Systematic approach for screening organic and ionic liquid solvents in homogeneous extractive distillation exemplified by the tert-butanol dehydration

Yanjie Hu, Yang Su, Saimeng Jin, I. Lung Chien, Weifeng Shen*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

84 Scopus citations

Abstract

A systematic strategy for the screening of organic solvents and ionic liquids as entrainers along with the design of the corresponding homogeneous extractive distillation processes has been developed. The proposed approach is illustrated by an example of the entrainer screening in the dehydration of tert-butanol. The toxicity and the physical properties of two types of entrainers (e.g., 19 organic solvents and 289 ionic liquids) are first considered. Then, the properties related to separation performance are further evaluated and three organic solvents and 11 ionic liquids are found to conform to the process feasible restrictions. In the third step, glycerol, triethylene glycol, 1-butyl-3-methylimidazolium thiocyanide [C4MIM][SCN], and 1-pentyl-3-methylimidazolium thiocyanide [C5MIM][SCN] are chosen as the representatives to perform thermodynamic topological analysis. Finally, the process design and optimization with four entrainers are performed using the minimization of total annualized cost as the objective function. And the process economic evaluation proves that the ability of glycerol in separating tert-butanol-water system is superior to those of 18 organic solvents candidates while that of [C4MIM][SCN] is the most advantageous entrainer among 289 ILs in terms of saving energy.

Original languageEnglish
Pages (from-to)723-737
Number of pages15
JournalSeparation and Purification Technology
Volume211
DOIs
StatePublished - 18 03 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018 Elsevier B.V.

Keywords

  • Entrainer screening
  • Homogeneous extractive distillation
  • Ionic liquids
  • Organic solvents
  • tert-Butanol dehydration

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