Treatment of aqueous systems

Details Treatment of aqueous systems Treatment of aqueous systems

C - Chemistry, Metallurgy

02

F

134/39

C02F 5/12 (2006.01)

Patent

CA 1203451

A B S T R A C T TREATMENT OF AQUEOUS SYSTEMS A method of inhibiting and removing scale in an aqueous system is described which comprises incorporating in the water at least one amino carboxylate having the formula: RN[-(CH2)x-Z]2 in which x is 1 or 2, R represents -(CH2)x-Z or -CH2CH2N[- (CH2)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: Image wherein R1 represents hydrogen, lower alkyl or -CH2COOH, R2 represents hydrogen or lower alkyl, X represents -COOH and Z represents hydrogen or -COOH, or X and Z together represent -CO-0-CO-, and Y represents -SO3H, -C6H5 SO3H (para) or -CONHQ(R3)(R4) SO3H in which Q represents -CH2- or -CH2-CH2- and R3 and R4 independently represent hydrogen, phenyl, substituted phenyl, C 1-12 linear or branched alkyl or C 3-12 cycloalkyl, or a salt thereof.

409481

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