CIESC Journal ›› 2023, Vol. 74 ›› Issue (9): 3731-3741.DOI: 10.11949/0438-1157.20230517

• Ionic Liquids and Green Processes • Previous Articles     Next Articles

Separation of methyl propionate + methanol azeotrope using ionic liquid entrainers

Lizhi WANG1(), Qiancheng HANG1, Yeling ZHENG2, Yan DING1, Jiaji CHEN1, Qing YE1, Jinlong LI1()   

  1. 1.Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, Jiangsu, China
    2.Nanjing Gekof Institute of Environmental Protection Technology & Equipment Co. , Ltd. , Nanjing 211106, Jiangsu, China
  • Received:2023-05-29 Revised:2023-08-09 Online:2023-11-20 Published:2023-09-25
  • Contact: Jinlong LI

离子液体萃取剂萃取精馏分离丙酸甲酯+甲醇共沸物

王俐智1(), 杭钱程1, 郑叶玲2, 丁延1, 陈家继1, 叶青1, 李进龙1()   

  1. 1.江苏省绿色催化材料与技术重点实验室,常州大学石油化工学院,江苏 常州 213164
    2.南京杰科丰环保技术装备研究院有限公司,江苏 南京 211106
  • 通讯作者: 李进龙
  • 作者简介:王俐智(1999—),男,硕士研究生,m18761020178@163.com
  • 基金资助:
    国家自然科学基金项目(22078026)

Abstract:

Using ionic liquids [BMIM][NTF2] and [HMIM][NTF2] as entrainer, the separation of the azeotropic mixture for methyl propionate + methanol through extractive distillation was investigated. The mechanism for extractive distillation separation was analyzed by molecular structure optimization. Based on the experimental data from literature and the authors’ previous work, the new thermodynamic model parameters of NRTL were obtained. The conventional two-column process for the separation of binary mixture was employed for the investigated system in this work. As a comparison, the process of extractive distillation and pressure swing distillation using phenol as entrainer was constructed at the same time. Based on the Aspen Plus simulation software, the influence of the main operation parameters of the above-mentioned separation process on the separation performance was analyzed, and the energy consumption, annual total cost (TAC) and CO2 emission of each process were calculated and compared. The results show that the ionic liquid process can separate the investigated azeotrope, and the purity of the product can reach to 99.9%(mass). The process with [HMIM][NTF2] entrainer can decrease, 11.68%—43.68% TAC and 32.11%—68.46% CO2 emission. The results of this work would provide theoretical basis and practical guide for the design and optimization of the separation process for azotropic methyl propionate + methanol mixture.

Key words: ionic liquids, extractive distillation, azeotrope, pressure swing distillation, TAC calculation

摘要:

以离子液体(ILs)[BMIM][NTF2]和[HMIM][NTF2]为萃取剂,萃取精馏分离丙酸甲酯+甲醇共沸物,通过分子模拟分析了ILs促进目标共沸物的分离机理;基于汽液平衡实验数据,获得新的NRTL热力学模型参数;选用常规的二组分双塔分离流程,实现了目标共沸体系的分离。作为对比,同时构建了以苯酚为萃取剂的萃取精馏和变压精馏流程。基于Aspen Plus软件平台,分析了上述各流程分离单元主要操作参数对分离过程性能的影响,考察并对比了各流程能耗、年总成本(TAC)和碳排放。结果表明:离子液体工艺可实现丙酸甲酯+甲醇共沸物的有效分离,产品纯度达到99.9%(质量分数),[HMIM][NTF2]工艺与[BMIM][NTF2]、苯酚及变压精馏工艺相比,TAC降低11.68%~43.68%、CO2 排放减少32.11%~68.46%。结果可为共沸物丙酸甲酯+甲醇分离新工艺设计及优化提供理论支撑和实际指导。

关键词: 离子液体, 萃取精馏, 共沸物, 变压精馏, TAC计算

CLC Number: