Mechanical alkaline pulping method using hydrogen dioxide from raw material of grass family

A hydrogen peroxide and mechanical pulping technology, which is applied in chemical/chemical mechanical pulp, non-woody plant/crop pulp, etc., can solve the problems of low application potential, difficulty in bleaching, and low pulp whiteness, and achieve good strength, Good strength performance, high whiteness effect

Inactive Publication Date: 2004-08-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the shortcoming of the wheat straw APMP pulp that above-mentioned research prepares is that pulp brightness is low (generally lower than 60% ISO), and it is difficult to bleach
Due to the difficulty of further improving the brightness, the application range of wheat straw APMP pulp is limited, and the application potential is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After the wheat straw material is cut (length 20-30mm) and dust removed, add 60℃ warm water and immerse it for 1 hour according to the ratio of water volume (ml) to the absolute dry weight of wheat straw (g) at a ratio of 10:1; Press dehydration (compression ratio 4:1), then add 2% NaOH, 0.5% H 2 O 2 , 0.3% EDTA, treated at 50 ℃ for 20 minutes, the ratio of the volume of water (ml) to the absolute dry weight of the raw material (g) during the treatment is 15:1; after the treatment is completed, the first stage of refining is carried out with a refiner. The pulp concentration is 10%, and the refining gap is 0.5mm; after washing the crude pulp with water, it is treated with hemicellulase crude enzyme solution for 30 minutes at a concentration of 5%, 40°C, and system pH 3.5. The amount of xylanase It is 5IU / g absolutely dry raw material; after the enzyme treatment slurry is washed, it is washed in 1% NaOH, 2% H 2 O 2 , 0.2% EDTA, 60°C, 2% Na 2 SiO 3 , 0.2%MgSO 4 , And then pro...

Embodiment 2

[0025] After the wheat straw material is cut (20-30mm in length) and dust removed, add 70℃ warm water and soak for 2.5 hours at the ratio of water volume (ml) to the absolute dry weight of wheat straw (g) at a ratio of 20:1; Press dehydration (compression ratio 4:1), then add 6% NaOH, 2% H 2 O 2, 0.5% EDTA, treated at 80°C for 40 minutes, the ratio of the volume of water (ml) to the absolute dry weight (g) of the raw material during the treatment is 10:1; The pulp concentration is 20%, and the refining gap is 0.3mm; after washing the crude pulp with water, use hemicellulase crude enzyme solution and lignin peroxidase crude enzyme at a concentration of 10%, 50°C, and system pH 5.0. The mixed enzyme solution is treated for 90 minutes. The dosage of xylanase is 15IU / g of absolutely dry raw material, and the dosage of lignin peroxidase is 1IU / g of absolutely dry raw material; the slurry after enzyme treatment is washed, in 2% NaOH , 6% H 2 O 2 , 0.5% EDTA, 90°C, 1% Na 2 SiO 3 , 0.5%Mg...

Embodiment 3

[0027] After the wheat straw material is cut (length 20-30mm) and dust removed, add 80℃ warm water and immerse it for 2 hours according to the ratio of water volume (ml) to the absolute dry weight of wheat straw (g) at a ratio of 30:1; Press dehydration (compression ratio 4:1), then add 8% NaOH, 1% H 2 O 2 , 0.8% EDTA, treated at 90 ℃ for 60 minutes, the ratio of the volume of water (ml) to the absolute dry weight of the raw material (g) during the treatment is 9:1; after the treatment is completed, the first stage of refining is carried out with a refiner. The pulp concentration is 20%, and the refining gap is 0.1mm; after washing the crude pulp with water, it is treated with hemicellulase crude enzyme solution for 180 minutes at a concentration of 15%, 65°C, and system pH 6.0. The amount of xylanase It is 30IU / g absolutely dry raw material; the slurry after enzyme treatment is washed in 2.5% NaOH, 4% H 2 O 2 , 0.5% EDTA, 80°C, 0.5% Na 2 SiO 3 , 0.5%MgSO 4 , The concentration is ...

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Abstract

A process for mechanically preparing the alkaline hydrogen peroxide pulp from raw straw materials includes such steps as immersing raw straw materials in hot water, squeezing for dewatering, chemical pretreating, grinding, enzyme treating with the solution of semi-cellulase or the solution of semi-cellulase and lignin peroxidase, chemical pretreating, and grinding. The resultant pulp features high whiteness and strength and easy treatment of its sewage.

Description

(1) Technical field [0001] The invention relates to a method for alkaline hydrogen peroxide mechanical pulping (APMP), in particular to a method for pulping grass raw material APMP. (2) Background technology [0002] Alkaline hydrogen peroxide mechanical pulping (APMP) is a new chemical mechanical pulping process developed in the late 1980s and early 1990s. Compared with other chemical mechanical pulping methods (such as CTMP), it has To achieve relatively small-scale production, the location of the company is limited by raw material resources, pulping and bleaching are carried out at the same time, equipment and infrastructure investment is small, raw materials are widely adapted, and pollution control is easy. Therefore, it is praised as "the most potential for development." "The pulping process. At present, there are many researches on APMP pulping in the world. The raw materials used involve coniferous wood (such as spruce), hardwood (such as poplar, eucalyptus, etc.) and non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/02D21H11/12
Inventor 赵建李雪芝曲音波
Owner SHANDONG UNIV
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