Method for removing an alkaline earth metal sulfate scale

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

1989-04-03

1992-03-03

Willis, Jr., Prince

Compositions

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

252 80, 252175, 252180, 134 2, 134 3, 210699, C02F 508, C23F 1110

Patent

active

050930206

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 also thio, amino, and hydroxy acetate 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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