CIESC Journal ›› 2020, Vol. 71 ›› Issue (4): 1676-1682.DOI: 10.11949/0438-1157.20190844

• Separation engineering • Previous Articles     Next Articles

Study on separation of tetrahydrofuran-ethanol-water ternary azeotrope system by ionic liquid

Wenxiu LI(),Yu ZHANG,Ying CAO,Zhonghan DING,Siyu ZHAO,Tao ZHANG()   

  1. School of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
  • Received:2019-07-24 Revised:2019-09-29 Online:2020-04-05 Published:2020-04-05
  • Contact: Tao ZHANG

离子液体用于四氢呋喃-乙醇-水三元共沸物系分离的研究

李文秀(),张羽,曹颖,丁忠瀚,赵思雨,张弢()   

  1. 沈阳化工大学化学工程学院,辽宁 沈阳 110142
  • 通讯作者: 张弢
  • 作者简介:李文秀(1963—),男,博士,教授,liwenxiu@syuct.edu.cn
  • 基金资助:
    国家自然科学基金项目(21576116)

Abstract:

Using ionic liquid 1-butyl-3-methylimidazolium dicyandiamide ([BMIM][DCA]) as extractant, the separation of tetrahydrofuran (THF)-ethanol-water ternary azeotrope was studied by process simulation and mechanism analysis. Based on COSMO-RS theory, suitable ionic liquid [BMIM] [DCA] was selected with selectivity as performance index, and the extractive distillation process was established with [BMIM] [DCA] as extractant and suitable operating conditions. The simulation results showed that the mass fraction of THF, ethanol and water was close to 1. Through the analysis of σ-profiles of [BMIM] [DCA] and three solutes, it is found that [BMIM] [DCA] can form stronger hydrogen bonds with three solutes respectively, thus breaking the inherent hydrogen bonds between the three solutes and eliminating their azeotropy.

Key words: ionic liquid, azeotrope, extractive distillation, simulation, mechanism

摘要:

以离子液体1-丁基-3-甲基咪唑二氰胺([BMIM] [DCA])为萃取剂,采用流程模拟和机理分析两种方法,对离子液体用于四氢呋喃(THF)-乙醇-水三元共沸物的分离进行了研究。通过COSMO-RS理论,以选择性为性能指标筛选出合适的离子液体[BMIM][DCA],并且以[BMIM][DCA]为萃取剂,在适合的操作条件下建立了萃取精馏过程,模拟结果表明THF、乙醇和水的质量分数都接近1。通过对[BMIM][DCA]和三种溶质的σ-谱图分析,发现[BMIM][DCA]可分别与三种溶质形成更强的氢键,从而打破三种溶质间的固有氢键,进而消除它们的共沸现象。

关键词: 离子液体, 共沸物, 萃取精馏, 模拟, 机理

CLC Number: