Treatment of aqueous systems

Abstract

Abstract A method of inhibiting and preventing scale in an aqueous system is described which comprises incorporating in the water at least one amino carboxylate having the formula: RN[--(CH.sub.2).sub.x --Z].sub.2 in which x is 1 or 2, R represents --(CH 2 ) x --Z or --CH 2 CH 2 N[--(CH 2 ) x --Z] 2 and Z represents a --COOH group, or a salt thereof, and at least one water-soluble copolymer possessing recurring units of the formula: ##STR1## wherein R 1 represents hydrogen, lower alkyl or --CH 2 COOH, R 2 represents hydrogen or lower alkyl, X represents --COOH and Z represents hydrogen or --COOH, or X and Z together represent --CO--O--CO--, and Y represents --SO 3 H, --C 6 H 5 SO 3 H (para) or --CONHQ(R 3 )(R 4 ) SO 3 H in which Q represents --CH 2 -- or --CH 2 --CH 2 -- and R 3 and R 4 independently represent hydrogen, phenyl, substituted phenyl, C 1-12 linear or branched alkyl or C 3-12 cycloalkyl, or a salt thereof.

Inventors

• 👤 John J. Bennison
• 👤 Stuart W. Longworth
• 👤 John G. Baker

Bibliographic Details