Descaler composition and method

Details Descaler composition and method Descaler composition and method

1983-02-08

1984-03-27

Kittle, John E.

Compositions

Dust suppressants for bulk materials, or processes of...

252 81, 252 82, 252142, 252143, 252175, 252178, 252180, 134 3, 134 41, 134 2219, C02F 508

Patent

active

044393393

ABSTRACT:
An aqueous acidizer composition and method of utilizing same in the removal of scale from fresh water production equipment such as desalinators or evaporators (watermakers) and distillation units as well as heat exchangers and boilers. The composition contains a blend of three acids of varying strengths carefully selected to provide a timed release effect. The acids which are employed include hydrochloric acid, dichloroacetic acid and acetic acid. The composition further contains a surfactant such as isopropyl alcohol which provides surfactant properties and also reacts with the acids, resulting in multiple equilibria in which the corresponding esters are formed. The composition also includes an acid-base indicator such as methyl orange to signify neutralization of the acidizer during use in scale removal. The present composition is particularly effective in removal of phosphate and carbonate scale as well as some sulfate scale. Other deposits containing basic anions are also removed.

REFERENCES:
patent: 1548495 (1925-08-01), Buhler
patent: 1742347 (1930-01-01), Fries
patent: 3607398 (1971-09-01), Lucas
patent: 4199469 (1980-04-01), Walzer
patent: 4246130 (1981-01-01), Koch

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