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Method for realizing pulp-fiber integrated production by taking paper pulp as raw material

A technology for pulp and raw materials, applied in pulp bleaching, fiber raw materials, raw material separation and other directions, can solve the problems of high energy consumption in viscose production, low content of A-fiber, high ash and iron content, maximize profits and improve A Fiber content, the effect of reducing ash and iron content

Active Publication Date: 2020-11-27
XINJIANG FULIDA FIBER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention provides a method for realizing the integrated production of pulp and fiber by using pulp as raw material, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the existing problems of bleached pulp polymerization degree, ash content and iron content in the production of viscose fiber. High quality content, low methyl fiber content and high energy consumption in viscose production

Method used

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  • Method for realizing pulp-fiber integrated production by taking paper pulp as raw material

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: The method of using pulp as raw material to realize the integrated production of pulp and fiber is carried out according to the following steps: the first step is to mix bleached pulp and soft water in a hydropulper to obtain a mixed pulp, and the concentration of the mixed pulp is When controlled at 4.5% to 5%, put it into the crushing tank, pump it into the bleaching and depolymerization tank, and perform bleaching and depolymerization treatment to remove the ash and iron in the mixed slurry to obtain a mass concentration of 4.5% to 5%. Bleaching and purifying the pulp; in the second step, the bleaching and purifying pulp is transported to the pulp tank and mixed evenly, and then enters the production process of the wet sheet machine for dehydration and extrusion to obtain wet pulp; the third step is the grammage of the wet pulp And after the dryness is stable, according to the speed, gram weight and width of the wet sheeting machine, calculate the amount...

Embodiment 2

[0025] Embodiment 2: The method for realizing the integrated production of pulp and fiber with paper pulp as raw material is carried out according to the following steps: the first step is to mix bleached paper pulp and soft water in a hydropulper to obtain a mixed pulp, and the concentration of the mixed pulp is When controlled at 4.5% to 5%, put it into the crushing tank, pump it into the bleaching and depolymerization tank, and perform bleaching and depolymerization treatment to remove the ash and iron in the mixed slurry to obtain a mass concentration of 4.5% to 5%. Bleaching and purifying the pulp; in the second step, the bleaching and purifying pulp is transported to the pulp tank and mixed evenly, and then enters the production process of the wet sheet machine for dehydration and extrusion to obtain wet pulp; the third step is the grammage of the wet pulp And after the dryness is stable, according to the speed, gram weight and width of the wet sheeting machine, calculate...

Embodiment 3

[0026] Embodiment 3: As an optimization of the above-mentioned embodiment, in the first step, the method of bleaching and depolymerization treatment of the mixed pulp is carried out according to the following steps: in the first step, the steam of the mixed pulp is heated to 55 to 58 ° C, and the lye is added, Adjust the alkali content of the mixed slurry to 120mg / L to 150mg / L; in the second step, add sodium hypochlorite to the mixed slurry after adding alkali for bleaching, and adjust the available chlorine content in the mixed slurry to 0.3g / L to 0.8g / L, the bleaching time is 2h to 4h; the third step, adding sodium thiosulfate to the mixed slurry after adding sodium hypochlorite to the chlorine in the mixed slurry is removed completely, and the bleaching and depolymerization reaction is terminated; the fourth step is to add Add hydrochloric acid in the mixed slurry after adding sodium thiosulfate, control the content of hydrochloric acid in the mixed slurry at 0.6g / L to 0.8g...

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Abstract

The invention relates to the technical field of viscose fiber production, in particular to a method for realizing pulp-fiber integrated production by taking paper pulp as a raw material. The method comprises the following steps: mixing bleached paper pulp with soft water for bleaching and polymerization reduction treatment to obtain bleached purified pulp with a mass concentration of 4.5-5%, and dehydrating and extruding the bleached purified pulp by using a wet papermaking machine to obtain wet pulp; after the gram weight and dryness of the wet pulp are stabilized, fully mixing a desired amount of wet pulp with a desired amount of alkali liquor to obtain alkaline mixed pulp porridge; and carrying out secondary impregnation and secondary squeezing on the mixed pulp porridge in an impregnation barrel to obtain alkali cellulose capable of meeting production requirements on mucilage glue. According to the invention, a pulp-fiber integrated process is realized; the energy consumption of the whole process production is reduced; the problem of a high polymerization degree of bleached paper pulp is solved; the ash content and the iron content of the bleached paper pulp are reduced, and the alpha-cellulose content of the paper pulp is increased; the energy consumption and the labor cost of subsequent drying, paper cutting, weighing and packaging of wet pulp are reduced; and the profitsof viscose fiber production enterprises are maximized.

Description

technical field [0001] The invention relates to the technical field of viscose fiber production, and relates to a method for realizing the integrated production of pulp fiber by using pulp as raw material. Background technique [0002] Ordinary (paper) kraft bleached pulps contain a certain amount of carbohydrates (mainly pentosan), which affects the chemical conversion of cellulose into viscose and acetate products. Therefore, it has been studied that the wood chips are hydrolyzed before alkali cooking to reduce the content of polypentose and obtain a high proportion of a-cellulose. Usually the method used for prehydrolysis is direct steaming. The function of the steam is to precipitate the organic acid in the wood, and at high temperature, the hemicellulose is hydrolyzed into soluble sugars. Subsequent kraft cooking then produces a dissolving pulp suitable for viscose production. Usually, the yield of cooked pulp after prehydrolysis treatment is 5% to 7% lower than that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/00D21B1/34D21C9/12D21C9/10
CPCD21C9/005D21C9/004D21C9/002D21B1/345D21C9/12D21C9/1052D21C9/1026D21C9/1042
Inventor 郭新武盛宁冯文军王小波程建李阳谢峰刘骥
Owner XINJIANG FULIDA FIBER CO LTD
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