FIELD: chemistry.
SUBSTANCE: method of processing a cellulose mass by the Kraft-process with preliminary hydrolysis (PHKP) includes the addition of wood chips or a similar material into a reaction vessel, carrying out preliminary hydrolysis and neutralisation of the mixture by the first quantity of white liquor with the further addition of another solution, such as an alkaline filtrate of cold-alkaline extraction, if necessary, enriched with white liquor. Neutralisation liquids are replaced with digestion liquor, containing hot black liquor and the alkaline filtrate, if necessary, enriched with the white liquor. The concentration of effective alkali in the digestion liquor can be relatively high.
EFFECT: effective and cost-effective production of soluble cellulose with the high content of alpha-cellulose by the prevention of re-precipitation of hemicelluloses.
43 cl, 18 dwg, 1 tbl, 10 ex
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