Method of removing scale from wet oxidation treatment apparatus

Details Method of removing scale from wet oxidation treatment apparatus Method of removing scale from wet oxidation treatment apparatus

C - Chemistry, Metallurgy

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C02F 1/74 (2006.01) C02F 5/08 (2006.01) C02F 11/08 (2006.01) C09K 8/528 (2006.01) C23G 1/00 (2006.01)

Patent

CA 1276862

2086.063 METHOD OF REMOVING SCALE FROM WET OXIDATION TREATMENT APPARATUS ABSTRACT OF THE DISCLOSURE A method of removing scale from the surfaces of a fluid treatment apparatus by directing a base solution and an acid solution through the fluid treatment apparatus. The fluid treatment apparatus cleaned by the method of the present invention is a vertical tube wet oxidation treatment apparatus inwhich an aqueous slurry of organic materials is oxidized in a tube which extendsdeep into the surface of the earth. Water rinses are performed between the stepsof circulating the aqueous base solution, circulating the aqueous acid solution, and operating the fluid treatment apparatus. The water used for separating the sequential steps is preferably buffered water. The aqueous acid solution is preferably a mineral acid and most preferably nitric acid. The aqueous base solution is preferably potassium hydroxide or sodium hydroxide. The method also contemplates a sectional wash of the apparatus by directing a base or acid solution partially into the apparatus.

521210

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