A Method to Obtain Gas-PDMS Membrane Interaction Parameters for UNIQUAC Model

The recovery or capture of one or more components from gas mixture by membrane separation has become a research focus in recent years.This study investigates the gas-membrane solution equilibrium,for which Henry’s law is not applicable if the gas phase is a mixture.This problem can be solved by usin...

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Published inChinese journal of chemical engineering Vol. 21; no. 5; pp. 485 - 493
Main Author 林东杰 丁忠伟 刘丽英 马润宇
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2013
Subjects
Activity coefficients
Chemical engineering
diffusion coefficient
Dissolution
Feasibility
Fittings
Interaction parameters
Mathematical models
Membranes
Nonlinearity
PDMS膜
polydimethylsiloxane (PDMS) membrane
Separation
Solubility
solubility coefficient
UNIQUAC model
UNIQUAC模型
天然气
气体混合物
溶液平衡
溶解度系数
相互作用参数
聚二甲基硅氧烷
polydimethylsiloxane (PDMS) membrane
UNIQUAC model
solubility coefficient
diffusion coefficient
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ISSN1004-9541
2210-321X
DOI10.1016/S1004-9541(13)60513-3

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Summary:The recovery or capture of one or more components from gas mixture by membrane separation has become a research focus in recent years.This study investigates the gas-membrane solution equilibrium,for which Henry’s law is not applicable if the gas phase is a mixture.This problem can be solved by using UNIQUAC model to calculate the activity coefficient of gas dissolved in the membrane.A method was proposed in this study to obtain the gas-membrane interaction parameter for UNIQUAC model.By the experiments of gas permeation through polydimethylsiloxane PDMS membrane,the solubility coefficients of some gases（N2,CO2,CH4） were measured.Through non-linear fitting UNIQUAC model to the experimental results from this study and in literature（H2,O2,C3H8）,the gas-membrane interaction parameters for these gases were obtained.Based on these parameters,the activity coefficients of the dissolved gas were calculated by UNIQUAC model,and their values agree well with the experimental data.These results confirm the feasibility and effectiveness of the proposed method,which makes it possible to better predict gas-membrane solution equilibrium.
Bibliography:diffusion coefficient;solubility coefficient;polydimethylsiloxane（PDMS） membrane;UNIQUAC model
LIN Dongjie 1,2,DING Zhongwei1,2,＊,LIU Liying1,2 and MA Runyu 1,2 1 College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China 2 Beijing Key Laboratory of Membrane Science and Technology,Beijing University of Chemical Technology,Beijing 100029,China
The recovery or capture of one or more components from gas mixture by membrane separation has become a research focus in recent years.This study investigates the gas-membrane solution equilibrium,for which Henry’s law is not applicable if the gas phase is a mixture.This problem can be solved by using UNIQUAC model to calculate the activity coefficient of gas dissolved in the membrane.A method was proposed in this study to obtain the gas-membrane interaction parameter for UNIQUAC model.By the experiments of gas permeation through polydimethylsiloxane PDMS membrane,the solubility coefficients of some gases（N2,CO2,CH4） were measured.Through non-linear fitting UNIQUAC model to the experimental results from this study and in literature（H2,O2,C3H8）,the gas-membrane interaction parameters for these gases were obtained.Based on these parameters,the activity coefficients of the dissolved gas were calculated by UNIQUAC model,and their values agree well with the experimental data.These results confirm the feasibility and effectiveness of the proposed method,which makes it possible to better predict gas-membrane solution equilibrium.
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ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(13)60513-3