›› 2020, Vol. 22 ›› Issue (4): 137-146.

• Simulation and Optimization • 上一篇    



  1. 中国石油大学胜利学院
  • 收稿日期:2020-03-26 修回日期:2020-05-04 出版日期:2020-12-30 发布日期:2020-12-30
  • 通讯作者: 韩东敏 E-mail:547948608@qq.com
  • 基金资助:

Comparison of Extractive Distillation and Pressure-Swing Distillation for Methanol and Acetonitrile Separation

  1. Shengli College China University of Petroleum
  • Received:2020-03-26 Revised:2020-05-04 Online:2020-12-30 Published:2020-12-30

关键词: 共沸物, 萃取精馏, 变压精馏, TAC, 甲醇, 乙腈

Abstract: In the present work, a comparative study of the extractive distillation and pressure swing distillation for methanol-acetonitrile azeotropic separation is performed for the first time. Different separation alternatives, including the conventional extractive distillation, the extractive distillation with vapor or liquid side-stream, the pressure-swing distillation with or without full heat integration, and the heat-pump assisted pressure-swing distillation are rigorously simulated and optimized based on the minimum total annual cost (TAC) via the sequential iterative strategy. The results show that TAC and CO2 emission of the new extractive distillation with vapor side-stream (Vapor-SED) are similar to that of the extractive distillation with liquid side-stream (Liquid-SED). Furthermore, the Vapor-SED and Liquid-SED gives 30.01% and 30.56% reduction in TAC and 23.32% and 23.49% reduction in CO2 emission, respectively, over the most competitive fully heat-integrated PSD configuration. Hence, extractive distillation with vapor or liquid side-stream appears to be better option economically and environmentally for separation of methanol and acetonitrile.

Key words: azeotrope, extractive distillation, pressure swing distillation, TAC, Methanol, acetonitrile