On the effects of plasticization in CO2/light gas separation using polymeric solubility selective membranes

Autor: DC Kitty Nijmeijer, Cláudio P. Ribeiro, SR Sander Reijerkerk, Matthias Wessling, Benny D. Freeman
Přispěvatelé: Membrane Science & Technology
Rok vydání: 2011
Předmět:
Zdroj: Journal of membrane science, 367(1-2), 33-44. Elsevier
ISSN: 0376-7388
DOI: 10.1016/j.memsci.2010.10.035
Popis: This paper reports pure and mixed gas CO 2 /H 2 and CO 2 /CH 4 membrane separation performance of a highly permeable poly(ethylene oxide) based multi-block copolymer. Permeation and sorption properties have been studied over a wide temperature (−10 °C to +35 °C) and pressure range (up to 25 bar partial pressure of CO 2 ). In particular, we address the effect of plasticization by CO 2 . A strong dependency of CO 2 permeability on CO 2 concentration in the polymer matrix was observed in pure and mixed gas experiments. Plasticization effects increased the permeability of H 2 and CH 4 in mixed gas experiments compared to their pure gas values. The H 2 permeability was less influenced by plasticization than the CH 4 permeability due to H 2 's smaller kinetic diameter. As a result, mixed gas selectivities were systematically lower than pure gas selectivities. This difference between mixed and pure gas selectivity is exclusively dependent on the CO 2 concentration in the polymer matrix, which can change with temperature or CO 2 fugacity. Remarkably, the difference between ideal selectivity and mixed gas selectivity scales linearly with the CO 2 concentration in the polymer for all pressures and temperatures considered.
Databáze: OpenAIRE
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