Composition for removing an alkaline earth metal sulfate scale

Details Composition for removing an alkaline earth metal sulfate scale Composition for removing an alkaline earth metal sulfate scale

1991-09-27

1994-02-01

Willis, Jr., Prince

Compositions

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

252175, 252180, 252 8551, C02F 510

Patent

active

052829952

ABSTRACT:
A method and composition for removing barium and strontium sulfate scale deposits. The composition comprises an aqueous solution having a pH of about 8 to about 14, an EDTA or DTPA chelant, and a catalyst or synergist. Preferred chelants comprise diethylenetriaminepentaacetic acid (DTPA) or ethylenediaminetetraacetic acid (EDTA or alkali salts thereof. Anions of organic and inorganic acids comprise the catalyst. Catalysts which can be used include fluoride, oxalate, persulfate, dithionate, hypochlorite and formate anions. When the solution containing the composition is contacted with a surface containing a scale deposit, the deposit dissolves substantially more scale quicker than heretofore possible.

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Hawleys Condensed Chemical Dictionary, 11th ed., Van Nostrand Reinhold, NY 1987, pp. 391, 486.

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