CIESC Journal

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醇脱水连续渗透汽化分离过程设计

陈欢林; 朱长乐   

  1. Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2000-12-18 发布日期:2000-12-18
  • 通讯作者: 陈欢林

Process Design of Continuous-Flow Pervaporation Separa tion for Alcohol Dehydration

CHEN Huanlin; ZHU Changle   

  1. Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2000-12-18 Published:2000-12-18
  • Contact: CHEN Huanlin

摘要: The separation characteristics of the PVA-CS (polyvinyl alcohol-chitosan) blended composite
membrane for dehydration of ethanol-water mixture are examined. The relationships of flux
and separation factor with the feed concentration and operation temperature are
established. Using this correlated equation, the continuous-flow pervaporation process
about 500 kilolitres/year dehydrated ethanol is designed. The numbers of stage and reheater
are calculated by stage-by-stage method for two kinds of cascades: one with equal membrane
area and the other with 10℃C of temperature decrement per section. The results show that
when the numbers of stage and reheater are the same, the cascade with 10℃C of temperature
decrement has more advantages than that with equal membrane area. The influences of feed
concentration and flow rate on the numbers of stage and reheater in the cascades are
discnssed.

关键词: pervaporation;membrane separation;process design;alcohol dehydration

Abstract: The separation characteristics of the PVA-CS (polyvinyl alcohol-chitosan) blended composite
membrane for dehydration of ethanol-water mixture are examined. The relationships of flux
and separation factor with the feed concentration and operation temperature are
established. Using this correlated equation, the continuous-flow pervaporation process
about 500 kilolitres/year dehydrated ethanol is designed. The numbers of stage and reheater
are calculated by stage-by-stage method for two kinds of cascades: one with equal membrane
area and the other with 10℃C of temperature decrement per section. The results show that
when the numbers of stage and reheater are the same, the cascade with 10℃C of temperature
decrement has more advantages than that with equal membrane area. The influences of feed
concentration and flow rate on the numbers of stage and reheater in the cascades are
discnssed.

Key words: pervaporation, membrane separation, process design, alcohol dehydration