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The food processing sector has expanded dramatically over the past ten years, particularly with regard to goods that are high in biologically active compounds. Thus, the efficacy and safety of food extraction techniques have also received attention. There is currently a sharp rise in research articles committed to the creation of new extraction techniques which are not only quick and affordable but also more effective and environmentally friendly, increasing yields and extract quality without the use of potentially dangerous organic solvents. The use of green solvents has been a focus of study to meet sustainable development goals. Deep eutectic solvents (DESs) are acknowledged as excellent alternatives to organic solvents due to their simpler manufacturing procedure with 100% atom economy, cheap cost, probable biodegradability, and negligible toxicity. DESs have become a popular and useful liquid with proven application in a variety of chemical reactions. Wide variety of food components may be extracted using DES, and they have been shown to be useful for applications involving food. However, the possibility for industrial scale-up use, however, has not been fully examined.

“Affordable and clean energy” is enshrined in the UN Sustainable Development Goals (SDGs; #7) because of its importance in supporting the sustainable development of society. As an energy source, coal is widely used because it is abundant and its utilization for electricity and heat generation do not require complex infrastructures and technologies, which makes it ideal for the energy needs of low-income and developing countries. Coal is also essential in steel making (as coke) and cement production and will continue to be on high demand for the foreseeable future. However, coal is naturally found with impurities or gangue minerals like pyrite and quartz that could create by-products (e.g., ash) and various pollutants (e.g., CO2, NOX, SOX). To reduce the environmental impacts of coal during combustion, coal cleaning—a kind of pre-combustion clean coal technology—is essential. Gravity separation, a technique that separates particles based on their differences in density, is widely used in coal cleaning due to the simplicity of its operation, low cost, and high efficiency. In this paper, recent studies (from 2011 to 2020) related to gravity separation for coal cleaning were systematically reviewed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A total of 1864 articles were screened after removing duplicates, and after a thorough evaluation 189 articles were reviewed and summarized. Among of conventional separation techniques, dense medium separator (DMS), particularly dense medium cyclone (DMC), is the most popular technologies studied, which could be attributed to the growing challenges of cleaning/processing fine coal-bearing materials. In recent years, most of works focused on the development of dry-type gravity technologies for coal cleaning. Finally, gravity separation challenges and future applications to address problems in environmental pollution and mitigation, waste recycling and reprocessing, circular economy, and mineral processing are discussed.

Abstract The intelligent choice of extractants and entrainers can improve current mixture separation techniques allowing better efficiency and sustainability of chemical processes that are both used in industry and laboratory practice. The most promising approach is a straightforward comparison of selectivity at infinite dilution between potential candidates. However, selectivity at infinite dilution values are rarely available for most compounds so a theoretical estimation is highly desired. In this study, we suggest a Quantitative Structure–Property Relationship (QSPR) approach to the modelling of the selectivity at infinite dilution of ionic liquids. Additionally, auxiliary models were developed to overcome the potential bias from big activity coefficient at infinite dilution from the solute. Data from SelinfDB database was used as training and internal validation sets in QSPR model development. External validation was done with the data from literature. The selection of the best models was done using decision functions that aim to diminish bias in prediction of the data points associated with the underrepresented ionic liquids or extreme temperatures. The best models were used for the virtual screening for potential azeotrope breakers of aniline + n-dodecane mixture. The subject of screening was a combinatorial library of ionic liquids, created based on the previously unused combinations of cations and anions from SelinfDB and the test set extractants. Both selectivity at infinite dilution and auxiliary models show good performance in the validation. Our models’ predictions were compared to the ones of the COSMO-RS, where applicable, displaying smaller prediction error. The best ionic liquid to extract aniline from n-dodecane was suggested.

In an era where it becomes less and less accepted to just send waste to landfills and release wastewater into the environment without treatment, numerous initiatives are pursued to facilitate chemical production from waste. This includes microbial conversions of waste in digesters, and with this type of approach, a variety of chemicals can be produced. Typical for digestion systems is that the products are present only in (very) dilute amounts. For such productions to be technically and economically interesting to pursue, it is of key importance that effective product recovery strategies are being developed. In this review, we focus on the recovery of biologically produced carboxylic acids, including volatile fatty acids (VFAs), medium-chain carboxylic acids (MCCAs), long-chain dicarboxylic acids (LCDAs) being directly produced by microorganisms, and indirectly produced unsaturated short-chain acids (USCA), as well as polymers. Key recovery techniques for carboxylic acids in solution include liquid-liquid extraction, adsorption, and membrane separations. The route toward USCA is discussed, including their production by thermal treatment of intracellular polyhydroxyalkanoates (PHA) polymers and the downstream separations. Polymers included in this review are extracellular polymeric substances (EPS). Strategies for fractionation of the different fractions of EPS are discussed, aiming at the valorization of both polysaccharides and proteins. It is concluded that several separation strategies have the potential to further develop the wastewater valorization chains.

