Method of inhibiting scale formation

Details Method of inhibiting scale formation Method of inhibiting scale formation

1999-08-19

2000-11-14

Hruskoci, Peter A.

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210739, 210756, 252181, C02F 176

Patent

active

061465380

ABSTRACT:
The present invention relates to the addition of an alkali salt form or a precipitated alkali salt form of a PESA, polymaleic acid or mixture thereof, which is added, directly and/or indirectly, to an oxidizer, e.g. calcium hypochlorite, to inhibit formation of scale, particularly calcium carbonate scale, when the oxidizer contacts water containing carbonate alkalinity. This provides effective inhibition of calcium carbonate in and on oxidizer feed equipment. Process efficiency is greatly enhanced by selecting, as the limiting factor, the concentration of alkalinity present that can be converted to carbonate ions (the carbonate alkalinity). Optimization of the feedrate of polymer based on the carbonate alkalinity results in effective scale inhibition at an LSI value greater than 3.5.

REFERENCES:
patent: 4087360 (1978-05-01), Faust et al.
patent: 4416785 (1983-11-01), Menke et al.
patent: 4654159 (1987-03-01), Bush et al.
patent: 5062962 (1991-11-01), Brown et al.
patent: 5171451 (1992-12-01), Khambatta et al.
patent: 5518629 (1996-05-01), Perez et al.

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