Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-11-05
1976-05-18
Schofer, Joseph L.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 21M, 260 22R, 210 37R, 210 38R, C08F25702
Patent
active
039576981
ABSTRACT:
Thermally reversible, amphoteric microbead matrix ion exchange resins of micron size particles of crosslinked, weak acid cation or weak base anion exchange resin embedded in a matrix of a weak ion exchange resin of opposite form are prepared by suspending micron size particles of a weak ion exchange resin in a mixture of monomers which can be converted to a crosslinked matrix polymer, polymerizing the monomers, and then converting the microbead-matrix resin into active ion exchange form with a particle size of about 0.074-4.00 mm. Preferably the resin has microbeads of crosslinked polyacrylic acid embedded in a matrix of polymerized vinylbenzyl chloride - divinylbenzene aminated with dimethyl amine. These amphoteric resins absorb salts from water in a thermally reversible manner with improved resin capacities and kinetics. They have particular utility in the desalination of brackish waters.
REFERENCES:
patent: 3041292 (1972-06-01), Hatch
patent: 3078140 (1963-02-01), Hatch
patent: 3332890 (1967-07-01), Hatch
patent: 3645922 (1972-02-01), Weiss et al.
patent: 3875085 (1975-04-01), Bolto
Kellom David B.
Kulkosky Peter F.
Schofer Joseph L.
The Dow Chemical Company
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