METHOD OF REMOVING HEMICELLULOSES FROM PULP

摘要

The present invention concerns a method of producing dissolving pulp, wherein bleached paper pulp produced by kraft pulping is used as a raw-material pulp, the method being carried out by cold alkali treatment by mixing the raw-material pulp with a concentrated alkali solution such that the mixture of the pulp and the alkali solution contains 50 - 220 g/1 alkali and the solution is allowed to be absorbed into the pulp at a temperature of 20 - 50 °C. The alkali is allowed to act on the pulp in order to dissolve hemi celluloses into it and the hemicelluloses-containing alkali solution is separated from the pulp, i.e. from the dissolving cellulose pulp. Finally, the separated alkali solution is concentrated and recycled to the feed of the cold alkali stage.