Method for improving performance of wood chemimechanical pulp through biological enzyme pretreatment

A pretreatment and bio-enzyme technology, applied in the direction of using microorganism/enzyme cellulose treatment, pulping with inorganic alkali, fiber raw material treatment, etc., can solve the shortage of raw materials, environmental pressure, paper industry development, large amount of raw material processing, continuous production It can reduce the energy consumption of pulping, improve the economic benefit and improve the softness of fiber.

Inactive Publication Date: 2019-12-24
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

It has the characteristics of high energy consumption, heavy pollution load, strong production continuity, complex process flow, large amount of raw material processing, and large investment.
However, the shortage of raw materials and environmental pressure have become the bottleneck restricting the development of the paper industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Poplar APMP pulp: Poplar chips are sieved, soaked and washed at room temperature, steamed at 95°C for 15 minutes, and then extruded with a twin-screw extruder. The extruded slurry is subjected to enzyme treatment, cellulase CWX-260S from Novozymes is selected, the slurry concentration is 4%, pH = 7, and the temperature is 50°C. Add enzyme solution according to 0.4kg / t absolute dry slurry and keep stirring , after reacting for 60 minutes, boil the slurry for 5 minutes to inactivate the remaining enzymes; then carry out chemical impregnation, the impregnation solution is: the amount of hydrogen peroxide is 5%, the amount of sodium hydroxide is 6%, and the amount of sodium silicate is 2.0 %, the amount of DTPA is 0.5%, the amount of magnesium sulfate is 0.1%, and the slurry concentration is 20%, and the temperature is 85 ℃ and the temperature is kept for 40 minutes. The pulp after chemical impregnation is subjected to normal pressure refining, and the refined pulp is subje...

Embodiment 2

[0030] Eucalyptus APMP pulp: sieve the tailed eucalyptus wood chips, soak and wash at room temperature, steam at 105°C for 10 minutes, and then extrude with a twin-screw extruder. The extruded slurry is subjected to enzyme treatment, using hemicellulase CWX-262B from Novozymes, with a slurry concentration of 2.5%, pH=7, and a temperature of 50°C. The enzyme solution is added at 0.3kg / t dry pulp and continuously Stir. After reacting for 45 minutes, boil the slurry for 5 minutes to inactivate the remaining enzymes; then carry out chemical impregnation, which is divided into two stages: the amount of hydrogen peroxide in the first stage is 2%, the amount of sodium hydroxide is 2%, and the amount of sodium silicate 1.0%, the amount of DTPA is 0.2%, and the slurry concentration is 20%, and the temperature is 90°C, and the reaction is kept for 45 minutes; after washing, the second-stage impregnation is carried out: the amount of hydrogen peroxide in the second stage is 6%, the amoun...

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PUM

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Abstract

The invention discloses a method for improving the performance of wood chemimechanical pulp through biological enzyme pretreatment. Wood chips are subjected to material preparation, spiral extrusion,biological enzyme pretreatment, chemical impregnation and pulp grinding treatment to obtain the chemimechanical pulp, and the chemimechanical pulp is subjected to latency elimination, washing, screening and purification to form paper pulp for paper pulp performance testing. According to the method, biological enzyme pretreatment is carried out on the pulp before chemical impregnation, so that lignin on surfaces of fibers partially falls off, more fine fibers are exposed, more hydroxyl groups are exposed on the surfaces, and reaction between a chemical impregnation section and a liquid medicineis facilitated. The swelling degree of the fibers is increased, the binding force among the fibers is improved, and the interweaving force among the fibers is enhanced. When the method is used for treating broad-leaved wood such as poplar and eucalyptus, the bursting strength, tensile strength and tearing strength of the prepared chemimechanical pulp are remarkably improved, and meanwhile, pulping energy consumption is reduced.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking. In particular, it relates to a method for improving the properties of wood-based mechanical pulp through biological enzyme pretreatment. Background technique [0002] The modern paper industry is already an energy-intensive, technology-intensive, capital-intensive and large-scale enterprise. It has the characteristics of high energy consumption, heavy pollution load, strong production continuity, complex process flow, large amount of raw material processing, and large investment. However, the shortage of raw materials and environmental pressure have become the bottleneck restricting the development of the paper industry. High-yield pulping technology, because of its high yield and environmental friendliness, has shown a good development prospect in the current environment. [0003] With the shortage of fossil energy in the world, the price keeps rising, which is reflected in th...

Claims

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Application Information

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IPC IPC(8): D21C5/00D21C3/02D21C3/00
CPCD21C5/005D21C3/024D21C3/006
Inventor 房桂干魏录录邓拥军沈葵忠韩善明焦健李红斌盘爱享张华兰林艳施英乔丁来保田庆文梁龙冉淼吴珽朱北平
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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