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US 5,627,145 AGranted
Composition and method for controlling phosphonates tending to precipitate metal ions in water
AssigneeBetzDearborn Inc.
InventorPeter K. L. G. Thevissen
Life of this patent
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Abstract
A method for controlling phosphonates which tend to precipitate with metal ions in water treatment operations comprising, adding to the water a water-soluble copolymer containing one or more of the following monomeric units: ##STR1## in which: R is hydrogen or an alkyl group, R.sub.1 is an alkyl group and X is hydrogen, NH.sub.4.sup.+, a water soluble metal ion or organic base; and [b] a monocarboxylic acid monomer; and adding the copolymer to the water to be treated in an amount sufficient to prevent precipitation of said phosphonates.
Claims10
A composition of matter, comprising;
- a water soluble copolymer having a molecular weight from about 500 to about 100,000 containing the following monomeric units (a) and b):
- ##STR4## in which:
- R is hydrogen, or an alkyl group,
- R.sub.1 is an alkylene group and
- X is hydrogen, NH.sup.+.sub.4, a water soluble metal ion or an organic base;
- and
- (b) a monocarboxylic acid monomer selected from the group consisting of acrylic acid and methacrylic acid.
4 more elements
A composition of matter, comprising:
- an aqueous phosphonate containing solution of a copolymer having a molecular weight from about 500 to about 100,000 wherein the concentration of the copolymer in the solution is within the range 0.1 to 100 ppm and wherein the copolymer contains the following monomeric units (a) and (b):
- ##STR5## in which:
- R is hydrogen, or an alkyl group,
- R.sub.1 is an alkylene group and
- X is hydrogen, NH.sup.+.sub.4, a water soluble metal ion or an organic base;
- and
- (b) a monocarboxylic acid monomer selected from the group consisting of acrylic acid and methacrylic acid.
4 more elements
Dependencies are inferred from the claim text.