A method for the production of coniferous wood - pulp for the chemical processing and, for special papers

摘要

A pulp obtained by a sulphite digestion process and which has been subjected to little or no prechlorination and/or an acid pretreatment, is subjected to a refining treatment with alkali at elevated temperature, subsequently delignified with peroxide in an alkaline, after-bleaching in or or more stages, to yield a medium-viscosity, to high-viscosity softwood sulphite pulp. The pulp is useful as starting material in the production of special papers, e.g. photographic papers, or as a starting material for the production of cellulose esters, cellulose ethers, plastic compositions and hygiene products. The process gives an effluent that is less harmful to the environment.