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Pulping technique for straw fibre

A grass and fiber technology, which is applied in the pulping process of grass fiber raw materials, can solve the problems of high viscosity of black liquor, difficult recycling, papermaking hazards, etc.

Active Publication Date: 2008-01-09
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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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
[0017] Therefore, there is no feasible pulping process of grass fiber in my country at present, and we should start from the basic national conditions of our country as soon as possible to develop a kind of pulping process that can not only improve the quality of straw pulp, but also reduce the amount of waste liquid treatment and waste water. The grass pulping process, which is difficult for 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

[0073] Preparation of raw material samples: pulverize the air-dried wheat straw raw material sample with a pulverizer (Willey mill), the obtained powder is screened by a sample sieve, and the part between 40 and 60 mesh is taken for analysis after balancing the moisture.

[0074] Preparation of pulp sample: After dispersing the wet pulp sample, use a copper mesh covered with a clean white cloth to form a thin pulp sheet on a paper machine, air-dry and tear it into small pieces of 5mm × 5mm, and balance the moisture for use.

Embodiment 1

[0076] In this example, the immersion treatment process used in the alkaline pulping process uses a steaming ball of 25 cubic meters as the cooking vessel. After analysis, the weight percentage of holocellulose in the absolutely 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 preliminarily treated wheat straw is 2-3 cm long, and 4.8 tons of dry wheat straw is placed in the cooking vessel and added to the heated impregnation solution. , the immersion liquid is composed of liquid caustic soda and black liquor. The concentration of adding alkali is 14% NaOH (sodium hydroxide) solution of the percentage of dry grass weight, the content of sodium hydroxide in the dipping solution is 28 g / L, the absolute dry wheat straw amount (T) and the weight of the dipping solution total liquid volume The ratio is 1:2.8. After adding the soakin...

Embodiment 2

[0080] The same as Example 1, the difference is that the ingredients of the straw fiber raw material are: the weight percentage of holocellulose is 67.6%, the weight percentage of polypentose is 26.8%, the ash content is 10.21%, and the benzene-alcohol extract is 2.32%. Total lignin 18.96%.

[0081] In the impregnated wheat straw fiber raw material, the weight percentage of holocellulose is 66%, the weight percentage of total lignin is 16.03%, and the weight percentage of polypentose is 20%, all of which are absolutely dry raw materials.

[0082] The weight percentage of holocellulose in the fiber after one cooking is 69.52%, the weight percentage of total lignin is 9.74%, and the weight percentage of polypentose is 19.75%, all of which are absolutely dry raw materials.

[0083] The components of the pulp obtained by secondary cooking are: the weight percentage of holocellulose is 75.73%, the weight percentage of total lignin is 1.46%, and the weight percentage of polypentose ...

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Abstract

The invention discloses grass series fiber pulping technology. It includes preprocessing, once and secondary steam boiling. Its advantages are that it can reduce environment pollution that the discharged black liquor can be reduced by 50% per ton; silicon content can be reduced by 50%; water can be saved by 50%; the formed slurry has light color, high brightness, low hardness, high strength, easy pulping and bleaching.

Description

[0001] This application is a Chinese patent application 200510090868.6, the original application date was August 18, 2005, the original application number: 200510090868.6, and the invention name of the original application: divisional application of grass fiber pulping process. technical field [0002] The invention relates to a pulping process for grass fiber raw materials, belonging to the technical field of papermaking industry. Background technique [0003] As we all know, whether grass fiber raw materials can become sustainable papermaking raw materials for human beings is a concern of all countries in the world. Compared with wood fiber raw materials, it has many disadvantages, such as its harvesting, transportation, storage requires a lot of labor, the raw material collection radius is small, the paper quality is poor, and the environmental problems are serious. [0004] After analysis, the reasons are as follows: the collection and transportation radius of raw materi...

Claims

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Application Information

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IPC IPC(8): D21C1/02D21C1/06D21C7/00D21C3/22D21C11/00
Inventor 陈松涛李洪法宋明信杨吉慧孙利军路敦所
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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