Scale control in aqueous systems

Details Scale control in aqueous systems Scale control in aqueous systems

1993-03-30

1994-02-22

Hruskoci, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210700, 210701, 252180, C02F 514

Patent

active

052884104

ABSTRACT:
A composition and process for preventing the deposition of scale and sludge in aqueous systems comprising adding to the system the combination of three or more additives selected from the group consisting of a) polyacrylic acid, copolymer of alkylsulfonate and maleic anhydride and mixtures thereof, b) hydroxy ethylidene diphosphonic acid, amino (trimethyl phosphonic acid), diethylenetriamine pentaacetic acid, and mixtures thereof, and c) copolymer of styrene sulfonate and maleic anhydride, copolymer of acrylic acid and acrylamide, poly(acrylic acid-co-hypophosphite) and mixtures thereof, and wherein the combination contains at least one additive selected from each of a), b) and c).

REFERENCES:
patent: 3663448 (1972-05-01), Ralston
patent: 4159946 (1979-07-01), Smith et al.
patent: 4446045 (1984-05-01), Snyder et al.
patent: 4545920 (1985-10-01), Lorenc et al.
patent: 4576722 (1986-03-01), Gaylor et al.
patent: 4631131 (1986-12-01), Cuisia et al.
patent: 4640793 (1987-02-01), Persinski et al.
patent: 4663053 (1987-05-01), Geiger
patent: 4978456 (1990-12-01), Sprague

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