecting its operation. Therefore, during the catalyst replacement period of the residue hydrogenation unit, it is recommended to purchase light paraffin-base crude oil with low sulfur and metal content in advance, in order to alleviate the vanadium poisoning of the FCC unit catalyst; try to increase the catalyst consumption of the FCC unit to over 2.0 kg/t to prevent excessive vanadium content of the equilibrium catalyst; if E101 is rapidly coking and has caused excessive pressure drop, chemical cleaning can be used to clean the coking in the E101 tube pass. [ABSTRACT FROM AUTHOR]

Copyright of Urban Geology is the property of Urban Geology 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 Corrosion & Protection in Petrochemical Industry is the property of Corrosion & Protection in Petrochemical Industry 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.)

From the perspective of resource recovery, this paper summarized the physical and chemical method ( evaporation method, the remove method, adsorption, membrane separation, magnesium ammonium phosphate precipitation) and recycling organic waste anaerobic biological method and other methods in the fermented liquid ammonia nitrogen form and its mechanism, analyses the anaerobic fermentation liquor pH, temperature, gas liquid ratio and suspended solids and organic matter, high concentration of ammonia nitrogen on the effects of the ammonia nitrogen recycling in view of the existing in the running cost is high, the adsorption capacity is small, membrane fouling and concentration ability is limited and difficult problems such as separation, puts forward the delve into a stable and efficient, low cost, convenient operation, nitrogen recovery technology and combination of the process and optimize the process conditions of research direction, in order to organic waste anaerobic fermentation contained ammonia nitrogen utilization to provide the reference. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology 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 Electroplating & Finishing is the property of Electroplating & Finishing 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.)

The effects on structure, morphology, composition and characteristics of reverse osmosis membrane fouling were investigated by an effluent with different Ca/Al ratios of membrane bioreactor in a biopharmaceutical enterprise. The results demonstrated that calcium and aluminum combined with organic matter formed a composite fouling layer on the membrane surface, and the change of Ca/Al ratio resulted in significantly different membrane fouling characteristics. The form of Al-O-H in the solution was preferentially combined with the organic functional groups by polar force, and it was co-deposited with the coagulation of the hydrophobic organic components under the condition of low aluminum content and high Ca/Al ratio. It had a far greater effect on the formation of membrane fouling than the Ca component. According to the extended Young's equation, the total surface tension of the system was calculated as:53.0 mJ/m² (low Ca low Al),69.5 mJ/m² (low Ca high Al),70.4 mJ/m² (high Ca high Al).It showed that the change of aluminum content mainly affected the polar force between the solution and the membrane material, and the change of the calcium content had almost no corresponding effect The results of membrane cleaning indicated that the membrane fouling caused by calcium-aluminum components were stratified in spatial structure,and aluminum was tightly bound to the bottom layer of membrane fouling by the polar force between the molecules on the membrane surface, forming irreversible fouling. Calcium mainly existed in the contaminated filter cake layer which can be easily recovered by chemical cleaning. Therefore, it is of great significance to accurately control the dosage of aluminum salt in the coagulation pretreatment stage to prevent membrane fouling. [ABSTRACT FROM AUTHOR]

Copyright of Petroleum Refinery Engineering is the property of Petroleum Refinery Engineering 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 Electroplating & Finishing is the property of Electroplating & Finishing 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.)

Chemical stability of ion exchange membranes ( IEMs) in sodium hypochlorite ( NaC10) solu-tion was investigated by membrane aging experiments. The result showed that after soaking in 0.1% Na-C10 solution for 60 d, the water content of the heterogenous IEMs increased while ion exchange capacity and membrane resistance decreased. The contact angle of anion exchange membrane ( AEM) and cation exchange membrane ( CEM) decreased to 97°and 110° respectively. The analysis of scanning electron mi-croscopy ( SEM), Fourier transform infrared ( FTIR) spectrometer, thermogravimetry, and tensile strength indicated that the membrane structure degraded, thermal stability decreased, and the material of membrane changed from rigid to brittle. NaC10 Resulted in the degradation of quaternary ammonium groups on the AEMs, and the polyethylene chain of both AEM and CEM was broken due to the oxidation of free radical, which changed the structure and properties of the membranes. [ABSTRACT FROM AUTHOR]

Copyright of Advances in New & Renewable Energy is the property of Editorial Office of Advances in New & Renewable Energy 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 China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher 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 Journal of Petrochemical Universities / Shiyou Huagong Gaodeng Xuexiao Xuebao is the property of Journal Editorial Department Of Liaoning Shihua University 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 Petroleum Refinery Engineering is the property of Petroleum Refinery Engineering 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 China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS 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.)

Problems occurred in the operation of reverse osmosis membrane unit in the zero discharge system of coal chemical wastewater treatment, which shortened the replacement period of the security filter element and the cleaning period of reverse osmosis membrane, which seriously affected the operation of the whole device. Through process parameter investigation, water quality analysis, scanning electron microscope on pollutants, pollutants composition analysis; after investigating the pretreatment device and adjusting the type and amount of agents, the off-line cleaning flux of reverse osmosis membrane was restored to more than 98%,the service cycle of the security filter element was restored to 1.5～2 months, and the cleaning cycle of reverse osmosis device was also restored to the design value to achieve better results. [ABSTRACT FROM AUTHOR]

