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US 4,226,673 AGranted
Color removal from paper and pulp mill aqueous effluents
AssigneeChampion International Corporation
InventorHenry A. Fremont
Life of this patent
Estimating the term…
Abstract
An improved method for removal of color bodies from aqueous effluents from paper and pulp mill manufacturing operations by ultrafiltration wherein the semi-permeable membrane utilized is a polyethyleneimine coated polysulfone film.
Claims5
The method of removing color bodies present in an aqueous effluent from paper and pulp mill manufacturing operations comprising subjecting said effluent having a pH of about 11.5 and a temperature of 135.degree. F. to ultrafiltration through a semi-permeable membrane consisting of polysulfone film coated with polyethyleneimine.
Dependencies are inferred from the claim text.