Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Patent
1991-08-07
1993-03-02
Cooper, Jack
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
210698, 210638, 252 80, 252 82, 252180, 166312, B01D 1700, C02F 126, C02F 510
Patent
active
051906562
ABSTRACT:
A liquid membrane method for removing scale deposits wherein a novel chelating composition is utilized. The composition used in the external and internal aqueous phases of said membrane comprises an aqueous solution having a pH of about 8 to about 14, and an aminocarboxylic acid or polyamine chelant. Additionally, a catalyst or synergist is used in the external phase only. Preferred chelants comprise diethylenetriamine pentaacetic acid (DTPA) or ethylenediaminetetraacetic acid (EDTA) or alkali salts thereof. Anions of organic and inorganic acids comprise the catalyst used in the external phase. Catalysts which can be used include fluoride, oxalate, persulfate, dithionate, hypochlorite, formate, 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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Morris Richard L.
Paul James M.
Cooper Jack
Malone C. A.
McKillop A. J.
Mobil Oil Corporation
Silbermann J. M.
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