A modified entropic expression for the analysis of swelling behavior of polymeric membranes in solutions

Liu, Qing Lin; Cheng, Zhen

doi:10.1016/j.polymer.2005.06.112

Cited by 1 publication

(2 citation statements)

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“…Then, the method in literature [23][24][25][26] is adopted to measure the permeability coefficients, diffusion coefficients and solubility coefficients of pure nitrogen, carbon dioxide and methane permeating through PDMS membrane separately. The advantage of UNIQUAC model in predicting the activity coefficient for gas-membrane system has been proved by previous studies [27][28][29][30]. In this study, by non-linear fitting UNIQUAC model to the experimental results, the gas-membrane interaction parameter will be obtained.…”

Section: Introductionmentioning

confidence: 85%

“…Previous studies have revealed that the process is controlled by the solution of gas in the membrane [15]. UNIQUAC model can be applied to calculate the activity coefficient of component i dissolving in membrane [27][28][29][30] and it includes the influence of interaction between different components by introducing interaction parameters. UNIQUAC model describes the activity coefficient of component i as the sum of a combinatorial part ( C i γ ) and a residual part…”

Section: Uniquac Modelmentioning

confidence: 99%

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

Lin

Ding

Liu

et al. 2013

Chinese Journal of Chemical Engineering

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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 (N 2 , CO 2 , CH 4) were measured. Through non-linear fitting UNIQUAC model to the experimental results from this study and in literature (H 2 , O 2 , C 3 H 8), 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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