Method for inhibiting scale

Details Method for inhibiting scale Method for inhibiting scale

1985-09-10

1986-12-23

Hruskoci, Peter

Liquid purification or separation

Processes

Preventing, decreasing, or delaying precipitation,...

210698, 210699, 252180, 252181, C02F 514

Patent

active

046311319

ABSTRACT:
The accumulation of scale in an aqueous system is inhibited by the addition of a copolymer of maleic acid or anhydride or fumaric acid and allyl sulfonic acid and a water soluble organic phosphonic acid such as aminotri(methylene phosphonic acid), ethylenediaminetetra(methylene phosphonic acid), hydroxyethylidene diphosphonic acid and 2-phosphonobutane tricarboxylic acid-1,2,4 or water soluble salts thereof. Scale can actually be removed by the addition of these materials to pressurized boiler water systems. Allyl or vinyl copolymers, a phosphonate, and optionally a water soluble, hardness precipitating agent such as a carbonate or a phosphate may be used when treating pressurized boilers to provide an in-service cleaning effect.

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patent: 4442009 (1984-04-01), O'Leary et al.
patent: 4581145 (1986-04-01), Cuisia et al.

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