Method of removing iron and copper-containing scale from a metal

Details Method of removing iron and copper-containing scale from a metal Method of removing iron and copper-containing scale from a metal

1985-11-27

1987-05-19

Hruskoci, Peter

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 3, 134 28, 134 41, 252 82, 252 87, C23G 118

Patent

active

046665285

ABSTRACT:
A method of removing iron and copper containing scale from a metal surface by contacting the scale with a composition comprising an admixture of an aminopolycarboxylic acid, such as ethylenediaminetetraacetic acid (EDTA), or the alkali metal salts or ammonium salts or amine salts of the aminopolycarboxylic acid and a phosphonic acid such as aminotrimethylenephosphonic acid (ATMP), or an alkali metal salt or amine salt or ammonium salt of the phosphonic acid. The aminopolycarboxylic acid or salt thereof and phosphonic acid of salt thereof are present in the composition in an amount sufficient to provide a molar ratio of aminopolycarboxylic acid to phosphonic acid in the range of from about 1:9 to about 39:1.

REFERENCES:
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patent: 3996062 (1976-11-01), Frost et al.
patent: 4387027 (1983-06-01), May et al.
patent: 4452643 (1984-06-01), Martin et al.
patent: 4578162 (1986-03-01), McIntyre et al.

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