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Annals of Chemical Science Research

Nanostructure-Based LLE Separation: Regulatory Considerations and Safety Evaluation

Rahmdel Delcheh Sh1*, Pourvahabi Anbari A2,3, Verpoort F4,5 and Serge Zhuiykov3,6

1Department of Chemistry, Faculty of Science, University of Guilan, Iran

2Department of Chemistry, Faculty of Science, Ghent University, Belgium

3Center for Environmental and Energy Research (CEER), Ghent University Global Campus, South Korea

4Laboratory of Organometallics, Catalysis and Ordered Materials, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China

5National Research Tomsk Polytechnic University, Lenin Avenue 30, Russia

6Department of Solid-State Sciences, Faculty of Science, Ghent University, Belgium

*Corresponding author:Rahmdel Delcheh Sh, Department of Chemistry, Faculty of Science, University of Guilan, Rasht, Iran

Submission: July 20, 2023;Published: August 21, 2023

DOI: 10.31031/ACSR.2023.04.000587

Volume4 Issue3
August, 2023


The pharmaceutical, petrochemical and environmental remediation industries all rely heavily on liquid-liquid equilibrium (LLE) separations. The effectiveness and efficiency of traditional LLE methods are frequently questioned. The incorporation of nanostructures into LLE systems has shown promise in recent years as a means to circumvent these restrictions. Using nanostructures in LLE separations has the potential to solve the issues of efficiency and cost that have plagued traditional techniques. Nanostructures offer many advantages for liquid-liquid phase separation if their large surface area, variable surface chemistry, and improved mass transfer capabilities can be put to use. This brief review is a helpful tool for scientists and engineers curious about the promising possibilities presented by nanostructured LLE separations.

Keywords:Liquid-liquid equilibrium (LLE) separations; Nanostructures; Efficiency; Cost-effectiveness; Large surface area


An overview of Liquid-Liquid Equilibrium (LLE) separation

Many industries employ liquid-liquid equilibrium (LLE) to separate immiscible liquids. This approach separates components into two liquid phases by solubility, density and intermolecular interactions. LLE separation is crucial in pharmaceutical, petroleum, chemical and environmental cleaning sectors. Distillation, extraction and solvent-based LLE separation methods have energy, selectivity and environmental difficulties [1-3]. Due of these challenges, scientists have sought new approaches to improve LLE separation techniques. Nanostructures may work. Nanostructures are nanoscale materials (typically less than 100nanometers). Their new physicochemical properties result from their enormous surface area relative to volume, quantum confinement effects and enhanced intermolecular interactions.

Nanostructures may enhance mass transfer rates and selectivity, making them attractive for LLE separation. LLE separation has been researched using nanoparticles, nanofibers and nanocomposites. Nanoparticles may be modified to modify interfacial tensions and separate immiscible liquid phases [4-8]. Nanofibers’ high aspect ratios and unique form increase interfacial area and selectivity. Nanocomposites enhance separation efficiency and have several uses by mixing nanostructures. Nanostructure synthesis and LLE separation manufacturing have been widely researched. Chemical precipitation, sol-gel synthesis, electrospinning and template-assisted methods have produced nanostructures with well-defined dimensions and surfaces [9]. Surface functionalization and modification may modify nanostructure interactions with liquid phases and separation. Understand the processes and causes affecting LLE separation nanostructures to intelligently create and optimize them. These mechanisms include capillary forces, electromagnetic and electric fields, and wetting and contact angle changes. Computational modelling and simulation have been utilized to study nanoscale processes and build effective separation systems. Nanostructures for LLE separation is promising in several domains [10]. Drug extraction, purification and formulation employ nanostructured materials. Nanostructures improve oil-water separation and petrochemical hydrocarbon recovery. Nanostructures have been employed in biotechnology, food and drink manufacturing and pollution cleanup. Nanostructures can increase LLE separation, but the advantages exceed the challenges. These problems include nanostructure cost-effectiveness, scalability, multifunctionality and integration with traditional separation technologies. Solving these issues will enable extensive industrial usage and advancement. Nanostructures may improve liquid-liquid equilibrium separation performance, selectivity, and endurance. This overview shows what nanostructures can do and underlines the need for additional research. Using nanostructures and tackling their difficulties may revolutionize LLE separation and open up new industrial uses [11].

