Liquid purification or separation – Processes – Chemical treatment
Patent
1986-03-24
1987-09-08
Hruskoci, Peter
Liquid purification or separation
Processes
Chemical treatment
134 3, 134 2213, 134 28, 134 29, 134 41, C02F 174
Patent
active
046922520
ABSTRACT:
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 in which an aqueous slurry of organic materials is oxidized in a tube which extends deep into the surface of the earth. Water rinses are performed between the steps of 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.
REFERENCES:
patent: 3072502 (1963-01-01), Alfano
patent: 3522093 (1970-07-01), Woolman
patent: 4139461 (1979-02-01), Bauer
patent: 4272383 (1981-06-01), McGrew
patent: 4328106 (1982-05-01), Harrar et al.
Atwood Mark T.
Carlson Frank
Peterscheck Hermann
Hruskoci Peter
VerTech Treatment Systems, Inc.
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