A METHOD AND A DEVICE FOR PREPARING CELLULOSE PULP

摘要

A method and a device for preparing cellulose pulp, in which a lignin-containing raw material chopped into pieces, is impregnated with an alkaline, polysulfide-containing impregnation liquor and the thus impregnated lignin-containing raw material is cooked. In the impregnation, chips are impregnated with a circulating alkaline impregnating liquor, which impregnating liquor is concentrated by evaporating water therefrom and the polysulfide content of said concentrated impregnation liquor is increased before it is conveyed to the impregnation.