Process for treating spent, waste, alkaline digestion liquor...

D - Textiles – Paper – 21 – C

Patent

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D21C 11/00 (2006.01) B01D 19/04 (2006.01) B01D 21/01 (2006.01) B03D 3/00 (2006.01) C02F 1/52 (2006.01) C02F 1/56 (2006.01) D21C 11/02 (2006.01) D21C 11/04 (2006.01) D21C 11/06 (2006.01)

Patent

CA 2291722

A water soluble, surface active, polymeric agent is mixed with digestion liquor, preferably with an additional surface active defoamer coagulant agent prior to or during acidification of the alkaline digestive liquor. This results in an easily separable, non-gelatinous, non-gummy, coagulated lignin as a solids, particulate fraction that tends to float on a clarified liquid fraction containing recoverable salts. The solids fraction and the liquid frictions are easily separated, one from the other, by a gravity separation step.

Cette invention concerne un procédé qui consiste à mélanger à une liqueur de digestion un agent polymère, tensioactif et soluble dans l'eau avec, de préférence, un agent coagulant, antimoussant et tensioactif complémentaire, ceci avant ou pendant l'acidification de la liqueur digestive alcaline. Ce procédé permet d'obtenir une lignine coagulée facilement séparable, non gélatineuse et non gommeuse sous forme d'une fraction particulaire solide qui a tendance à flotter sur la fraction liquide clarifiée contenant des sels récupérables. La fraction solide et la fraction liquide peuvent être facilement séparées l'une de l'autre au cours d'une étape de séparation par gravité.

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