Method for inhibiting scale formation using calcium hypochlorite

Details Method for inhibiting scale formation using calcium hypochlorite Method for inhibiting scale formation using calcium hypochlorite

1989-10-10

1991-04-02

Hruskoci, Peter

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210756, 210764, C02F 176

Patent

active

050045490

ABSTRACT:
A solid calcium hypochlorite composition contains hydrated calcium hypochlorite and an alkali metal salt of phosphonobutane polycarboxylic acid having an available chlorine concentration of at least 50 percent by weight and a water content of at least 4 percent by weight.
It has been found that the use of the novel compositions of the present invention can significantly reduce scale formation in dispensers for calcium hypochlorite particularly where water having high total alkalinity is used. The prevention or inhibition of scale formation is accomplished without harmfully affecting other properties of the pool water such as the pH.

REFERENCES:
patent: 3886205 (1975-05-01), Geffers et al.
patent: 4087360 (1978-05-01), Faust et al.
patent: 4780216 (1988-10-01), Wojtowicz
patent: 4935065 (1990-06-01), Bull
Kirk-Othmer Encyclopedia of Chemical Technology, 3rd Edition, vol. 21, pp. 82-89, (NY-John Wiley 1983).

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