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Process for enzyme treating before pulping by plant fibre raw material

A plant fiber and enzyme treatment technology, applied in the field of pulp and paper, can solve the problems of reducing the pertinence and effectiveness of biological enzyme treatment, long microbial pretreatment cycle, and reducing pulp yield

Inactive Publication Date: 2008-01-30
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the microbial pretreatment cycle is long, the storage space is large, and the production efficiency is low, resulting in high production costs
On the other hand, since most of the fungi used in pulping have cellulase activity at the same time, it can degrade cellulose, thereby reducing the pulp yield to a certain extent
Invention patent application "method for enzymatic pulping of grass raw materials" (Chinese Publication No. CN1421570) although adopts biological enzymes to treat grass raw materials, but uses hemicellulase crude enzyme liquid or hemicellulase crude enzyme liquid and lignin Mixed enzyme solution of peroxidase crude enzyme solution, because the crude enzyme solution contains various types of biological enzymes, it reduces the pertinence and effectiveness of biological enzyme treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Enzyme treatment of wheat straw raw material before pulping.

[0018] (1) Enzyme mixing: wheat straw is cut into 3-4 cm grass slices, and laccase and mediator are added. The addition amount of laccase is 20 LAMU per gram of absolute dry wheat straw, and the mediator is violin acid, and the addition amount is 0.01 g per gram of absolute dry wheat straw. Water is added to maintain the total liquid ratio at 4.5, so that the raw materials and biological enzymes are evenly mixed. Adjust the pH value of the system to 4-7, room temperature, and grind the raw materials immediately after mixing.

[0019] (2) In the mechanical grinding section, the wheat straw mixed with biological enzymes is mechanically ground in a refiner, the gap between the grinding discs is controlled at 0.4 mm, and no water is added during the grinding process.

[0020] (3) In the bio-enzyme action section, the milled raw materials are diluted with water to a liquid ratio of 1:5.5, fully mixed...

Embodiment 2

[0024] Example 2: Enzyme treatment of poplar raw material before pulping.

[0025] (1) Enzyme mixing: add laccase and mediator to poplar wood chips. The amount of laccase added is 30 LAMU per gram of absolute dry raw material, and the mediator is violin acid, and the added amount is 0.01 g per gram of absolute dry raw material. Water is added to maintain the total liquid ratio at 4.5, so that the raw materials and biological enzymes are evenly mixed. Adjust the pH value of the system to 5, room temperature, and grind the raw materials immediately after mixing.

[0026] (2) Mechanical grinding stage: the wheat straw mixed with biological enzymes is mechanically ground in a refiner, the gap between the grinding discs is controlled at 0.4 mm, and no water is added during the grinding process.

[0027] (3) Bio-enzyme action stage: the milled raw materials are diluted with water to a liquid ratio of 1:5.5, mixed thoroughly, then fed with oxygen, the temperature is controlled at 5...

Embodiment 3

[0032] As described in Example 1, the difference is that laccase, mediator and xylanase are added to the wheat straw flakes in step (1). Add 10 LAMU laccase, 0.003 g of 1-hydroxybenzotriazole (mediator), and 20 IU xylanase per gram of absolute dry material.

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PUM

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Abstract

The invention relates to an enzyme processing method before plant fiber raw material pulping. It belongs to paper making field. The includes the following steps: mixing plant fiber raw material and biological enzyme; the biological enzyme contains 0.5-50LAMU laccase, 0.1-5% mediator, and / or 0.5 -50IU xylanase per gram raw material; adding water to make raw material liquid ratio be 1: 4.5-5.5; mechanical grinding the processed enzyme; adding water to make liquid ration be 1:5.5-9.5; and injecting oxygen for 0.5-8h. The processed material can be used to do traditional chemical or mechanical pulp. This can greatly improve paper pulp strength and whiteness.

Description

(1) Technical field [0001] The invention relates to a method for treating plant fiber raw materials before pulping by using biological enzymes, and belongs to the field of pulping and papermaking. (2) Background technology [0002] The increasingly serious resource, energy and environmental crises are plaguing the world today. How to sustainably develop the pulp and paper industry on the premise of reducing energy consumption and controlling environmental pollution is a realistic problem faced by pulp and paper scientists. Utilizing biotechnology to transform traditional industries is one of the important ways to realize clean production and sustainable development of pulp and paper industry. In the past ten years, people have done a lot of research on the application of biotechnology in the pulp and paper industry, and the research scope has almost involved all aspects of the pulp and paper industry. For example, biopulping, biobleaching, biodeinking, resin barrier control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C1/00C12S3/00
Inventor 秦梦华徐清华傅英娟李宗全
Owner QILU UNIV OF TECH
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