Method of making thermally regenerable salt sorbent resins
AssigneeNovation Environmental Technologies, Inc.
InventorsRoger E. Johnson, Gerald Colombo
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Abstract
A heterogenous hybrid thermally regenerable salt sorbent resin is formed from a hybrid precursor resin. The hybrid precursor resin is formed by intimately mixing a dry, solid crosslinked macroporous copolymer with a solution containing a polyunsaturated monomer, a monoethylenically unsaturated monomer containing a haloalkyl group and a polymerization initiator, followed by heating to cause polymerization. The hybrid precursor resin is then treated with a weak base, then subjected to hydrolysis conditions to form, respectively, weak base groups and weak acid groups to produce the hybrid thermally regenerable salt sorbent resin.
Claims12
The method forming a precursor for a heterogenous thermally regenerable salt sorbent having two relatively independent phases by polymerizing in the presence of a host macroporous copolymer a first polyunsaturated monomer and a monoethylenically unsaturated monomer containing a haloalkyl group to form a guest crosslinked copolymer, wherein said host macroporous copolymer is formed from a second polyunsaturated monomer and a monoethylenically unsaturated monomer containing a functionality convertible to a weak acid, comprising the steps of
- (a) intimately mixing at a temperature less than about 40° C. a nonaqucous solution of said first polyunsaturated monomer, said monoethylenically unsaturated monomer containing a haloalkcyl group and a polymerization initiation reagent with said macroporous copolymer as a solid to imbibe said solution into said solid macroporous copolymer;
- and
- (b) heating the mixture formed in step (a) within the temperature range of about 70° C. to 100° C. for a period of time sufficient to polymerize said monomers to thereby form said precursor.
Dependencies are inferred from the claim text.