文献类型：期刊文献

英文题名：Low pressure design for reducing energy cost of extractive distillation for separating diisopropyl ether and isopropyl alcohol

作者：You, Xinqiang[1,2,3,4,5];Rodriguez-Donis, Ivonne[4,5];Gerbaud, Vincent[4,5]

机构：[1]E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Gemstone Testing Ctr, Shanghai 200237, Peoples R China;[4]Univ Toulouse, INP, UPS, LGC, 4 Allee Emile Monso, F-31432 Toulouse 04, France;[5]CNRS, LGC, F-31432 Toulouse 04, France

年份：2016

卷号：109

起止页码：540

外文期刊名：CHEMICAL ENGINEERING RESEARCH & DESIGN

收录：;EI(收录号：20161202120415);WOS:【SCI-EXPANDED(收录号:WOS:000376695200050)】；

基金：Xinqiang You thanks the Chinese Scientific Council for its support.

语种：英文

外文关键词：Extractive distillation; Energy saving; Low pressure distillation; Extractive efficiency indicator; Optimization

摘要：We show how reducing pressure can improve the design of a 1.0-1a mixture homogeneous extractive distillation process and we use extractive efficiency indicators to compare the optimality of different designs. The case study concerns the separation of the diisopropyl ether (DIPE)-isopropyl alcohol (IPA) minimum boiling azeotrope with heavy entrainer 2-methoxyethanol. We first explain that the unexpected energy cost OF decrease following an increase of the distillate outputs is due to the interrelation of the two distillate flow rates and purities and the entrainer recycling through mass balance when considering both the extractive distillation column and the entrainer regeneration column.. Then, we find that for the studied case a lower pressure reduces the usage of entrainer and increases the relative volatility of DIPE-IPA for the same entrainer content in the extractive column. A 0.4 atm operating pressure is selected to enable the use of cheap cooling water in the condenser. We run an optimization of the entrainer flow rate, both columns reflux ratios, distillates and feed locations by minimizing the total energy consumption per product unit. Double digit savings in energy consumption are achieved while TAC is reduced significantly. An extractive efficiency indicator that describes the ability of the extractive section to discriminate the desired product between the top and the bottom of the extractive section of the extractive section is calculated for comparing and explaining the benefit of lowering pressure on the basis of thermodynamic insight. (C) 2016 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.