Method of preparing bleaching dissolved pulp from corn stem

A technology of cornstalk and dissolving pulp, which is applied in the field of pulp pulping, can solve the problems of difficult bleaching of cooking pulp, shortage of raw material sources, environmental pollution, etc., so as to alleviate the shortage of production raw materials, improve utilization value and economic value, reduce The effect of production costs

Inactive Publication Date: 2007-10-24
CHTC HELON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no perfect method of using corn stalks to produce pulp raw materials for cellulose viscose fibers. Most of the existing pulping processes using corn stalks are relatively complicated and unsuitable for manipulation. Cooking and pulping are not easy to bleach, especially in the production of Wastes such as pulping waste liquid produced after pulping have caused great pollution to the environment, which has brought certain difficulties to people to use cornstalks to alleviate the shortage of raw materials for viscose fiber production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Material preparation is to take corn stalk raw material to remove the root, crush or crush and separate the stalk and pith for material preparation;

[0017] The impregnation is to impregnate the material that has been prepared and processed at a content of 25g / L in terms of NaOH, a liquid ratio of 1:4, a temperature of 85°C and a normal pressure of 40min, and a solid concentration of 14%; after impregnation, the cornstalk raw material The weight percentage of the medium cellulose is 60%, the weight percentage of the total lignin is 13%, the weight percentage of the polypentose is 21%, and the yield is 90%.

[0018] Cooking is to put the raw material of corn stalks into the steaming ball, the concentration of alkali is 90g / L in terms of NaOH, and the amount of alkali used is 20% in terms of NaOH. After idling for 17 minutes, steam is introduced into the steaming ball, and the temperature is raised for 25 minutes at a time. The pressure in the steaming ball reaches 0.25M...

Embodiment 2

[0021] Material preparation is to take corn stalk raw material to remove the root, crush or crush and separate the stalk and pith for material preparation;

[0022] The impregnation is to impregnate the material that has been prepared and processed at a content of 28g / L in terms of NaOH, a liquid ratio of 1:4.8, a temperature of 95°C and a normal pressure of 20min, and a solid concentration of 16%; after impregnation, the cornstalk raw material The weight percentage of the medium cellulose is 65%, the weight percentage of the total lignin is 12%, the weight percentage of the polypentose is 20%, and the yield is 88%.

[0023] Cooking: Put the raw material of corn stalks into the steaming ball, the concentration of the base is 80g / L in terms of NaOH, and the amount of alkali is 30%. The pressure in the steaming ball reaches 0.3MPa, and the pressure in the steaming ball is 0MPa after a small degassing; the steam is introduced again, and the temperature is raised for 40 minutes fo...

Embodiment 3

[0026] Material preparation is to take corn stalk raw material to remove the root, crush or crush and separate the stalk and pith for material preparation;

[0027] The impregnation is to impregnate the material that has been prepared and processed in a mixture of alkali and black liquor with a content of 32g / L in terms of NaOH and a liquid ratio of 1:5.2 at a temperature of 80°C under normal pressure and keep it warm for 30min. The concentration is 16%; the weight percentage of cellulose in the cornstalk raw material after soaking is 63%, the weight percentage of total lignin is 14%, the weight percentage of pentosaccharide is 21%, and the yield is 86%.

[0028] Cooking: put the raw material of corn stalks into the steaming ball, the concentration of the alkali is 70g / L in terms of NaOH, the amount of alkali used is 35% in terms of NaOH, first run dry for 20 minutes, then pass steam into the steaming ball, and raise the temperature for 35 minutes at a time. The pressure in th...

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Abstract

The present invention discloses method which prepares bleaching dissolved pulp using corn-straw, it slurries using the alkali mode of one boiling and three heating-up after impregnating corn-straw in alkaline solution. It includes the production steps: preparing raw materials, dipping, feeding, boiling, washing materials, beating, former classification, chlorin-alkalization, bleaching, acid treatment, washing in water, rear classification, coarsing pulp and preparing the products. The method can produces the corn-straw into high grade slurry used for preparing viscose fiber, the slurry boiled is easier to be bleached, and the method has simple technology and easy operation, it greatly reduces the heavy environmental pollution caused by the waste disposals of pulping waste liquid after pulping production.

Description

technical field [0001] The invention relates to the technical field of pulping, in particular to a method for preparing bleached dissolving pulp by using corn stalks as raw materials. Background technique [0002] At present, cellulose viscose fiber is a kind of fiber widely used by people, and the pulp raw materials used to produce cellulose viscose fiber are mostly coniferous wood, broad-leaved wood or cotton linter as the main raw material, but with the increasing forest resources With the reduction and increasing of the amount of cotton used in textiles, the source of raw materials for viscose fiber production is extremely tight. In order to solve this problem, people began to look for new cellulose viscose fiber raw materials such as bagasse, reed, hemp, etc. to produce viscose fiber. [0003] Corn is currently a major crop in people's agricultural production, and the yield of corn stalks as a by-product of corn planting is very considerable. The average length of fibe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C3/02D21C3/22D21C7/00D21C1/06
Inventor 刘建华王东桑洪波黄鲁
Owner CHTC HELON
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