Nanostructures for LLE Separation

Nanostructures are used in liquid-liquid equilibrium (LLE) separation procedures to reduce cost and environmental impact. Conventional methods have low selectivity, high energy expenditure and environmental difficulties. Nanostructures provide unique answers to these issues and novel ways to improve LLE separation. Nanostructures’ high surface-to-volume ratio drives them. Nanostructures’ large interfacial area aids mass transfer between immiscible liquid phases. The greater interfacial area accelerates phase diffusion and interaction, improving separation efficiency and speed. Nanostructures’ changing surface features enable finetuning of intermolecular interactions and interfacial tensions. By changing their surface chemistry or adding functional groups, nanostructures may bind to certain liquids. This favored contact makes target molecule separation more selective. Nanostructures may be constructed to absorb or reject one liquid phase while spreading the other. This decreases emulsions and enhances phase separation. Nanostructures’ synergy and multifunctionality support LLE separation. Combining nanostructures or adding them to existing separation processes may improve performance. Smart nanostructured systems that respond to external stimuli or selfclean may also improve LLE separation processes. Nanostructure applications in LLE separation are driven by overcoming traditional limitations and discovering novel efficient, selective and environmentally friendly separation techniques. Researchers intend to leverage nanostructures’ unique properties to create novel separation technologies across industries [9-15].

LLE Separation Nanostructure Types

Each nanostructure for liquid-liquid equilibrium (LLE) separation has distinct features and benefits. Selectivity, interfacial area enhancement and liquid phase compatibility determine the best nanostructure for the separation process. Nanoparticles, colloidal particles between 1 and 100nanometers are a common nanostructure. Nanoparticles have high surface-to-volume ratios and may be functionalized to change their surface chemistry and liquid phase interactions. Their tiny size improves mass transfer and component partitioning by dispersing and contacting liquid mixes. Surfactants like nanoparticles reduce interfacial tensions and promote well-defined liquid-liquid interfaces. Surface changes like ligands or functional groups help nanoparticles preferentially adsorb or repel components, improving separation. Nanofibers, with high aspect ratios and distinctive morphologies, are used in LLE separation [16-19]. Electrospinning, template-assisted procedures, and self-assembly may make nanofibers. Their elongated construction maximizes liquid phase interfacial area, improving mass transfer and separation. Nanofibers selectively adsorb or immobilize target components due to their high aspect ratio. Nanofiber porosity and surface functionalization may be adjusted to increase affinity for certain chemicals, allowing more accurate and efficient separation. Nanocomposites-hybrid materials made of nanostructures-have also showed potential in LLE separation [20-22]. Nanocomposites have synergistic effects and increased separation performance by mixing nanostructures. Nanoparticles in a nanofiber matrix increase interfacial area and surface functions for selective separation. Nanocomposites with regulated morphologies and optimal interfacial interactions maximize separation efficiency and selectivity. For LLE separation, nanoparticles, nanofibers and nanocomposites have been investigated. Each variety has specific benefits, including greater surface area, selective adsorption or repulsion and improved interfacial interactions. The nanostructure used relies on the separation goals and process liquid phases. This discovery might transform LLE separation and enable more efficient and sustainable separation methods [23-25].

Methods of separation utilizing LLE (Liquid-Liquid Extraction)

