Patent ID: 6646017
Filing Date: 2003-11-11
Classification: B01J,C08F

Abstract:
Process for the preparation of strongly acid cation exchangers having a particle size of 50 to 2000 &mgr;m comprising sulphonating crosslinked styrene polymers under an inert gas atmosphere at a temperature ranging from 130 to 150Â° C. with chlorosulphonic acid, sulphuric acid or sulphuric acid monohydrate, in the presence of a swelling agent selected from the group consisting of chlorinated aliphatic and aromatic hydrocarbons, for a time sufficient to produce cation exchangers which, when washed with 3 bed volumes of deionised waiter at a rate of 0.2 bed volumes per hour through a column containing 100 ml of said cation exchangers, at a temperature sufficient to produce an elutate having a temperature of 70Â° C., have a conductivity profile of less than 50 &mgr;S/cm.