Removal of caustic in hemicellulose caustic

Details Removal of caustic in hemicellulose caustic Removal of caustic in hemicellulose caustic

D - Textiles, Paper

21

C

D21C 11/04 (2006.01) D21C 11/00 (2006.01)

Patent

CA 2236233

Pulping chemicals and hemicellulose are recovered from a starting solution essentially free of lignin but containing a mixture of hemicellulose and caustic by electrolysing this solution in the anolyte compartment of an electrolytic cell. By electrolysis, the concentration of caustic in the anolyte is decreased and the concentration of caustic in a catholyte of said cell is increased so as to allow recovery of about 60 to about 80 percent of the caustic contained in the hemicellulose caustic starting solution.

Les produits chimiques de fabrication de pulpe et d'hémicellulose sont recyclés à partir d'une solution de départ qui est essentiellement exempte de lignine mais qui contient un mélange d'hémicellulose et d'agent caustique par électrolyse de cette solution dans le compartiment anolyte d'une cuve électrolytique. Par électrolyse, la concentration de l'agent caustique dans l'anolyte est abaissée et la concentration de l'agent caustique dans le catholyte de ladite cuve électrolytique est accrue, pour permettre la récupération de 60 à 80 % environ de l'agent caustique contenu dans la solution caustique d'hémicellulose de départ.

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