Chemical engineering, the pharmaceutical industry and environmental science all rely on liquid-liquid extraction (LLE) as a key separation technique. The process of liquid-liquid extraction (LLE) entails moving one or more solutes from one liquid phase (the feed or source phase) into another liquid phase (the extract or solvent phase), which is not miscible with the first. Optimal process optimization and highly selective extraction require knowledge of the mechanisms underpinning LLE separation. Separation mechanisms for LLEs are highly sensitive to the physicochemical characteristics of the solutes, solvents and their interactions. Following is a quick review of several major mechanisms that contribute to the success of LLE separation: First, LLE is predicated on the fact that the solutes in the two immiscible liquid phases have distinct solubilities. The solute divides up between the two phases according to how well it dissolves in each. Separation occurs when solutes with greater solubility in the solvent phase move more quickly from the feed phase to the extract phase [1,13,26]. The distribution coefficient drives a crucial function in LLE called partitioning. At equilibrium, the solute concentration in the extract phase is proportional to the solute concentration in the feed phase and this ratio is represented by the distribution coefficient. Because of their unique chemical properties and the characteristics of the solvents, solutes partition themselves between the phases. Third, Molecular Interactions: Interactions between molecules are critical to LLE separation, including hydrogen bonding, dipoledipole interactions, and Vander Waals forces. The solubility and partitioning behavior are affected by the solute-solvent interactions. Because of their stronger intermolecular interactions, polar solutes, for instance, have a greater propensity to preferentially dissolve in polar fluids. The solutes’ pH and ionization state can also have an effect on LLE separation. Depending on the pH, ionizable solutes can take on a variety of charged states [ 27-29]. The ionization constants of the solutes and the pH of the aqueous phase determine how the solutes are partitioned between the two phases. The efficiency and selectivity of LLE separation can be improved by adjusting the pH. Fast and thorough separation in LLE is only possible with effective mass transfer. Mass transfer velocity is determined by several variables, including phase boundary area, solute diffusivities and system hydrodynamics. Mass transfer rates and separation efficiency can be increased through stirring, agitation, and the application of extraction aids like surfactants. The dispersion of the two liquid phases into tiny droplets is a problem in LLE separation since it leads to the creation of stable emulsions. The effectiveness of LLE can be diminished by emulsions, which impede phase separation. To fix problems caused by emulsions, scientists use methods including demulsifiers, phase separation aids, and coalescence promoters. Finally, in order to build and optimize effective extraction techniques, knowledge of the mechanisms underlying LLE separation is essential. A number of factors contribute to LLE’s overall success, including solubility, partitioning, molecular interactions, pH, ionization, mass transfer, and emulsion formation. Researchers and engineers can increase selectivity, yields and the sustainability of extraction processes in a variety of sectors by adapting these mechanisms to the unique needs of a separation system [1,30-31].

Mechanisms and Forces Governing Nanostructure Efficiency

When it comes to improving the effectiveness of liquidliquid emulsion (LLE) separation processes, nanostructures like nanoparticles and nanomaterials play a significant role. This is because they facilitate the coalescence and separation of emulsion droplets by decreasing the interfacial tension between the immiscible liquid phases. Emulsion droplets can be destabilized and coagulated by nanostructures via the application of electrostatic forces, Vander Waals interactions and steric effects. To maximize the design and performance of nanostructure-based LLE separation systems, it is necessary to take into account the nanostructures’ size, shape, surface chemistry and concentration, as well as the emulsion’s properties. In conclusion, nanostructures show great promise for enhancing LLE separation performance.

Nanostructures aid in the coalescence and separation of emulsion droplets by altering interfacial characteristics and harnessing numerous forces, including electrostatic and vander Waals forces. A thorough familiarity with the parameters impacting nanostructure performance and careful consideration of the emulsion’s qualities is, nonetheless, necessary for obtaining maximum efficacy. The development of LLE separation technologies and the solving of industrial separation problems show great potential for the future of research in this area [19-22].

Capillary forces and separation enhancement

In order to improve the effectiveness of liquid-liquid emulsion (LLE) separation, nanostructures like nanoparticles and nanomaterials can be used to decrease interfacial tension and make use of electrostatic, Vander Waals and steric forces. As a result of their high surface-to-volume ratio, emulsion droplets are able to make more contact with them, speeding up the coalescence and separation processes. Nanostructures improve separation efficiency by lowering the interfacial tension between two immiscible liquid phases by altering their interfacial characteristics. Electrostatic and Vander Waals forces can be manipulated to produce coagulation or destabilization of emulsion droplets, respectively, by creating nanostructures with the proper surface charges or shape. Size, shape, surface chemistry, concentration and the physicochemical qualities of the emulsion all have a role in the efficacy of nanostructures. Improvements in LLE separation methods can be achieved via better understanding and optimization of these parameters [32-34]

Challenges and Future Perspectives

Scalability and practical application of nanostructures in liquidliquid emulsion (LLE) separation, as well as worries over their effects on the environment and human health, remain significant obstacles. Cost, stability and compatibility must be carefully considered when attempting to scale up the manufacture of nanostructures and integrate them into current systems. Furthermore, analyzing the environmental impact of nanostructures and creating mitigation techniques is vital for assuring their safety and sustainability. New nanostructures, developments in materials science and the combination of complementing technologies provide hopeful prospects for the future, though. More research and better analytical methods could increase the efficiency and selectivity of LLE separation procedures, which would have far-reaching implications for many sectors of the economy [35].

