FIELD: chemistry.
SUBSTANCE: method involves saturating cellulose with polysulphide liquor taken in amount of more than 75% of the alkali dose required for the pulping process. At the first pulping step, virtually all the polysulphide completely reacts with lignocellulose material. A first amount of the pulping liquor with relatively high concentration of effective alkali (EA) is removed from the pulping vessel. At the end of the first step, a second amount of pulping liquor with relatively low concentration of EA is added. Contents of the boiling vessel are heated to pulping temperature. The second amount of pulping liquor is removed after reaching maximum pulping temperature. The first amount of pulping liquor is optionally added to the boiling vessel the pulping step where concentration of EA is relatively low. Versions of this method are also disclosed.
EFFECT: maximum output of product.
15 cl, 8 dwg, 3 tbl, 6 ex
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