Process for preparing selective ion exchangers
AssigneeBayer Aktiengesellschaft
InventorsHolger Lütjens, Klaus Rall, Axel Ingendoh, Reinhold Klipper
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Abstract
The present invention relates to a process for preparing selective ion exchangers based on crosslinked vinylaromatic polymers and containing iminoacetic acid units of the general formulas (I) and (II) wherein X represents hydrogen or an alkali metal ion, by reacting a weak-base anion exchanger bearing primary amino groups with monochloro-acetic acid and/or an alkali metal salt of monochloroacetic acid at a temperature of from 70 to 110° C. and a pH of from 7 to 11.
Claims5
A process for preparing selective ion exchangers based on crosslinked vinylaromatic polymers and containing iminoacetic acid units of formula (I)
- and/or iminoacetic acid units of formula (II)
- wherein X represents hydrogen or an alkali metal ion, comprising reacting a weak-base anion exchanger bearing primary amino groups with 1.90 to 2.40 mol of monochloroacetic acid and/or an alkali metal salt of monochloroacetic acid per mol of the primary amino groups at a temperature of from 70 to 110° C. and a pH of from 7 to 11.
Dependencies are inferred from the claim text.