Process for preparing gel-type cation exchangers
AssigneesBayer Aktiengesellschaft, Sybron Chemicals, Inc.
InventorsGeorge L. Dimotsis, Wolfgang Podszun, Reinhold Klipper
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Abstract
The invention relates to a process for preparing gel-type cation exchangers of high stability by sulfonation of crosslinked (meth)acrylic ester-containing bead polymers with sulfuric acid having a concentration of 90 to 95% in the absence of a swelling agent.
Claims9
A process for preparing gel-type cation exchangers of high stability comprising sulfonating a (meth)acrylic ester-containing crosslinked bead polymer in the absence of swelling agent using a sulfuric acid having a concentration of from 90 to 95%, wherein the temperature during the sulfonation is increased by the heat of reaction and/or heat of dilution that occurs during the reaction up to an end temperature of 150 to 170° C.
A gel-type cation exchanger of high stability obtained by sulfonation of a (meth)acrylic ester-containing crosslinked bead polymer in the absence of a swelling agent using sulfuric acid having a concentration of 90 to 95%, during which sulfonation the temperature is increased by the heat of reaction and/or heat of dilution that occurs up to a final temperature of 150 to 170° C.
Dependencies are inferred from the claim text.