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Supercritical carbon dioxide extraction in membrane formation by thermally induced phase separation
Author(s) -
Zhang ChunFang,
Zhu BaoKu,
Ji GenLiang,
Xu YouYi
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.24620
Subject(s) - extraction (chemistry) , membrane , supercritical carbon dioxide , microporous material , chemical engineering , materials science , carbon dioxide , solvent , chromatography , supercritical fluid , supercritical fluid extraction , volume fraction , chemistry , organic chemistry , composite material , engineering , biochemistry
In this study, a novel and environmentally friendly extracting method, supercritical carbon dioxide (SC‐CO 2 ) extraction, was investigated in the thermally induced phase separation (TIPS) process for making microporous membranes. In the SC‐CO 2 extraction, the effects of extraction time, pressure, and temperature on the extraction fraction, membrane morphology, and membrane performance were investigated. It was concluded that with extraction conditions of 18 MPa, 35°C and 2 h, the porous membrane had the highest extraction fraction. There was a close relationship between membrane performance and the extraction conditions of SC‐CO 2 , and it is possible to tailor membrane performance through the choice of extraction conditions. Compared with traditional solvent extraction, a dry membrane treated by SC‐CO 2 extraction has much less shrinkage and greater water permeability, whereas the degree of crystallization of a membrane extracted by SC‐CO 2 is slightly greater than that extracted by ethanol. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1632–1639, 2007
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