Optimization and dynamic control of green energy-saving process for azeotropes separation by mixed solvent extractive distillation

Extractive distillation (ED) is an effective method by adding solvents to separate azeotropes, where solvents can affect the separation performance of the process. In order to improve the economic and environmental performance of the ED process, different kinds of mixed solvents have been widely concerned by scholars in recent years. In this work, from the effect of mixed solvents on ED, the process design, process energy saving and dynamic control of different types of mixed solvent technology are discussed. In addition, the computer-assisted screening model of the composition of mixed solvents is introduced, and the thermodynamic model Conductor-like Screening Model (COSMO) can analyze the interaction mechanism of solvents and azeotropic system from a microscopic point of view, it has the advantages of accuracy and efficiency in selecting mixed solvents, which provides a new idea for solvent screening. Furthermore, a new green solvent with deep eutectic solvents that is affordable and less toxic is proposed as a component of the mixed solvent in view of the problems existing in the current mixed solvents. The research provides an outlook on the future development direction of mixed solvent ED.