Compositions containing phosphonoalkane carboxylic acid for scal

Details Compositions containing phosphonoalkane carboxylic acid for scal Compositions containing phosphonoalkane carboxylic acid for scal

1987-10-08

1988-11-15

Wax, Robert

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210701, 252180, C02F 514

Patent

active

047847743

ABSTRACT:
An antiscalant admixture is disclosed of a homopolymer of maleic acid or a copolymer and a phosphonoalkane carboxylic acid for reducing scaling in an aqueous system wherein the weight ratio of said copolymer to said phosphonic acid is 5:1 to 1:5, wherein molecular weight of said copolymer is 2,000 to 20,000, and wherein said polymer is composed of at least two of the comonomers selected from monounsaturated monocarboxylic and dicarboxylic acids of 3 to 5 carbon atoms, water-soluble salts thereof, and alkyl esters thereof of 1 to 6 carbon atoms in said alkyl groups; substituted acrylamides; acrylamidoalkane sulfonic acids and water-soluble salts thereof; vinyl sulfonic acid and water-soluble salts thereof; hydroxyalkyl acrylates with 2 to 4 carbons in the alkylene group; styrene sulfonic acids and water-soluble salts thereof; allyloxyhydroxyalkane sulfonic acids and water-soluble salts; vinyl carboxylates; polymerized vinyl alcohols and water-soluble salts thereof; and mixtures of such comonomers.

REFERENCES:
patent: 4432879 (1984-02-01), Greaves et al.
patent: 4532048 (1985-07-01), Amjad et al.
patent: 4575425 (1986-03-01), Boffardi et al.
patent: 4576722 (1986-03-01), Gaylor et al.
patent: 4600524 (1986-07-01), Cuisia et al.
patent: 4640793 (1987-02-01), Persinski et al.
patent: 4652377 (1987-03-01), Amjad
patent: 4711725 (1987-12-01), Amick et al.

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