Introduction
The unit operation “extraction” is mainly applied in the downstream process of the chemical industry when other unit operations are not suitable. This is especially the case if temperature-sensitive compounds are involved, if the product and solvent boiling temperatures are similar preventing distillation or if azeotropic behavior occurs [28]. Additionally, extraction can save energy consumption if large process streams are involved. The design of extraction columns highly depends on the knowledge of the underlying liquid-liquid equilibria (LLE). An ideal extraction agent has possibly lowest solubility in the solvent while fully solubilizing the solute resulting in a large miscibility gap between solvent and solute. Conventional extraction agents are volatile organic compounds (VOCs). VOCs exhibit high vapor pressure, have high flammability, and are often environmentally harmful and toxic. In contrast, ionic liquids (ILs) may be eligible extraction agents to their unique...
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Bülow, M., Danzer, A., Held, C. (2020). Liquid-Liquid Equilibria of Binary and Ternary Systems Containing Ionic Liquids. In: Zhang, S. (eds) Encyclopedia of Ionic Liquids. Springer, Singapore. https://doi.org/10.1007/978-981-10-6739-6_108-1
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