Process for the preparation of free-flowing strongly acidic cation exchangers

US6624206B2 · kind B2 · utility

Assignee

• IAB Ionenaustauscher GmbH Bitterfeld · DE

Inventors

• Reinhard Bachmann · Bad Kötzting, DE
• Lothar Feistel · Delitzsch, DE
• Rudiger Seidel · Sandersdorf, DE
• Karl-Heinz Siekiera · Wolfen, DE
• Kurt Wegewitz · Bitterfeld-Wolfen, DE

Key dates

• Filing date: Feb 11, 2002
• Grant date: Sep 23, 2003
• Expiry date: Feb 11, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2800/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to processes for the preparation of free-flowing end products of strongly acidic cation exchangers. In the case of the strongly acidic cation exchangers prepared by the processes described in Patent Application P 195 48 012.0, the particle beds of the end products are not free-flowing. By additions of wetting agents or water-soluble initiators or surfactants in the polymerization stage or after the filtration of the end product and/or process engineering means, a permanent or temporary free flowability of the particle beds of the strongly acidic cation exchangers is achieved using the following processes. 1. By additions ofknown wetting agents in amounts of 0.25 g/l of aqueous phase orwater-soluble initiators in amounts of 0.05 to 20 g/l of aqueous phaseto the copolymerization system 20 minutes to 120 minutes after reaching the gel point. 2. By treatment of the strongly acidic cation exchangers with aqueous solutions of surface-active substances having a content of 0.1 to 5 g/l in the batch or column process. 3. By washing the strongly acidic cation exchangers for 1 to 4 hours with hot water at at least 60° C., subsequently separating off the water and dry…