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Pulping technique for fibers in grass class

A grass fiber and grass technology, which is applied in the field of pulping process of grass fiber raw materials, can solve the problems of papermaking hazards, difficult recovery and high carbohydrate content

Active Publication Date: 2008-03-05
SHANDONG TRALIN PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3. Due to the high content of silicon and carbohydrates in the raw materials, the viscosity of the black liquor is high and the recovery is difficult
4. Grass fibers (now) contain a large number of miscellaneous cells, which pose a series of hazards to papermaking
[0015]Therefore, at present, there is no feasible pulping process of grass fiber in my country, and we should start from the basic national conditions of our country as soon as possible, and develop a method that can not only improve The quality of straw pulp, and the straw pulping process that can reduce the amount of waste liquid treatment and the difficulty of waste liquid treatment, is a major problem in the current papermaking technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0071] Preparation of the raw material sample: The air-dried wheat straw raw material sample was pulverized with a pulverizer (Willey mill), and the obtained powder was screened through a sample sieve, and the part between 40 and 60 mesh was taken, and the water was balanced for analysis.

[0072] Preparation of pulp samples: After dispersing the wet pulp samples, use a copper net covered with a clean white cloth to make a thin pulp sheet on a hand paper machine. After air-drying, tear it into small pieces of 5mm×5mm, and balance the moisture for later use.

Embodiment 1

[0074] In the present embodiment, for the dipping treatment process used in alkaline pulping, 25 cubic meters of steamed balls are used as the cooking vessel. After analysis, the weight percentage of cellulose in the dry wheat straw is 69.96%, and the weight percentage of polypentose is 69.96%. The content is 25.41%, the ash content is 7.35%, the benzene-alcohol extract is 2.35%, and the total lignin is 19.85%. The length of the preliminarily treated wheat straw is 2-3 cm, and 4.8 tons of dry wheat straw are placed in a cooking vessel and heated soaking liquid , The dipping solution is composed of liquid caustic soda and black liquor. The concentration of adding alkali is the NaOH (sodium hydroxide) solution of the percentage of 14% absolute dry grass weight, the content of sodium hydroxide in the steeping liquid is 28 g / liter, the weight of the dry wheat straw amount (T) and the total liquid amount of the steeping liquid The ratio is 1:2.8. After adding the impregnating liqui...

Embodiment 2

[0078] With Example 1, the difference is that the composition of the straw fiber raw material is: the weight percentage of cellulose is 67.6%, the weight percentage of pentosaccharide is 26.8%, the ash content is 10.21%, and the benzene-alcohol extract is 2.32%. Total lignin 18.96%.

[0079] In the impregnated wheat straw fiber raw material, the weight percentage of cellulose is 66%, the weight percentage of total lignin is 16.03%, and the weight percentage of pentosaccharide is 20%, all of which are absolute dry raw materials.

[0080] The weight percentage of cellulose in the fiber after one-time cooking is 69.52%, the weight percentage of total lignin is 9.74%, and the weight percentage of pentosaccharide is 19.75%, all of which are relative to absolute dry raw materials.

[0081] The composition of the pulp obtained by secondary cooking is as follows: 75.73% by weight of cellulose, 1.46% by weight of total lignin, and 22.45% by weight of polypentose, all of which are absol...

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Abstract

The present invention discloses a pulp-making process of straw fibre. Said process adopts the steps of pretreatment, first digestion and second digestion so as to obtain the invented straw pulp. Said pulp-making process can reduce black liquor discharge by 50%, the silicon content in the black liquor also can be reduced by 50%, and the water also can be saved by 50%.

Description

technical field [0001] The invention relates to a pulping process of grass fiber raw materials, which belongs to the technical field of papermaking industry. Background technique [0002] As we all know, whether grass fiber raw materials can become paper-making raw materials for the sustainable development of human beings is a problem of concern to all countries in the world. Compared with wood fiber raw materials, it has many disadvantages, such as its harvesting, transportation, and storage require a lot of labor, the collection radius of raw materials is small, the quality of paper is poor, and environmental problems are serious. [0003] After analysis, the reasons are as follows: the collection and transportation radius of raw materials is small, which limits the scale of straw pulp mills, resulting in relatively low labor productivity. At present, the scale of straw pulp mills in the world is basically below 100,000 tons per year. Most of them are 10,000-30,000 tons / y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/12D21C1/10D21C3/22
Inventor 陈松涛李洪法宋明信杨吉慧孙利军路敦所
Owner SHANDONG TRALIN PAPER
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