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Method for Pretreating Softwood Pulp and Hardwood Pulp with Neutral Cellulase

A technology of neutral cellulase and softwood pulp, applied in the field of papermaking, can solve the problems of high energy consumption, achieve the effects of improving product quality, improving paper strength, and reducing refining power

Active Publication Date: 2016-02-03
SHANDONG YOUTELL BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these physical indicators are mutually restricted by the differences in existing equipment and technological conditions in most paper mills. For example, the improvement of bulk is mainly achieved by hot air drying. The technology and process are very mature, but the energy consumption is very high. ;In order to improve the physical indicators such as tensile strength and stiffness of paper, chemicals such as dry strength agent, wet strength agent, and stiffness agent must be added, which cannot meet the requirements of today's society for energy saving, consumption reduction, and green and environmentally friendly production.

Method used

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  • Method for Pretreating Softwood Pulp and Hardwood Pulp with Neutral Cellulase
  • Method for Pretreating Softwood Pulp and Hardwood Pulp with Neutral Cellulase
  • Method for Pretreating Softwood Pulp and Hardwood Pulp with Neutral Cellulase

Examples

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Effect test

Embodiment 1

[0026] The method for neutral cellulase pretreatment softwood pulp and hardwood pulp, comprises the following steps:

[0027] (1) Add 1 / 3 volume of pulping water into the medium-consistency hydraulic pulper tank. The pH value of the pulping water is 6.5-7.0, and the water temperature is 40-45°C. When the water temperature is lower than 40°C, use a drying Cylinder exhaust steam heats pulping water;

[0028] (2) Start the medium-consistency hydraulic pulper, add thermophilic Chaetomium cellulase for papermaking beating to the medium-consistency hydraulic pulper, and the dosage is 0.2kg of thermophilic wool for papermaking pulping per ton of pulp. For shell fungus cellulase, put the coniferous pulp and broad-leaved pulp into the medium-concentration hydraulic pulper at a ratio of 12:88, and keep the thermophilic Chaetomium cellulase and pulp in the medium-concentration hydraulic pulper for papermaking pulping. The reaction time in the pulper is 30 minutes;

[0029] (3) The pret...

Embodiment 2

[0032] The method for neutral cellulase pretreatment softwood pulp and hardwood pulp, comprises the following steps:

[0033] (1) Add 1 / 3 volume of pulping water into the medium-consistency hydraulic pulper tank. The pH value of the pulping water is 6.5-7.0, and the water temperature is 40-45°C. When the water temperature is lower than 40°C, use a drying Cylinder exhaust steam heats pulping water;

[0034] (2) Start the medium-consistency hydraulic pulper, add thermophilic Chaetomium cellulase for papermaking beating to the medium-consistency hydraulic pulper, and the dosage is 0.1kg of thermophilic wool for papermaking beating per ton of pulp. For shell fungus cellulase, put the coniferous pulp and broad-leaved pulp into the medium-concentration hydraulic pulper at a ratio of 12:88, and keep the thermophilic Chaetomium cellulase and the pulp in the medium-concentration hydraulic pulper for pulping. The reaction time in the pulper is 35 minutes;

[0035] (3) The pretreated s...

Embodiment 3

[0038] The method for neutral cellulase pretreatment softwood pulp and hardwood pulp, comprises the following steps:

[0039] (1) Add 1 / 3 volume of pulping water into the tank body of the low-consistency hydraulic pulper. The pH value of the pulping water is 6.5-7.0, and the water temperature is 40-45°C. When the water temperature is lower than 40°C, use an oven Cylinder exhaust steam heats pulping water;

[0040] (2) Start the low-consistency hydraulic pulper, add thermophilic Chaetomium cellulase for papermaking beating into the low-consistency hydraulic pulper, and the dosage is 0.3kg of thermophilic wool for papermaking pulping per ton of pulp. For shell fungus cellulase, put the coniferous pulp and broad-leaved pulp into the medium-consistency hydraulic pulper at a ratio of 12:88, and keep the thermophilic Chaetomium cellulase and the pulp used for pulping in low-concentration hydraulic pulverization. The reaction time in the pulper is 35 minutes;

[0041] (3) The pretr...

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Abstract

The invention belongs to the papermaking field, and particularly relates to a needle pulp and broad leaf pulp pretreatment method with neutral cellulase. The method comprises the following steps: adding repulping water into a groove body of a hydraulic repulper, wherein the volume of the pulp brushing water is 1 / 3-1 / 2 that of the groove body, the pH value of the repulping water is 5.5-8.5, and the water temperature is 30-50 DEG C; starting the hydraulic repulper, adding the neutral cellulase for papermaking beating into the hydraulic repulper, then putting mixed pulp of needle pulp and broad leaf pulp into the hydraulic repulper, and keeping the time of reaction between the neutral cellulase for the papermaking beating and the pulp in the hydraulic repulper to be 30-40 min, wherein 0.1-0.5 kg of the neutral cellulase for the papermaking beating is added into the pulp per ton; enabling the pretreated pulp to enter a front beating pool, sending into a fiberizer by a pulp pump and entering the next procedure. By pretreating the pulp with the neutral cellulase for the papermaking beating, ratios of long-fiber materials are reduced, material consumption is reduced, the product quality is improved, and energy conservation, consumption reduction and environment-friendly production are realized.

Description

technical field [0001] The invention belongs to the field of papermaking, and in particular relates to a method for pretreating softwood pulp and hardwood pulp with neutral cellulase. Background technique [0002] The pulp and paper industry is an industry that consumes a lot of energy, and its energy cost accounts for about 20% of the total production cost. Energy conservation has become an inevitable trend in the paper industry. In the production process, the energy consumption of beating takes up a large part of the cost. It has become an important issue in pulp and papermaking to use biological enzymes to act on pulp treatment to save energy consumption in the refining process. It has been tried in research abroad, and the United States and Mexico have tried Pergalase A40 biological enzyme in factories to reduce the energy consumption of pulp beating by 14%-20%. [0003] Due to the different raw material structures, pulping and bleaching methods, and chemical applicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21D1/02
Inventor 李新良慈元钊邓冰董成虎
Owner SHANDONG YOUTELL BIOCHEM