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Method for regulating viscosity of cellulose pulp

A technology of cellulose pulp and cellulose, which is applied in the fields of fiber raw material processing, textiles and papermaking, etc., and can solve the problems of pulp quality loss, effect easily affected by environment and space, etc.

Pending Publication Date: 2019-06-25
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a protein, the cellulase molecule is easily affected by the environment and space, such as temperature, enzyme activity inhibitors, and the state of the hydrolyzed substrate. In addition, cellulase treatment will cause pulp quality. Loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] Take 20g of bleached kraft pulp of coniferous wood in a ziplock bag, add water to adjust the slurry concentration to 10wt.%, then add 5g of sodium hydroxide solid and knead fully to make the sodium hydroxide and slurry fully mixed, then place in a water bath at 45°C Alkaline under conditions for 30min. Wash the alkalized slurry to neutral with deionization, then transfer the alkalized slurry to a 1000ml three-necked flask, add a certain amount of water to make the slurry concentration about 5wt.%, and then add 0.2g high Sodium iodate and 0.01g calcium chloride solid are placed in a three-necked flask, and the pH value of the slurry in the three-necked flask is adjusted to 3 with 2mol / L acetic acid solution, and then the three-necked flask is placed in a 50°C water bath, and the stirring speed is controlled to 200r / min, the slurry was taken out after the reaction was carried out for 3h under the condition of avoiding light. First wash the slurry oxidized by sodium peri...

example 2

[0016] Take 20g of bleached kraft pulp of coniferous wood in a ziplock bag, add water to adjust the slurry concentration to 10wt.%, then add 5g of sodium hydroxide solid and knead fully to make the sodium hydroxide and slurry fully mixed, then place in a water bath at 45°C Alkaline under conditions for 30min. Wash the alkalized slurry to neutrality with deionization, then transfer the alkalized slurry to a 1000ml three-neck flask, add a certain amount of water to make the slurry concentration about 7wt.%, and then add 1g of high iodine sodium chloride and 0.05g calcium chloride solid in a three-necked flask, adjust the pH value of the slurry in the three-necked flask with 2mol / L acetic acid solution, and then place the three-necked flask in a 60°C water bath, and control the stirring speed at 150r / min, the slurry was taken out after the reaction was carried out for 3 h under the condition of avoiding light. First wash the slurry oxidized by sodium periodate to neutrality wit...

example 3

[0018] Take 20g of hardwood bleached kraft pulp in a ziplock bag, add water to adjust the slurry concentration to 10wt.%, then add 5g of sodium hydroxide solid and knead fully to make the sodium hydroxide and slurry fully mixed, then place in a water bath at 45°C Alkaline under conditions for 30min. Wash the alkalized slurry to neutral with deionization, then transfer the alkalized slurry to a 1000ml three-necked flask, add a certain amount of water to make the slurry concentration about 10wt.%, and then add 0.5g high Sodium iodate in a three-necked flask, adjust the pH value of the slurry in the three-necked flask with 2mol / L acetic acid solution to 3, then place the three-necked flask in a water bath at 45°C, and control the stirring speed at 100r / min, so that the reaction is avoided The slurry was taken out after 12h under the condition of light. First wash the slurry oxidized by sodium periodate to neutrality with deionized water. Then, put the cleaned slurry into a thre...

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PUM

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Abstract

The invention provides a method for regulating the viscosity of cellulose pulp, and belongs to the field of comprehensive utilization of lignocellulose resources. According to the method, cellulose pulp is selectively oxidized with periodate to specifically introduce the aldehyde group at the sites C2 and C3 of the cellulose molecule, and the oxidized cellulose pulp is placed in an alkaline environment to regulate the viscosity of the cellulose pulp based on the principle of a beta-alkoxy eliminating reaction. According to the present invention, the oxidation degree of the cellulose pulp is controlled by changing the oxidation conditions, such that the viscosity of cellulose pulp can be efficiently regulated while the mass loss of the cellulose pulp after the regulation is effectively reduced.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of lignocellulose resources, and in particular relates to a method for regulating and controlling the viscosity of cellulose pulp. Background technique [0002] Dissolving pulp is a kind of high-purity cellulose pulp mainly made of wood. It is widely used in textile, medicine, daily chemical, food and other fields. It is the main raw material for the production of viscose fiber, acetate fiber and carboxymethyl cellulose. raw material. In recent years, with the rapid development of downstream industries of dissolving pulp such as viscose, the production and consumption of dissolving pulp in the world have also continued to increase, among which the production and consumption of dissolving pulp in my country have the fastest growth rate. At present, the output of dissolving pulp in my country has reached nearly 1.1 million tons, surpassing South Africa and Canada to become the second larges...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 石瑜田超刘艳钊
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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