石油化工设计 ›› 2025, Vol. 42 ›› Issue (3): 18-22.

• 设计技术 • 上一篇    下一篇

萃取精馏分离乙腈-异丙醇的过程模拟与工艺优化

李璟12,袁注升2,洪慧怡2,黄显延2   

  1. 1. TCL环保科技股份有限公司,广东 惠州,5160062. 惠州TCL环境科技有限公司,广东 惠州,516006
  • 收稿日期:2024-12-26 出版日期:2025-08-25 发布日期:2025-08-25
  • 作者简介:李璟,男,2011年毕业于华南理工大学化学工程专业,硕士,工程师。主要从事化工及环保工艺的研发与设计工作,已发表论文25篇。联系电话:0769-89202998.

SIMULATION AND OPTIMIZATION OF ACETONITRILE-ISOPROPANOL SEPARATION BY EXTRACTIVE DISTILLATION

Li Jing1, 2, Yuan Zhusheng2, Hong Huiyi2, Huang Xianyan2   

  1. 1. TCL Environmental Technology Co., Ltd., Huizhou, Guangdong, 516006; 2. Huizhou TCL Environmental Technology Co., Ltd., Huizhou, Guangdong, 516006
  • Received:2024-12-26 Online:2025-08-25 Published:2025-08-25

摘要: 采用ASPEN Plus模拟软件对乙腈-异丙醇二元共沸体系的分离过程进行模拟,筛选出最佳的萃取剂乙二醇(EG),并对乙二醇萃取精馏回收乙腈和异丙醇的分离过程进行优化分析,确定了萃取精馏工艺过程最佳的操作工艺参数,模拟结果表明:萃取精馏过程在负压工况下操作;萃取塔最佳的理论板数为20层,原料和萃取剂分别从第7和第18层进料,溶剂比为1.2,回流比为1;回收塔最佳的理论板数为7,最佳的进料层数为4,回流比为0.35。优化后乙腈和异丙醇产品的质量分数分别为99.25%和99.39%。萃取塔和回收塔的再沸器热负荷分别为473.01 kW和493.25 kW,冷凝器热负荷分别为395.11 kW和298.22 kW。采用乙二醇为萃取剂分离乙腈和异丙醇,可得到高纯度的乙腈和异丙醇产品。乙二醇回收后可循环利用至萃取精馏过程。

关键词: 乙腈, 异丙醇, 萃取精馏, 乙二醇

Abstract:

The separation process of acetonitrile-isopropanol binary azeotropic system was simulated by Aspen Plus simulation software, and ethylene glycol was selected as the best extractant. The separation process for recovering acetonitrile and isopropanol by ethylene glycol extractive distillation was optimized and analyzed, and the optimal operating parameters of the extractive distillation process were determined as follows: the extractive distillation process is operated under negative pressure, the optimum number of theoretical plates in the extraction column is 20, with the raw material and extractant fed into the 7th and 18th stages, respectively, the solvent ratio is 1.2, the reflux ratio is 1, the optimum number of theoretical plates in the recovery column is 7, the optimum number of feed stage is 4, and the reflux ratio is 0.35. After optimization, the mass fractions of acetonitrile and isopropanol are 99.25% and 99.39%, respectively. The reboiler duty requirements of the extraction column and the recovery column are 473.01 kW and 493.25 kW, respectively, and the condenser duty requirements of the extraction column and the recovery column are 395.11 kW and 298.22 kW, respectively. High purity acetonitrile and isopropanol products can be obtained by extractive distillation using ethylene glycol as the extractant. The ethylene glycol recovered can be recycled to the extractive distillation process.


Key words: acetonitrile, isopropanol, extractive distillation, ethylene glycol