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US 5,707,532 AGranted
Methods of coagulating and decolorizing waste streams
AssigneeCytec Technology Corp.
InventorsGerald Guerro, Wendy L. DiNicola, Nicole Richards
Life of this patent
Estimating the term…
Abstract
Compositions comprising polyamine and melamine polymers in certain ratios are provided for coagulating suspended solids in wastewaters such as deinking process waters and raw waters.
Claims15
A method for reducing turbidity and color from a wastewater stream containing suspended solids and color bodies which comprises:
- (i) adding to said wastewater stream in an amount sufficient to coagulate said solids a composition comprising polyamine and melamine aldehyde acid colloid polymer in a ratio of about 90.0-99.9 parts by weight of polyamine to about 10.0-0.1 parts by weight of said acid colloid polymer;
- wherein said polyamine is a reaction product of a secondary amine and a difunctional epoxy compound or precursor thereof;
- and (ii) separating said solids from said wastewater stream.
A method for separating suspended solids and color bodies from deinking process waters resulting from the processing of recycle paper which comprises:
- (i) adding to said process water from about 0.5 to about 150 parts per million, based on said process water of a composition comprising a polyamine and a melamine formaldehyde acid colloid polymer in a ratio of about 96.5-99.9 parts by weight of polyamine to about 3.5-0.1 parts by weight of acid colloid polymer;
- wherein said polyamine is a reaction product of a secondary amine and a difunctional epoxy compound or precursor thereof;
- and (ii) separating said solids and said color bodies from said process water.
Dependencies are inferred from the claim text.