The CuFe2O4 spinel ferrite catalyst was prepared by sol-gel method, and Fe-Cu catalyst was characterized and analyzed by XRD,BET,SEM etc. CuFe2O4spinel ferrite catalyst was used for catalytic wet oxidation of coal chemical wastewater membrane concentrate. The results showed that the COD and UV254（phenolic compounds） removal efficiency of coal chemical wastewater membrane concentrates reached 87.3% and 97.1%,respectively, after 60 min of reaction, under the condition of initial pH=3,hydrogen peroxide dosage of 5 mL/L, the reaction temperature of 160 ℃ reaction pressure of 1.5 MPa, and catalyst dosage of 1.2 g/L. [ABSTRACT FROM AUTHOR]

The rotary crossflow membrane separation technology was applied to the treatment of stone wastewater. The operation performance, operation status, anti blocking and anti pollution ability of the membrane separation equipment were studied. The results show that when the rotary crossflow ultrafiltration equipment was applied to the treatment of stone mining wastewater, the effluent flow rate could be more than 2.5m3/h for a long time. The operating pressure could be maintained at a low pressure level of less than 0.04MPa, in which the removal rate of suspended solids was 99.5%, the removal rate of turbidity was 100%, and the effluent CODcr concentration was about 15mg/L, which met the reuse standard of the plant. Compared with the traditional membrane equipment, it only needed periodic maintenance cleaning, basically did not need chemical cleaning, and had good anti pollution performance. The energy consumption of operation treatment only accounted for about 30% of the conventional aeration membrane equipment, and the energy-saving benefit was remarkable. The industrial application and popularization had a good prospect. [ABSTRACT FROM AUTHOR]

Copyright of Electroplating & Finishing is the property of Electroplating & Finishing 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.)

As a type of polymeric membrane with excellent comprehensive performance, polyether sulfone (PES) membrane is widely applied in many fields, including blood purification and water treatment fields. However, there are still some drawbacks exist during the current application of PES membranes: the main disadvantage is related to its relatively hydrophobic character. Membrane fouling is directly related to the hydrophobicity, which is caused by adsorption of nonpolar solutes, hydrophobic particles or bacteria. Meanwhile, when contacting with blood, proteins will rapidly adsorb onto the surface of the PES membrane and the adsorbed protein layer may lead to further undesirable results, such as platelet adhesion, aggregation and coagulation. As the consequence, the antifouling property and blood compatibility of PES membranes need to be improved. In addition, PES membrane is stable in water. Being an inert membrane, PES membrane acts only as a barrier in the separation process. Thus, the performances of PES membrane would be weakened upon unavoidable membrane fouling, and they cannot be applied in cases where self-regulated permeability and selectivity are required. As a result, smart PES membrane which can self-regulate their permeability and selectivity via the flexible adjustment of pore sizes and surface properties also needs to be developed. With the aim of achieving these purposes, endowing the PES membranes with special functions by various modification methods has aroused more and more attention. In this review, the widely used modification methods for functionalized PES membranes were briefly introduced. Meanwhile, the recent studies of design and fabrication of PES membranes with various functions were summarized, including: (1) the anticoagulation, antifouling and antibacterial membranes for blood purification and biomedical engineering; (2) the stimuli-responsive membranes with switchable permeability and selectivity; (3) the modified membranes with improved adsorption performance for wastewater treatment. Finally, we give the future perspective of the research and development directions of the functionalized PES membranes. [ABSTRACT FROM AUTHOR]

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher 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 Petroleum Refinery Engineering is the property of Petroleum Refinery Engineering 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 Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology 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 China Surfactant Detergent & Cosmetics (1001-1803) 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.)

The MDEA rich-poor liquid heat exchangers used in the natural gas purification plant of Sichuan and Chongqing gas field are mostly fully closed stainless steel plate ones. The internal fouling are serious after operation, resulting in the decrease of heat exchange efficiency, which seriously affects the safe and stable operation of the device. A kind of efficient chemical cleaner suitable for stainless steel plate heat exchanger was selected according to the scale type, composition, equipment structure and material of the MDEA liquid heat exchanger, and the field application was conducted in a gas purification plant. The experimental results showed that the temperature difference between the inlet and outlet of the heat exchanger increased by more than 5 ℃ after the chemical cleaning, indicating the great improvement of the heat transfer efficiency. At the same time, the corrosion rate of the clean heat exchanger material was only 0.047 6 (g/m2·h), which fully met the requirements of the chemical cleaning. [ABSTRACT FROM AUTHOR]

Copyright of Petroleum Refinery Engineering is the property of Petroleum Refinery Engineering 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 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.)

Aiming at the applicability of the chemical cleaning method to the second loop of the nuclear power plant, the test method was used to study the chemical cleaning of the loop pipeline belongs to the second loop of CPR1000 nuclear power plant. Through static rotary coupon method test, dynamic flushing test, passivation and corrosion prevention test, five cleaning reagent and three passivator were tested with 20# carbon steel, 304 stainless steel pipe and the corresponding standard test piece, and the comprehensive cleaning effect anti-corrosion ability after cleaning was got by above-mentioned test. The test effect of each cleaning reagent was analyzed by the data got from the test, and the better chemical cleaning agent is given relatively by comprehensive contrast to the cleaning and anti-corrosion ability; on the basis of static test, the dynamic test is carried out to simulate the actual flushing effect, and matching performance with the result of static test can also be got. Beyond that, the chemistry residual of the system after cleaning was measured, and the assessment of the chemistry residual was got with it. The results indicate that the chemical cleaning method is suitable for CPR1000 Nuclear power unit, EDTA is a relatively better chemical cleaning agent by comprehensive contrast to the cleaning and anti-corrosion ability. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology 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.)