Multifunctional Nanostructures and Smart Separation Systems

Multifunctional nanostructures and smart separation systems have emerged as transformative technologies in separation processes. Multifunctional nanostructures possess multiple capabilities, such as catalysis and selective binding, enabling simultaneous addressing of multiple separation requirements. Integration of intelligent components and control mechanisms in smart separation systems allows real-time monitoring and adjustment of operating parameters, optimizing efficiency and selectivity. Challenges include scalability, stability and integration of intelligent components, but advancements in these areas hold promise for their widespread application in industries such as water treatment and pharmaceuticals. Continued research and development will unlock the full potential of multifunctional nanostructures and smart separation systems, revolutionizing separation processes in various fields [36].

Potential for large-scale industrial implementation

Nanostructures have great promise for widespread commercial application in liquid-liquid emulsion (LLE) separation. The ability to mass produce nanostructures calls for the creation of efficient and reliable production methods. While engineering difficulties exist, seamless functioning is impossible without integrating nanostructures into existing separation systems. In order to persuade enterprises to embrace these cutting-edge separation technologies, it is crucial to assess their cost-effectiveness and return on investment. Safe usage and disposal of nanostructures is essential and this requires careful attention to regulations and safety concerns. Large-scale adoption is difficult, but it pays off in increased separation efficiency, better product quality, lower energy usage and less environmental effect. Nanostructure-based LLE separation systems will be adopted by industry as a result of further research, collaboration, and technological breakthroughs [37,38].


Last but not least, incorporating nanostructures into liquidliquid emulsion (LLE) separation processes has the potential to greatly improve both efficiency and economy. Using these cuttingedge components can boost separation efficiency, leading to better final products with less energy used. Important obstacles include figuring out how to mass-produce nanostructures and figuring out how to incorporate them into existing separation systems. However, novel manufacturing procedures can be created with continuous R&D, opening the door for widespread adoption of nanostructurebased LLE separation across a number of sectors. The potential for nanostructure-based LLE separation to aid in environmentally sustainable activities is a significant benefit. As the process becomes more efficient and selective, less trash is produced and the effect on the environment is lessened. Furthering the cause of sustainability, the incorporation of smart components and control mechanisms can improve resource usage and process adaptability. As research advances, nanostructure-based LLE separation approaches are likely to be implemented across a wide range of sectors. These cutting-edge separation methods have the potential to revolutionize several fields, including the chemical and pharmaceutical industries as well as the cleanup of polluted environments. Nanostructurebased LLE separation has the possibility for increased product yields, decreased operational costs and enhanced environmental performance, making it a desirable option for industry. Successful implementation requires close cooperation between academic institutions, businesses, and government agencies. Scalability, efficiency, cost, safety and regulation all become more manageable when they are tackled in tandem. Accelerating the adoption of nanostructure-based LLE separation technologies in industry can be accomplished by encouraging a multidisciplinary approach that leads to breakthroughs in materials research, engineering, and process optimization.

In conclusion, nanostructures have the potential to revolutionize LLE separation by delivering higher efficiency and more cost-effective approaches. When it comes to sustainability and process performance, nanostructure-based LLE separation has the potential to offer considerable advantages thanks to the use of green practices and the likelihood of adoption in a wide range of industries. Unlocking the full potential of nanostructurebased LLE separation and paving the path toward a greener, more efficient future in separation processes will require further study, collaboration, and technological improvements.


