编号：CDUT-2022-10

标题：Thermodynamic and economic comparison of extractive distillation sequences for separating methanol/dimethyl carbonate/water azeotropic mixtures

入藏号：WOS:000782996200004

中国科学院文献情报中心期刊分区：工程技术1区/是（2021年升级版）

本校作者：郭超，王富强

来源出版物：SEPARATION AND PURIFICATION TECHNOLOGY    卷282   子辑B  文献号120150 

出版年：2022

第一地址：成都理工大学

关键词：萃取精馏；碳酸二甲酯；离子液体；分离序列；非均相共沸精馏

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摘要：The separation of dimethyl carbonate (DMC)/methanol/water azeotropic mixtures has been a hot topic in the study of DMC synthesis process. In this work, the efficient organic solvent methyl salicylate, ionic liquids (ILs) 1- butyl-3-methylimidazolium chloride ([BMIM][Cl]), or 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([BMIM][NTf2]) was employed to break azeotropic mixtures. Interaction mechanisms between DMC/ methanol/water and entrainers were revealed by sigma-profile. Energy and economic comparison of two alternative separation sequences including pre-separation integration with extractive-heterogeneous distillation and direct extractive distillation processes were investigated. The average relative deviations (ARD) were used to check the reliability of the NRTL model. The effect of high viscosity fluid on the mass transfer was analyzed from the perspective of the overall efficiency of column. For [BMIM][Cl], the separation mechanism is the formation of H-bond between [BMIM][Cl] and methanol/water. Direct extractive distillation process is superior to preseparation integration with extractive-heterogeneous distillation process in terms of steam consumption, capital cost, mass transfer efficiency and total annual cost (TAC), and [BMIM][Cl]-based direct extractive distillation process is the best. This work provides a green and efficient separation route for replacing organic solvent-based process.

文章链接地址：https://sciencedirect.53yu.com/science/article/abs/pii/S1383586621018554