Method of controlling manganese deposition in open recirculating

Details Method of controlling manganese deposition in open recirculating Method of controlling manganese deposition in open recirculating

1989-02-01

1990-02-13

Hruskoci, Peter

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210700, 210701, 252180, C02F 514

Patent

active

049004514

ABSTRACT:
A method of inhibiting manganese deposition in open, recirculating aqueous systems is disclosed. A water soluble acrylic acid/allyl hydroxy propyl sulfonate ether copolymer having repeat units characterized by the structural formula: ##STR1## wherein M is a water soluble cation, the molar ratio x:y is from about 3:1 to about 6:1 and the number average molecular weight of the copolymer is from about 5,000 to about 10,000, preferrably with an organic phosphonate is added to the aqueous system. The organic phosphonate is preferably hydroxy ethylidene diphosphonic acid, diethylene triamine penta-(methylene phosphonic acid) or blends thereof. The copolymer or copolymer and phosphonic acid is effective in inhibiting the deposition of manganese in aqueous systems.

REFERENCES:
patent: 2847477 (1958-08-01), Watanabe et al.
patent: 4552665 (1985-11-01), Ralston et al.
patent: 4560481 (1985-12-01), Hollander
patent: 4640818 (1987-02-01), Grierson et al.
patent: 4659481 (1987-04-01), Chen
patent: 4659482 (1987-04-01), Chen
patent: 4671880 (1987-06-01), Wisener et al.
patent: 4784774 (1988-11-01), Amjad et al.
Morris et al., "Manganese Deposits in Utility Condensers-Experience Report, Electric Power Research Institute Symposium Paper, Lake Buena"Vista, Fla. Jun. 18-20, 1985.

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