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Infinite dilute activity coefficients and diffusion coefficients in PTFEP by inverse gas chromatography

Authors： ZHANG Wei1, YANG Zhengjin2, WANG Naixin1, JI Shulan2, LI Jiding2

Units： 1. College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China; 2. Department of Chemical Engineering, Tsinghua University, Beijing 10084, China

KeyWords： pervaporation; infinite dilute activity coefficients; infinite dilute diffusion coefficients; inverse gas chromatography; poly[bis(trifluoroethoxy)phosphazene]

ClassificationCode：O642.2; O643

year,volume(issue):pagination： 2015,35(5):18-23

Abstract：

Inverse gas chromatography (IGC) is a fast and reliable technique to measure the solvent-polymer interplay. In this study, the infinite dilute activity coefficients and infinite dilute diffusion coefficients of n-heptane, thiophene, 2-methylthiophene, 2, 5-dimethylphene and ethyl sulfide in poly[bis(trifluoroethoxy)phosphazene] (PTFEP) were determined in the temperature ranging from 353.15 K to 373.15 K with an increment of 5 K. The infinite dilute selectivity were measured from the experimental data, the pre-exponential factor and activation energy were also obtained according to Arrhenius equation. The experiment results showed that higher temperatures would accelerate the diffusion rate and also increase the sorption on membrane surface. And the diffusion through the membranes was affected by sizes of solvent molecules and the interactions between solvents and polymer. The obtained data would be assistance to the study of transferring mechanism in PTFEP membranes.

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