Patent ID: 6846452
Filing Date: 2005-01-25
Classification: C02F

Abstract:
1. A process for inhibiting complex scale in an aqueous system containing silica, which comprises, adding to an aqueous system containing silica an effective silica scale inhibiting amount of a scale inhibiting composition comprising: (a) 2-phosphonobutane-1,2,4- tricarboxylic acid, and (b) a copolymer comprising (1) one or more allyloxybenzenesulfonate monomers, and (2) one or more water-soluble acrylic monomers, substituted acrylic monomers, or mixtures thereof, where the mole ratio of (1) to (2) is from 1:99 to 20:80, and such that the weight ratio of (a) to (b) is from 20:1 to 1:20.