Method of separating lignin and making epoxide-lignin
OwnerDale B. Holsopple, Wasyl W. Kurple +2inventors
InventorsDale B. Holsopple, Wasyl W. Kurple, William M. Kurple, Kenneth R. Kurple
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Abstract
A process for the extraction or separation of lignin from waste black cooking liquor resulting from the kraft and sulfite paper pulping process. After the lignin is separated, it is reacted with a chemical system to produce unsaturated end groups on the lignin molecule which are epoxidized to produce a lignin-epoxide resin.
Claims19
The method of separating lignin from aqueous waste black liquor, comprising the steps of contacting the waste black liquor with an organic chemical solvent in which the lignin is at least partially soluble and adding acid to the mixture to lower the pH to thereby separate a layer which layer contains lignin in said organic chemical solvent separate from an aqueous layer.
The method of separating lignin from aqueous waste black liquor, comprising the steps of contacting the waste black liquor with an organic chemical material in which the lignin is not normally considered to be soluble to wet the lignin particles with the organic chemical material and adding acid to the mixture to lower the pH to thereby separate a layer which layer contains lignin in said organic chemical material separate from an aqueous layer.
Dependencies are inferred from the claim text.