  1. Ghanadzadeh GA, Jahanbin Sj, Verpoort, F, Rahmdel S (2021) Experimental study and thermodynamic modeling of phase equilibria of systems containing cyclohexane, alcohols (C4 and C5), and deep eutectic solvents. Journal of Molecular Liquids 340: 117196.
  2. Abbott AP, Capper G, Davies DL, Rasheed RK, Tambyrajah V (2003) Novel solvent properties of choline chloride/urea mixtures. Chem Commun (Camb), (1): 70-1.
  3. Chen Z, Zhou B, Cai H, Zhu W, Zou X (2009) Simple and efficient methods for selective preparation of α-mono or α, α-dichloro ketones and β-ketoesters by using DCDMH. Green Chem 11(2): 275-278.
  4. Oliveira FS, Pereiro AB, Rebelo LPN, Marrucho IM (2013) Deep eutectic solvents as extraction media for azeotropic mixtures. Green Chemistry 15(5): 1326.
  5. Li G, Zhu T, Lei Y (2015) Choline chloride-based deep eutectic solvents as additives for optimizing chromatographic behavior of caffeic acid. Korean Journal of Chemical Engineering 32(10): 2103-2108.
  6. Abbott AP, Boothby D, Capper G, Davies DL, Rasheed RK (2004) Deep eutectic solvents formed between choline chloride and carboxylic acids: Versatile alternatives to ionic liquids. Journal of the American Chemical Society 126(29): 9142-9147.
  7. Martins MAR, Pinho SP, Coutinho JAP (2018) Insights into the nature of eutectic and deep eutectic mixtures. Journal of Solution Chemistry 48(7): 962-982.
  8. Meenu M, Bansal V, Rana S, Sharma N, Kumar V, et al. (2023) Deep eutectic solvents (DESs) and natural deep eutectic solvents (NADESs): Designer solvents for green extraction of anthocyanin. Sustainable Chemistry and Pharmacy 34: 101168.
  9. Yu Y, Zhang F, Zhang X (2022) Liquid-liquid equilibrium for ternary systems of n-octanol, ethylene glycol, and different extractants at 298.2 K. Journal of Chemical & Engineering Data 67(10): 3146-3154.
  10. Yang F, Zhang Q, Xin H, Wu T, Zhang Z (2023) Liquid-liquid equilibrium measurement for the separation of n-propanol + n-propyl acetate using imidazolium-based ionic liquids with different anions at T = 303.15K. Journal of Chemical & Engineering Data 68(4): 936-944.
  11. Su Z, Guo X, Jiang S, Li J, Xin Y, et al. (2022) Liquid-liquid equilibrium data for [MMIM][DMP] + salt aqueous biphasic systems and their application for [MMIM][DMP] recovery. Journal of Chemical & Engineering Data 67(9): 2573-2582.
  12. Geng C, Li X, Wu X, Yu H, Zhang F, et al. (2023) Liquid-liquid equilibrium and mechanism study on separation of short carbon chain hydrocarbon mixtures by Cyrene. The Canadian Journal of Chemical Engineering 101(8): 4731-4745.
  13. Almashjary KH, Khalid M, Dharaskar S, Jagadish P, Walvekar R, et al. (2018) Optimisation of extractive desulfurization using choline chloride-based deep eutectic solvents. Fuel 234: 1388-1400.
  14. Ghanadzadeh GA, Akbarnia DA, Rahmdel DS, Verpoort F (2020) Cyclopentanone-alkanediol systems: Experimental and theoretical study on hydrogen-bond complex formation. Industrial & Engineering Chemistry Research 59(40): 18318-18334.
  15. Anbari AP, Delcheh SR, Heynderickx PM, Chaemcheun S, Zhuiykov S, et al. (2023) Green approach for synthesizing copper-containing zifs as efficient catalysts for click chemistry. Catalysts 13(6): 1003.
  16. Gholampour N, Ezugwu CI, Rahmdele S, Gilanie AG, Verpoort, F (2022) Adsorptive removal and catalytic performance of metal-organic frameworks containing mixed azolium-bipyridine ligand. Resources Chemicals and Materials 1(3-4): 201-210.
  17. Yu Y, Yang L, Tan B, Hu J, Wang Q, et al. (2020) Remarkable separation of C5 olefins in anion-pillared hybrid porous materials. Nano Research 14(2): 541-545.
  18. Altuwaim MS, Al-Jimaz AS, Alkhaldi KHAE (2019) Effect of the alkyl chain on the physical properties of imidazolium-based ionic liquids with 1-propanol, 1-butanol, and 1-pentanol binary mixtures. Journal of Chemical & Engineering Data 64(4): 1366-1377.
  19. Alkhaldi KHAE, Al-Jimaz AS, Altuwaim, MS (2018) Liquid extraction of toluene from heptane, octane, or nonane using mixed ionic solvents of 1-ethyl-3-methylimidazolium methyl sulfate and 1-hexyl-3-methylimidazolium hexafluorophosphate. Journal of Chemical & Engineering Data 64(1): 169-175.
