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US 2012/0238649 A1Published application
Process for producing cation exchangers
AssigneeLANXESS Deutschland GmbH
InventorsPierre Vanhoorne, Hans-Jürgen Wedemeyer
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Abstract
Strongly acidic cation exchangers with high mechanical, osmotic and oxidation stability can be prepared by sulfonating bead polymers formed from one or more vinylaromatic monomer(s), one or more crosslinker(s) and from 0.2 to 20% by weight of one or more vinyl ethers and/or vinyl esters.
Claims11
Strongly acidic cation exchangers obtained by reacting:
- a vinylaromatic monomer,
- a crosslinker, and
- from 0.2 to 20 percent by weight of a divinyl ether, thereby forming bead polymers;
- and
- subsequently sulfonating said bead polymers.
2 more elements
A process for producing strongly acidic cation exchangers, comprising:
- a) suspension polymerization of a vinylaromatic monomer, a crosslinker, and from 0.2 to 20% by weight of a divinyl ether, thereby forming bead polymers;
- and
- b) reacting said bead polymers with sulfuric acid, sulfur trioxide and/or chlorosulfonic acid, thereby forming the strongly acidic cation exchangers.
Dependencies are inferred from the claim text.