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Method for improving efficiency of treating pulp fibers by cellulase

A technology of cellulase and cellulose, applied in the field of papermaking, can solve the problems of low efficiency of biological enzyme action and decreased paper sheet strength, and achieve the effect of high pulp processing efficiency and improved dispersibility.

Pending Publication Date: 2022-05-13
保定顺通卫生纸制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, biological enzymes are used in the beating process in the production of tissue paper to reduce the energy consumption of beating and improve fiber performance, but there is a problem of low efficiency of biological enzymes
In order to improve the efficiency of biological enzymes, it is often necessary to increase the amount of biological enzymes, but when the amount of biological enzymes is increased, the degree of decomposition of cellulose by the enzymes is also correspondingly increased, resulting in a decrease in the strength of the paper

Method used

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  • Method for improving efficiency of treating pulp fibers by cellulase
  • Method for improving efficiency of treating pulp fibers by cellulase
  • Method for improving efficiency of treating pulp fibers by cellulase

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preparation example Construction

[0017] The invention provides a kind of preparation method of immobilized cellulase, comprises the following steps:

[0018] The cellulose nanofiber liquid and the cellulase enzyme liquid are mixed to obtain immobilized cellulase.

[0019] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0020] In the present invention, the length of the cellulose nanofibers in the cellulose nanofiber liquid is preferably 1-100 nm, more preferably 10-90 nm, even more preferably 20-80 nm. The cellulose nanofibers are preferably cellulose nanofibers prepared from bleached kraft pulp of softwood or bleached kraft pulp of hardwood.

[0021] In the present invention, the mass concentration of the cellulose nanofiber liquid is preferably 0.1-1.0%, more preferably 0.2-0.8%, and even more preferably 0.4-0.6%. The cellulose nanofiber liquid is preferably prepared by the following method: treating softwood kraft p...

Embodiment 1

[0033] Step 1: Add 5.0 g of cellulase enzyme liquid with a mass concentration of 0.1% to 2.0 g of cellulose nanofiber liquid with a mass concentration of 0.1% and a fiber length of 10 nm, and stir;

[0034] Step 2: Insulate in a water bath at a temperature of 30°C for 30 minutes;

[0035] Step 3: cooling the cellulase enzyme solution in step 2 to room temperature to form stable immobilized cellulase;

[0036] Step 4: Add the immobilized cellulase in step 3 to the softwood bleached kraft pulp slurry with a concentration of 0.1 wt.% in an amount of 0.005 wt.%, and treat it at room temperature for 5 minutes;

[0037] Step 5: Determination of the beating degree and softness performance of the pulp fiber, compared with the unimmobilized cellulase treatment, the beating degree of the pulp increased by 1 ° SR, and the fiber softness increased by 5 × 10 14 / (N·m 2 ), the weight of the processed slurry is 20g / m 2 paper, the softness of the paper has increased by 2 units, and the str...

Embodiment 2

[0041] Step 1: Add 5.0 g of cellulase enzyme liquid with a mass concentration of 0.5% to 2.0 g of cellulose nanofiber liquid with a mass concentration of 0.1% and a fiber length of 100 nm, and stir;

[0042] Step 2: keep warm in a water bath at a temperature of 30°C for 60 minutes;

[0043] Step 3: cooling the cellulase enzyme solution in step 2 to room temperature to form stable immobilized cellulase;

[0044] Step 4: Add the immobilized cellulase in step 3 to the hardwood bleached kraft pulp slurry with a concentration of 1.0 wt.% in an amount of 0.05 wt.%, and treat for 30 minutes at room temperature;

[0045] Step 5: Determining the beating degree and softness performance of the pulp fiber, compared with the unimmobilized cellulase treatment, the beating degree of the pulp increased by 3°SR, and the fiber softness increased by 10×10 14 / (N·m 2 ), the weight of the processed slurry is 30g / m 2 paper, the paper softness increased by 7 units, and the paper strength increase...

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Abstract

The invention provides immobilized cellulase as well as a preparation method and application thereof, and belongs to the technical field of papermaking. According to the method, cellulose nanofiber liquid and cellulase liquid are mixed to obtain the immobilized cellulase. The immobilized cellulase provided by the invention can maintain the strength of paper sheets while improving the slurry treatment efficiency of the biological enzyme.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to an immobilized cellulase and its preparation method and application. Background technique [0002] In the context of global carbon peaking and carbon neutrality, how to reduce carbon emissions in the paper industry has attracted increasing attention. As a green chemical technology, bio-enzyme technology can reduce the energy consumption of papermaking industry and improve the environmental friendliness of papermaking process. At present, biological enzymes are used in the beating process in the production of tissue paper to reduce the energy consumption of beating and improve fiber performance, but there is a problem of low efficiency of biological enzymes. In order to improve the efficiency of biological enzymes, it is often necessary to increase the amount of biological enzymes, but when the amount of biological enzymes is increased, the degree of decomposition of cellulos...

Claims

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Application Information

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IPC IPC(8): C12N11/12C12N9/42D21C5/00
CPCC12N11/12C12N9/2437D21C5/005
Inventor 赵宁赵洪奎
Owner 保定顺通卫生纸制造有限公司
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