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Mass transfer and heat transfer behavior of ethanol-water vapor in vacuum condensation dephlegmator during pervaporation membrane process

Authors： ZHANG Yin, WANG Dingding, LIU Jingyun, LIU Wenda, JIANG Haoji, HAN Lu, XIAO Zeyi, FAN Senqing

Units： School of Chemical Engineering, Sichuan University

KeyWords： pervaporation; ethanol-water vapor; vacuum dephlegmator; mass transfer; heat transfer

ClassificationCode：TQ026.2

year,volume(issue):pagination： 2024,44(5):142-149

Abstract：

Fractional condensation process was used to recover the permeate ethanolwater vapor downstream the pervaporation membrane under vacuum. The heat transfer and mass transfer behavior of the vacuum condensation dephlegmator was stressed. The effects of inlet vapor flow rate on the heat transfer coefficient and condensation behavior of the vacuum condensation dephlegmator were analyzed. When the inlet vapor flowing velocity was increased from 3.09 to 8.05 m/s, the heat transfer process was effectively intensified. The total heat transfer coefficient was increased from 37.06 to 145.27 W/(m2·K), with the vapor side condensing heat transfer coefficient also increasing from 55.81 to 544.60 W/(m2·K). At different flowing velocity, the proportion of thermal resistance in the heat transfer process varied. At low vapor flowing velocity, the vapor side thermal resistance was relatively high, reaching up to 82.99%. After the flow rate increased, the proportion of thermal resistance on the cooling medium side was increased, reaching up to 65.66%. With the increase in feed flowing velocity, the recovery proportion of ethanolwater vapor in the vacuum condensation dephlegmator was improved from 41.82% to 68.19%, with the ethanol recovery proportion increasing from 5.21% to 30.72%. The ethanol mass fraction in the first condensate was also increased from 3.45% to 10.66%.

Funds：

国家重点研发计划课题（2021YFC2101204）；中央高校基本科研业务费（20822041B4013和2023SCU12080）

AuthorIntro：

张尹（1998-），男，四川凉山人,硕士生，研究方向为膜过程设备设计.*通讯作者，E-mail：fansenqing86@scu.edu.cn

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