Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1994-05-09
1995-07-25
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
162 5, 162189, 210728, 210735, 210736, 210917, 210928, C02F 156
Patent
active
054359210
ABSTRACT:
The invention comprises a process for removing true and apparent color from pulp and paper waste waters. It comprises treating these waste waters with a coagulant and vinylamine polymer. The coagulant is selected from the group consisting of epichlorohydrin-dimethylamine, guanidine-formaldehyde condensation polymers, cyanoguanidine-formaldehyde condensation polymers, urea-formaldehyde condensation polymers, polyethyleneimines, polydiallyldimethylammonium chloride, copolymers of polydiallyldimethylammonium chloride and acrylamide, and ethylenedichloride-ammonia. The vinylamine polymer includes from about 1 to about 100 mole percent vinylamine and from about 1 to about 99 mole percent of at least one monomer selected from the group consisting of amidine vinylformamide, vinyl alcohol, vinyl acetate, vinyl pyrrolidinone and the esters, amides, nitriles and salts of acrylic acid and methacrylic acid.
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Collins John H.
Fong Dodd W.
Sommese Anthony G.
Tseng Amy M.
Drake James J.
Hruskoci Peter A.
Miller Robert A.
Nalco Chemical Company
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