Modified papermaking grade wood pulp production process

Abstract

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.

Description

technical field [0001] The invention relates to modified paper-making grade wood pulp and a production process, in particular to a production process of modified paper-making grade wood pulp suitable for viscose fibers. Background technique [0002] With the development of my country's viscose fiber industry, domestic enterprises mostly use cotton pulp as the raw material for the production of viscose fiber. However, due to the constraints of the planting area and growth cycle, the raw material is increasingly in short supply, which has seriously affected the development of my country's viscose fiber industry. develop. For this reason, very few enterprises try to use bamboo pulp as the production raw material of viscose fiber, and have achieved preliminary success, as the patent No. is CN02112175.3, the invention patent called "bamboo pulp denaturation production process" discloses a The production process of bamboo pulp, but the average length of bamboo fiber is lower than ...

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Problems solved by technology

[0002] With the development of my country's viscose fiber industry, domestic enterprises mostly use cotton pulp as the raw material for viscose fiber production. However, due to the constraints of planting area and growth cycle, this raw material is increasingly in short supply, which has seriously affected the development of my country's viscose fiber industry. develop

For this reason, very few enterprises try to use bamboo pulp as the production raw material of viscose fiber, and have achieved preliminary success, as the patent No. is CN02112175.3, the invention patent called "bamboo pulp denaturation production process" discloses a The production process of bamboo pulp, but the average length of bamboo fiber is lower than that of paper-making wood fiber, and because of its high ash content and high pentose content, bamboo fiber is hard, thick-walled, narrow cell cavity, dense fiber tissue, There are problems such as air in the cells, which makes production difficult, requires a lot of raw materials, and costs high, so it has not been widely used

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