Chemical modification of preformed polybenzimidazole semipermeable membrane
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United States of America Patent
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Jan 6, 1987
Issued Date -
N/A
app pub date -
Jul 6, 1982
filing date -
Sep 29, 1980
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Expired
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Abstract
A process for chemically modifying a preformed polybenzimidazole semipermeable membrane is provided. The process comprises the steps of sulfonating the membrane by contacting the membrane at a temperature within the range of 5.degree. C. to 100.degree. C. with a sulfonating agent and heating the membrane in an inert atmosphere at a temperature and for a period of time sufficient to convert the ionic bonds formed in the contacting step to permanent, covalent bonds, thereby providing a covalently bonded sulfonated polybenzimidazole semipermeable membrane. The membrane produced by the process of the present invention exhibits cation selectivity for electrodialysis and electrochemical applications. Other advantages may include increased water flux for reverse osmosis purposes and increased resistance to fouling.
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