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萃取精馏分离碳酸二甲酯-乙醇二元共沸物

董 营,肖 颖,黄耀东,白 鹏   

  1. 天津大学化工学院,天津 300072
  • 出版日期:2013-04-05 发布日期:2013-04-05

Separation of binary azeotrope ethanol-dimethyl carbonate by extractive distillation

DONG Ying,XIAO Ying,HUANG Yaodong,BAI Peng   

  1. School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China
  • Online:2013-04-05 Published:2013-04-05

摘要: 测定了101.3 kPa下乙醇-碳酸二甲酯(DMC)和DMC-糠醛二元体系的汽液平衡数据,以及乙醇-DMC-糠醛体系在溶剂比为1∶1时的三元汽液平衡数据。结果表明,糠醛的加入可以改变乙醇和DMC的相对挥发度,并且当糠醛的摩尔分数大于0.25时,乙醇-DMC二元物系的共沸点消失。因此,可以采用萃取精馏的方法以糠醛为溶剂分离乙醇和DMC的混合物。采用Aspen Plus软件对连续萃取精馏分离乙醇-DMC共沸物的过程进行了模拟。结果表明,单塔带侧线采出的操作方式比双塔操作方式更有优势。

关键词: 碳酸二甲酯, 乙醇, 糠醛, 萃取精馏

Abstract: Vapor-liquid equilibrium data of the systems were measured at 101.3 kPa with ethanol-DMC,DMC-furfural and ethanol-DMC-furfural in a solvent ratio of 1∶1. It was shown that furfural can enlarge the relative volatility of ethanol and DMC,and the azeotropic point disappeared when mole fraction of furfural reached 0.25,indicating the feasibility of separating the ethanol-DMC mixture using extractive distillation with furfural as the solvent. Aspen Plus software was used to simulate the continuous extractive distillation processes of ethanol-DMC separation,and the single-column continuous extractive distillation process was preferred than the double-column process.

Key words: dimethyl carbonate, ethanol, furfural, extractive distillation

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