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Membrane Water Treatment
  Volume 8, Number 1, January 2017, pages 35-50
DOI: https://doi.org/10.12989/mwt.2017.8.1.035
 


Performance improvement of countercurrent-flow membrane gas absorption in a hollow fiber gas-liquid membrane contactor
Chii-Dong Ho, Yun-Jen Sung, Wei-Ting Chen and Feng-Chi Tsai

 
Abstract
    The theoretical membrane gas absorption module treatments in a hollow fiber gas-liquid membrane contactor using Happel\'s free surface model were obtained under countercurrent-flow operations. The analytical solutions were obtained using the separated variable method with an orthogonal expansion technique extended in power series. The CO2 concentration in the liquid absorbent, total absorption rate and absorption efficiency were calculated theoretically and experimentally with the liquid absorbent flow rate, gas feed flow rate and initial CO2 concentration in the gas feed as parameters. The improvements in device performance under countercurrent-flow operations to increase the absorption efficiency in a carbon dioxide and nitrogen gas feed mixture using a pure water liquid absorbent were achieved and compared with those in the concurrent-flow operation. Both good qualitative and quantitative agreements were achieved between the experimental results and theoretical predictions for countercurrent flow in a hollow fiber gas-liquid membrane contactor with accuracy of 6.62x10-2<-E<-8.98x10-2.
 
Key Words
    countercurrent flow; membrane gas absorption; hollow fiber module; conjugated Graetz problem
 
Address
Chii-Dong Ho, Yun-Jen Sung, Wei-Ting Chen and Feng-Chi Tsai:Energy and Opto-Electronic Materials Research Center, Department of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei, 251, Taiwan
 

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