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Wood chip ultrasonic assisted chemical impregnated pulping bleaching method

A chemical impregnation and ultrasonic technology, applied in pulp bleaching, textile and papermaking, raw material pretreatment, etc., can solve the problems of large amount of chemicals, poor chemical impregnation effect of wood chips, etc., to achieve enhanced fiber separation and fine fiberization, The effect of promoting chemical impregnation efficiency and reducing production cost pressure

Inactive Publication Date: 2019-02-19
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a pulping and bleaching method of ultrasonically assisted chemical impregnation of wood chips to solve the problems of poor chemical impregnation effect of wood chips and large amount of chemicals used in the existing pulping and bleaching methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Commercial eucalyptus wood chips are pulped according to the following steps after screening and washing:

[0030] (1) Ultrasonic pretreatment: the processing conditions are: the ultrasonic treatment temperature is 25°C, the ultrasonic treatment time is 50min, the ultrasonic power is 550W, and the ultrasonic concentration is 2.5%;

[0031] (2) performing screw extrusion after ultrasonic treatment, the screw extrusion is normal pressure mechanical extrusion, the temperature of the screw extrusion is 45-60°C, and the compression ratio is 4:1;

[0032] (3) The material obtained by step (2) screw extrusion is carried out chemical impregnation treatment, the chemical impregnation condition is: thick 20% of slurry, the treatment time is 60min, the treatment temperature is 90 ℃, each solute consumption in the impregnation liquid is the same as that of the wood chip The ratio of absolute dry mass is: the amount of hydrogen peroxide is 8%, the amount of sodium hydroxide is 4%, t...

Embodiment 2

[0037] Commercial eucalyptus wood chips are pulped according to the following steps after screening and washing:

[0038] (1) Ultrasonic pretreatment: The treatment conditions are: the ultrasonic treatment temperature is 50°C, and the ultrasonic treatment time is

[0039] 50min, ultrasonic power is 650W, ultrasonic concentration is 5%;

[0040] (2) Carry out screw extrusion after ultrasonic treatment, described screw extrusion is normal pressure mechanical extrusion, screw extrusion

[0041] The compression temperature is 45-60°C, and the compression ratio is 4:1;

[0042] (3) carry out chemical impregnation treatment with the material that step (2) spiral extrusion obtains, and chemical impregnation condition is:

[0043] The slurry concentration is 20%, the treatment time is 60min, the treatment temperature is 90°C, the amount of each solute in the dipping liquid

[0044] The ratio with the absolute dry mass of wood chips is: hydrogen peroxide consumption is 8%, sodium hy...

Embodiment 3

[0053] Commercial eucalyptus wood chips are pulped according to the following steps after screening and washing:

[0054] (1) Ultrasonic pretreatment: The treatment conditions are: the ultrasonic treatment temperature is 80°C, and the ultrasonic treatment time is

[0055] 30min, ultrasonic power is 400W, ultrasonic concentration is 2.5%;

[0056] (2) Carry out screw extrusion after ultrasonic treatment, described screw extrusion is normal pressure mechanical extrusion, screw extrusion

[0057] The compression temperature is 45-60°C, and the compression ratio is 4:1;

[0058] (3) carry out chemical impregnation treatment with the material that step (2) spiral extrusion obtains, and chemical impregnation condition is:

[0059] The slurry concentration is 20%, the treatment time is 60min, the treatment temperature is 90°C, the amount of each solute in the dipping liquid

[0060] The ratio with the absolute dry mass of wood chips is: hydrogen peroxide consumption is 8%, sodium ...

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Abstract

The invention discloses a wood chip ultrasonic assisted chemical impregnated pulping bleaching method. Wood tips are sequentially subjected to preparation, ultrasonic pretreatment, spiral extrusion, chemical impregnation and defibrination treatment. By means of the ultrasonic cavatition, a channel where liquid flows inside wood is broken through, the fluid permeability of the wood to be impregnated is enhanced, the effective channel area inside the wood is enlarged, and the impregnation efficiency is improved. The wood chips obtained after ultrasonic treatment are subjected to dual-screw extrusion, chemical impregnation is performed on extruded raw materials, then, defibrination treatment is performed, and finally latency, washing, screening and purifying are performed to obtain paper pulp. By adopting the ultrasonic assisted chemical impregnation method, the impregnation homogeneity of chemical drugs is improved, the defibrination energy consumption is lowered, the paper pulp fiber quality is improved, and finally paper pulp with the high whiteness and good strength can be obtained.

Description

technical field [0001] The invention relates to a chemical-mechanical pulping method, in particular to a pulping and bleaching method with ultrasonic-assisted chemical impregnation. Background technique [0002] At present, my country is the largest country in the production and consumption of paper and paperboard in the world. However, due to the low forest coverage rate in my country's forest country and the relative lack of wood fiber resources, the supply of fiber raw materials, especially high-quality fiber raw materials, is very short. Moreover, most of the pulp raw materials currently used are commercial wood chips. Due to the uneven storage period and complex types, it leads to uneven penetration of liquid medicine, large amount of chemicals, high energy consumption for refining, unstable pulp quality, pulp type and quality, etc. are in the middle and lower levels. Therefore, developing and researching new pretreatment methods, improving pulp fiber quality, enhanci...

Claims

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Application Information

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IPC IPC(8): D21B1/02D21B1/14D21B1/30D21C9/16D21C9/10
CPCD21B1/023D21B1/14D21B1/303D21C9/1063D21C9/163
Inventor 房桂干解存欣邓拥军沈葵忠焦健韩善明李红斌盘爱享张华兰林艳施英乔丁来保田庆文梁龙
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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