  20. Altuwaim MS, Alkhaldi KHAE, Al-Jimaz AS, Alanezi, KM (2019) Separation of alkylbenzenes from n-heptane using binary mixtures of ionic solvents. Journal of Chemical & Engineering Data 64(3): 1187-1194.
  21. Li C, Zhang J, Li Z, Yin J, Cui Y, et al. (2016) Extraction desulfurization of fuels with ‘metal ions’ based deep eutectic solvents (MDESs). Green Chemistry 18(13): 3789-3795.
  22. Amini M, Ramezani S, Anbari AP, Beheshti A, Gautam S, et al. (2018) Simple preparation of cuprous oxide nanoparticles for catalysis of azide–alkyne cycloaddition. Journal of Chemical Research 42(3): 166-169.
  23. Yao H, Yang D, Li C, Wang E (2018) Intensification of water on the extraction of pyridine from n-hexane using ionic liquid. Chemical Engineering and Processing-Process Intensification 130: 61-66.
  24. Li Z, Tan B, Zhang Q, Wang Y, Yang L (2022) Process modeling of boron isotopes separation by cross-current and counter-current solvent extraction. Industrial & Engineering Chemistry Research 61(49): 18121-18126.
  25. Santos JS, Craig AP, Santana JM, Santos AF, Heredia MF, et al. (2015) Liquid-liquid equilibrium for ternary systems containing water, oleic acid, and alcohols at 313.15 K. effect of alcohol chain length. Journal of Chemical & Engineering Data 60(7): 2050-2056.
  26. Ren Y, Liao Z, Sun J, Jiang B, Wang J, et al. (2019) Molecular reconstruction: Recent progress toward composition modeling of petroleum fractions. Chemical Engineering Journal 357: 761-775.
  27. Navarro P, García ID, Larriba M, Mellado ND, Ayuso M, et al. (2019) Dearomatization of pyrolysis gasoline by extractive distillation with 1-ethyl-3-methylimidazolium tricyanomethanide. Fuel Processing Technology 195: 106156.
  28. Larriba M, Riva J, Navarro P, Moreno D, Mellado ND, et al. (2018) COSMO-based/aspen plus process simulation of the aromatic extraction from pyrolysis gasoline using the {[4empy][NTf 2]+[emim][DCA]} ionic liquid mixture. Separation and Purification Technology 190: 211-227.
  29. Navarro P, Pérez AO, Ayuso M, Mellado ND, Larriba M, et al. (2019) Cyclohexane/cyclohexene separation by extractive distillation with cyano-based ionic liquids. Journal of Molecular Liquids 289: 111120.
  30. Cai C, Fan X, Han X, Li J, Vardhan H (2020) Improved desulfurization performance of polyethyleneglycol membrane by incorporating metal organic framework CuBTC. Polymers 12(2): 414.
  31. Visak ZP, Calado MS, Vuksanovic JM, Ivanis GR, Branco AS, et al. (2019) Solutions of ionic liquids with diverse aliphatic and aromatic solutes-phase behavior and potentials for applications: A review article. Arabian Journal of Chemistry 12(7): 1628-1640.
  32. Calado MS, Ivanis GR, Vuksanovic JM, Kijevcanin ML, Serbanovic SP, et al. (2013) “Green meets green”-sustainable solutions of imidazolium and phosphonium ionic liquids with poly(ethylene glycol): Solubility and phase behavior. Fluid Phase Equilibria 344: 6-12.
  33. Ivanis GR, Vuksanovic JM, Calado MS, Kijevcanin ML, Serbanovic SP, et al. (2012) Liquid–liquid and solid–liquid equilibria in the solutions of poly(ethylene glycol) with several organic solvents. Fluid Phase Equilibria 316: 74-84.
  34. Doulabi FS, Nia MM (2006) Ternary liquid-liquid equilibria for systems of (Sulfolane + Toluene or Chloronaphthalene + Octane). Journal of Chemical & Engineering Data 51(4): 1431-1435.
  35. Gaile AA, Kostenko AV, Semenov LV, Koldobskaya LL (2005) Extraction of 1-methylnaphthalene, benzothiophene, and indole with N-methylpyrrolidone from their mixtures with alkanes. Russian Journal of Applied Chemistry 78(9): 1403-1407.
  36. Gaile AA, Erzhenkov AS, Koldobskaya LL, Solovykh IA (2009) Liquid-liquid phase equilibrium in the system heptane-toluene-mixed extractant triethylene glycol-sulfolane-water. Russian Journal of Applied Chemistry 82(7): 1172-1177.
  37. Liu C, Zhang H, Wang Y, Bai H, Zhao D, et al. (2021) The physical nature of the interaction in DMSO extraction separation of C8H10 isomer/n-decane systems. Physical Chemistry Chemical Physics 23(39): 22629-22639.
  38. Zhang Y, Wang H, Zhao L, Gao J, Xu C (2019) Olefin separation from FCC naphtha by dimethyl sulfoxide: Effect of structure on the separation and correlation of thermodynamic models. Separation and Purification Technology 228: 115757.

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