The invention discloses a production process of modified paper-making grade wood pulp, which comprises the following steps: (1) preparing materials, feeding paper-making grade wood pulp boards into a hydraulic pulper, dispersing and dispersing through alkali spraying and
agitator, After being sent to the press for
extrusion and
dehydration, it is sent to
steaming balls; (2) cooking, the impregnated
slurry enters
steaming balls for cooking, and caustic soda is added; (3) chlorination, the cooked
slurry is chlorinated, and added
Hydrochloric acid,
liquid chlorine, caustic soda; (4) bleaching, the chlorinated
slurry is sent to the bleaching tank for bleaching; (5)
acid treatment, adding
hydrochloric acid for
acid treatment, spraying into the bleaching tank, and
papermaking , Packaged as wood pulp. The invention uses a hydraulic pulper to fully decompose and disperse the slurry, so that the impregnation of the wood
fiber and the lye is more uniform, and the uniformity of cooking is greatly improved. Through the
cooking process, the content of non-
cellulose impurities can be reduced, and the
degree of polymerization of cotton fibers can be reduced. Through the chlorination process, part of the
colored impurities can be removed, and the content of
methyl cellulose can be increased accordingly. Through the bleaching process, the whiteness of
cellulose can be improved, and the
polymerization can be continuously reduced to remove impurities. Through
acid treatment, ash and iron can be removed, and the reaction performance can be improved. The modified
papermaking grade wood pulp produced by the invention can meet the index requirement of dissolving wood pulp and meet the production requirement of
viscose fiber.