Patent ID: 7235180
Filing Date: 2007-06-26
Classification: B01J

Abstract:
1. A method of treating an aqueous fluid to substantially reduce the concentration of dissolved salts comprising sulfates contained therein, comprising the steps of: (a) contacting a first volume of said aqueous fluid with a mass of sulfate-specific basic anion exchange resin containing basic groups selected from the group consisting of triethylaamine, tributylamine and combinations thereof; (b) then contacting said first volume of said fluid within a first temperature range with a mass of thermally regenerable hybrid salt sorbent resin having two relatively independent phases comprising a first phase comprising a host macroporous copolymer of a polyunsaturated monomer and a monoethylenically unsaturated monomer containing weak acid groups and further comprising a second phase comprising a crosslinked guest copolymer of a polyunsaturated monomer and a monoethylenically unsaturated monomer containing weak base groups; wherein the pores of said host macroporous copolymer of said first phase are at least partially filled with said guest copolymer of said second phase; (c) collecting said first volume from said hybrid salt sorbent resin.