COMPOUND FOR CLEANING SURFACES FROM DEPOSITS OF SALTS, OXIDES AND HYDROXIDES OF METALS (VERSIONS) Russian patent published in 2005 - IPC

FIELD: chemical cleaning of surfaces from scale, corrosion products and various salted-out deposits; production of updated compound for cleaning surfaces.

SUBSTANCE: proposed compound is made on base of solid active acid component which is just carbamide salt; nitrate, or muriate, or sulfate, or phosphate, or fluoride, or oxalate, or carbamide ammonium nitrate or mixture of these salts may be used as active acid component; when carbamide is used at ratio more than 1:1 in stoichiometry as compared with acid but not exceeding amount of carbamide by mass by more than 50% required for complete neutralization of acid. Proposed compound is just carbamide salt with active acid component if form of nitrate, or muriate, or sulfate, or phosphate, or fluoride, or oxalate, or carbamide ammonium nitrate or mixture of these salts when acid bonding carbamide is used in the amount not exceeding 1:1 in stoichiometry as compared with carbamide but not exceeding amount required for retaining aggregate state of solid acid component. Proposed component possesses low activity when it is used for cleaning badly corroded surfaces and high activity for cleaning slightly corroded surfaces.

EFFECT: extended field of application; ease in handling; enhanced safety of handling.

3 cl, 2 tbl, 2 ex