Process for separating lignosulfonic acids and...

Details Process for separating lignosulfonic acids and... Process for separating lignosulfonic acids and...

C - Chemistry, Metallurgy

07

G

260/133

C07G 1/00 (2006.01) C08H 6/00 (2010.01)

Patent

CA 1154439

Abstract of the Disclosure A process for separating lignosulfonic acids and lignosulfonates by extraction from spent sulfite liquor resulting from the cooking of cellulose-containing material. The process comprises extracting spent liquor by means of liquid amine dissolved in an organic solvent poorly soluble in water, separating the organic phase from aqueous phase, stripping the organic phase by means of a base, and returning the organic phase after regeneration to the extraction of spent liquor. The organic solvent poorly dissoluble in water is a strongly polar ketone, preferably a methyl isobutyl ketone. The amine used as reagent is treated with an aqueous solution of sodium bisulfate in order to bring the liquid amine into bisulfite form.

352894

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