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US 2009/0156798 A1Published application
Process for producing cation exchangers
AssigneeLANXESS Deutschland GmbH
InventorsPierre Vanhoorne, Hans-Jurgen Wedemeyer
Life of this patent
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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.
Claims8
Strongly acidic cation exchangers obtained by sulfonating bead polymers formed from vinylaromatic monomers, crosslinkers and from 0.2 to 20% by weight of vinyl ethers and/or vinyl esters.
A process for producing strongly acidic cation exchangers, wherein:
- a) monodisperse or heterodisperse bead polymers are prepared from vinylaromatic monomers, crosslinkers and from 0.2 to 20% by weight of vinyl ethers and/or vinyl esters by suspension polymerization and
- b) these bead polymers are converted to strongly acidic cation exchangers by the action of sulfuric acid, sulfur trioxide and/or chlorosulfonic acid.
Dependencies are inferred from the claim text.