Decolorization of effluents from pulp mills
AssigneeRohm and Haas Company
InventorSteven L. Rock
Life of this patent
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Abstract
Pulp mill effluents particularly unbleached streams are decolorized by passing those streams through a mass or bed of macroreticular aliphatic weak anion exchange resin at a pH of 6 - 8.5. Preferred resins are further characterized as possessing a high pK.sub.a.
Claims9
Process for removing lignin and lignin by-product color bodies from an unbleached kraft pulp mill stream which comprises passing said stream at a pH of 6-8.5 through a mass or bed of macroreticular aliphatic weak anion exchange resin possessing high pk.sub.a value of between about 5.0 and about 10.0 in the free base form, thereby removing the lignin and lignin by-product color bodies on to the resin.
Dependencies are inferred from the claim text.