Method for preparation of strong acid cation exchange resins
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United States of America Patent
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Aug 31, 2004
Grant Date -
Jan 23, 2003
app pub date -
May 30, 2002
filing date -
Jun 22, 2001
priority date (Note) -
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Abstract
An improved process for preparing strong acid cation exchange resins by sulfonation of wet crosslinked copolymer in the absence of organic swelling solvents is disclosed. This process involves dewatering a crosslinked poly(vinylaromatic) copolymer to selected residual moisture levels of 3 to 35%, followed by non-solvent sulfonation, to provide strong acid cation exchange resins having enhanced physical stability and that are free of chlorinated-solvent contaminants.
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