Mechanism Analysis, Economic Optimization, and Environmental Assessment of Hybrid Extractive Distillation–Pervaporation Processes for Dehydration of n-Propanol,ACS Sustainable Chemistry & Engineering

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Mechanism Analysis, Economic Optimization, and Environmental Assessment of Hybrid Extractive Distillation–Pervaporation Processes for Dehydration of n-Propanol
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-03-13 , DOI: 10.1021/acssuschemeng.0c00263
Yumin Wu _{1,

2} , Dapeng Meng ₁ , Dong Yao ₁ , Xingyi Liu ₁ , Ying Xu ₁ , Zhaoyou Zhu _{1,

2} , Yinglong Wang _{1,

2} , Jun Gao ₃

Affiliation

n-Propanol, as an important chemical raw material, is used as a solvent and intermediate in chemical industrial production and drug synthesis. In chemical production, alcohol and water easily form an azeotrope which is difficult to separate. In this work, a method of dehydration of n-propanol by pervaporation-assisted extractive distillation is proposed. Glycerol is selected as entrainer by quantum chemical calculation. A combined pervaporation unit with cellophane as a membrane is designed to separate the entrainer and water. The pervaporation unit is developed by using the Aspen Custom Modeler. Based on the minimum total annual cost, the extractive distillation process, feed-preheating extractive distillation process, and pervaporation-assisted extractive distillation process are optimized. The results show that the total annual cost of pervaporation-assisted extractive distillation is minimum and can reduce the total annual cost by 21.25%, compared with extractive distillation. Life cycle analysis is used to evaluate the environmental impact of processes. The results of environmental performance evaluation show that the pervaporation-assisted extractive distillation has the least environmental impact. Thus, the integration technology of membrane and distillation is of great significance in the sustainable process of chemical design and development.

中文翻译：

机理分析，经济优化和混合萃取精馏，渗透汽化过程的脱水的环境评估ñ丙醇

正丙醇是重要的化学原料，在化学工业生产和药物合成中用作溶剂和中间体。在化学生产中，酒精和水很容易形成共沸物，难以分离。在这项工作中，n的脱水方法提出了通过全蒸发辅助萃取蒸馏的异丙醇。通过量子化学计算选择甘油作为夹带剂。设计了以玻璃纸为膜的组合式渗透蒸发装置，以分离夹带剂和水。渗透蒸发单元是通过使用Aspen Custom Modeler开发的。基于最低的年度总成本，对萃取蒸馏工艺，进料预热萃取蒸馏工艺和全蒸发辅助萃取蒸馏工艺进行了优化。结果表明，与萃取蒸馏相比，全蒸发辅助萃取蒸馏的年度总成本最低，可将年度总成本降低21.25％。生命周期分析用于评估流程对环境的影响。环境性能评估结果表明，全蒸发辅助萃取蒸馏对环境的影响最小。因此，膜和蒸馏的集成技术在化学设计和开发的可持续过程中具有重要意义。

更新日期：2020-03-16

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