Patent ID: 8382989
Filing Date: 2013-02-26
Classification: B01D,B01J,C02F

Abstract:
1. A process for separating a charged species from an aqueous system, wherein the process comprises the following steps: (a) contacting a first aqueous system comprising the charged species at a first temperature with an ampholytic polymeric system comprising cationic and anionic groups, wherein the charged species is bonded to the ampholytic polymeric system; and (b) contacting the ampholytic polymeric system with a second aqueous system at a second temperature less than 60° C., wherein the charged species is released to the second aqueous system, and wherein the second temperature is higher than the first temperature; and wherein the ampholytic polymeric system is an interpenetrating network or a semi-interpenetrating network; the interpenetrating network or the semi-interpenetrating network comprising a cationic monomer and an anionic monomer, wherein the molar ratio of cationic monomers to anionic monomers is in the range of 5:1 to 1:5, wherein the cationic monomer has the formula: wherein: R is selected from the group consisting of H and CH wherein the cationic monomer has the formula: wherein R is selected from the group consisting of H and CH