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Method for pulping wheat straw by using xylanase and pectinase

A technology of wheat straw and xylanase is applied in the direction of pulping with inorganic alkali, pulp beating/refining method, recycling technology, etc. The operation method is simple, the dosage is reduced, and the effect of reducing the energy consumption of pulping

Active Publication Date: 2021-08-17
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of environmental pollution and high energy consumption in chemical mechanical pulping, the present invention establishes a pulping method under normal temperature and pressure conditions according to the actual situation. The advantage of this pulping method is that it reduces the amount of chemical reagents added , thereby reducing the emission of harmful substances; at the same time, the addition of enzymes reduces the energy consumption of pulping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Place the naturally air-dried wheat straw and water in a ratio of 1:7 under a water bath for 2 hours of swelling treatment;

[0039] (2) Add 2.0% potassium hydroxide (KOH) solution for treatment, and use phosphoric acid solution to adjust the pH to neutral after standing for 1 hour;

[0040] (3) Under neutral conditions, add a mixture of xylanase and pectinase at 80°C, wherein the addition ratio of xylanase and pectinase is 1:1, and the addition amount is 10U / g absolute dry pulp, react for 30min;

[0041] (4) Use a refiner to grind the processed samples, and set the number of revolutions to 2500r.

[0042] The beating degree of the pulp measured through the above-mentioned steps is 44.33°SR.

Embodiment 2

[0044] (1) Place the naturally air-dried wheat straw and water under the water bath for 2 hours of swelling treatment according to the ratio of 1:7.56;

[0045] (2) Add 1.75% potassium hydroxide (KOH) solution for treatment, and use phosphoric acid solution to adjust the pH to neutral after standing for 1 hour;

[0046] (3) Under neutral conditions, add a mixture of xylanase and pectinase at 80°C, wherein the addition ratio of xylanase and pectinase is 1:1, and the addition amount is 10U / g absolute dry pulp, react for 30min;

[0047] (4) Use a refiner to grind the processed samples, and set the number of revolutions to 2850r.

[0048] The beating degree of the pulp measured through the above-mentioned steps is 43°SR.

Embodiment 3

[0050] Compared with Example 1, when other factors are constant, the number of revolutions is adjusted, and the relationship between it and the degree of beating is tested. The results show that: when the number of revolutions reaches 2000-3000r, it can reach 40-45 ° SR, which is The same as the normal demand of the factory.

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PUM

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Abstract

The invention belongs to the technical field of biology, and relates to a method for pulping wheat straw by using xylanase and pectinase, which comprises the following steps: swelling wheat straw; treating the wheat straws subjected to swelling treatment in an alkaline solution, and then adjusting the pH value to be 7; and under a neutral condition, carrying out enzyme treatment on the pulp treated by the alkaline solution by adopting a mixed solution of xylanase and pectinase, and grinding to obtain a product. According to the pulping mode, the agricultural waste wheat straw is used as the main raw material, important significance is achieved for cyclic utilization of biomass resources, combined treatment is conducted through xylanase and pectinase, the use amount of chemical reagents is reduced, and pulping energy consumption is reduced; meanwhile, the cooking process of the raw materials is omitted, and the target beating degree can be obtained under the conditions of normal temperature and normal pressure.

Description

technical field [0001] The invention belongs to the field of biotechnology, and relates to a pulping method for wheat straw pulping under normal temperature and pressure by using biological enzymes. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The paper industry is facing global problems such as energy shortage, high environmental pressure, and shortage of papermaking raw materials, and urgently needs reform and transformation. Since modern times, wood is the main raw material for papermaking. However, my country's wood resources are increasingly scarce. In recent years, wood resources have become more and more dependent on imports. Therefore, it is necessary to speed ...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21C1/02D21C1/04D21C1/06D21C5/00D21D1/20
CPCD21H11/12D21C5/005D21C1/02D21C1/04D21C1/06D21D1/20D21B1/021D21C5/00D21C3/02
Inventor 王瑞明卫姗刘开泉吉兴香李丕武
Owner QILU UNIV OF TECH