Ionic liquids (ILs) have been applied in different areas of separation, such as ionic liquid supported membranes, as mobile phase additives and surface-bonded stationary phases in chromatography separations and as the extraction solvent in sample preparations, because they can be composed from various cations and anions that change the properties and phase behavior of liquids. Although the applications of ILs in separations are still in their early stages, the academic interest in ILs is increasing. An overview of the principle applications of ILs in separation technology is present in this work. Furthermore, the prospects of the ILs in separation techniques are discussed.

Son yıllarda atıksuların arıtılmasının yanında, kaynakta atık maddeleri geri kazanma işlemleri üzerinde önemle durulmaya başlanmıştır. Özellikle batılı ülkelerde çevre koruma tedbirleri yoğunlaştırılarak ağır metalller gibi tehlikeli maddelerin geri kazanımında yarıgeçirgen membranların kullanılmasında önemli gelişmeler olmuştur. Ultrafiltrasyon, mikrofiltrasyon, elektrodiyaliz gibi polimerik membran sistemlerle birlikte sıvı membranlar ile de atıksu arıtımı gerçekleştirilmektedir. Aynı zamanda sıvı membranlar hidrometalurjide metal iyonlarının ayrılmasında da kullanılmaktadır. Sıvı membranlar biyoteknolojide, medikal alanlarda, gaz ayırma işlemlerinde kullanım alanlarına sahiptir.

Son yıllarda atıksuların arıtılmasının yanında, kaynakta atık maddeleri geri kazanma işlemleri üzerinde önemle durulmaya başlanmıştır. Özellikle batılı ülkelerde çevre koruma tedbirleri yoğunlaştırılarak ağır metalller gibi tehlikeli maddelerin geri kazanımında yarıgeçirgen membranların kullanılmasında önemli gelişmeler olmuştur. Ultrafiltrasyon, mikrofiltrasyon, elektrodiyaliz gibi polimerik membran sistemlerle birlikte sıvı membranlar ile de atıksu arıtımı gerçekleştirilmektedir. Aynı zamanda sıvı membranlar hidrometalurjide metal iyonlarının ayrılmasında da kullanılmaktadır. Sıvı membranlar biyoteknolojide, medikal alanlarda, gaz ayırma işlemlerinde kullanım alanlarına sahiptir.

Son yıllarda atıksuların arıtılmasının yanında, kaynakta atık maddeleri geri kazanma işlemleri üzerinde önemle durulmaya başlanmıştır. Özellikle batılı ülkelerde çevre koruma tedbirleri yoğunlaştırılarak ağır metalller gibi tehlikeli maddelerin geri kazanımında yarıgeçirgen membranların kullanılmasında önemli gelişmeler olmuştur. Ultrafiltrasyon, mikrofiltrasyon, elektrodiyaliz gibi polimerik membran sistemlerle birlikte sıvı membranlar ile de atıksu arıtımı gerçekleştirilmektedir. Aynı zamanda sıvı membranlar hidrometalurjide metal iyonlarının ayrılmasında da kullanılmaktadır. Sıvı membranlar biyoteknolojide, medikal alanlarda, gaz ayırma işlemlerinde kullanım alanlarına sahiptir.

Son yıllarda atıksuların arıtılmasının yanında, kaynakta atık maddeleri geri kazanma işlemleri üzerinde önemle durulmaya başlanmıştır. Özellikle batılı ülkelerde çevre koruma tedbirleri yoğunlaştırılarak ağır metalller gibi tehlikeli maddelerin geri kazanımında yarıgeçirgen membranların kullanılmasında önemli gelişmeler olmuştur. Ultrafiltrasyon, mikrofiltrasyon, elektrodiyaliz gibi polimerik membran sistemlerle birlikte sıvı membranlar ile de atıksu arıtımı gerçekleştirilmektedir. Aynı zamanda sıvı membranlar hidrometalurjide metal iyonlarının ayrılmasında da kullanılmaktadır. Sıvı membranlar biyoteknolojide, medikal alanlarda, gaz ayırma işlemlerinde kullanım alanlarına sahiptir.