Barium sulfate removal and anti-deposition compositions and proc

Details Barium sulfate removal and anti-deposition compositions and proc Barium sulfate removal and anti-deposition compositions and proc

1986-11-24

1987-11-24

Wax, Robert A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

134 2, 134 2214, 134 2219, 134 42, 252 82, 252180, 252148, C02F 512

Patent

active

047088052

ABSTRACT:
The invention provides a process for the sequestration of barium sulfate scale and barium sulfate sequestrant compositions therefor comprising an aqueous solution of citric acid (CA), a polycarbazic acid (PA), and an alklyenepolyaminopolycarboxylic acid (APAPCA), the weight ratio of CA to APAPCA being in the range from about 0.5 to 1 to about 11 to 1 and the weight ratio of PCA to APAPCA being in the range from about 0.002 to about 0.2, wherein the polycarbazic acid has the formula (R).sub.2 --N--[CH.sub.2 CH.sub.2 N(R)].sub.m --R where R is the group CH.sub.2 --CO--NH--NH--COOH and m is 0 or an integer from 1 to about 4, and wherein the APAPCA has the formula (HOOC--CH.sub.2).sub.2 --N--[CH.sub.2 --CH.sub.2 --N(CH.sub.2 --COOH)].sub.n --CH.sub.2 COOH where n is an integer from 1 to about 4. The preferred aqueous sequestering solution has a pH in the range from about 9.5 to about 14, said pH being provided by a base selected from the group consisting of potassium hydroxide, potassium carbonate, and mixtures thereof.

REFERENCES:
patent: 3296027 (1967-01-01), Jacklin
patent: 3297580 (1967-01-01), Pitzer
patent: 3308065 (1967-03-01), Lesinski
patent: 3686123 (1972-08-01), Hiroshi
patent: 3859337 (1975-01-01), Herz et al.
patent: 4190462 (1980-02-01), De Jong et al.
patent: 4609757 (1986-09-01), D'Muhala et al.

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