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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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 processi

Method used

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Examples

Experimental program
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Example Embodiment

[0026] Example 1

[0027] Poplar APMP pulp: After the poplar chips were screened, they were soaked in water at room temperature, steamed at 95°C for 15 minutes, and then extruded with a twin-screw extruder. The slurry obtained by extrusion was subjected to enzyme treatment, and the cellulase CWX-260S from Novozymes was selected. The slurry concentration was 4%, pH=7, and the temperature was 50°C. The enzyme solution was added according to 0.4kg / t dry slurry and kept stirring. , after the reaction for 60min, the slurry was boiled for 5min to inactivate the remaining enzymes; then chemical impregnation was carried out, and the impregnation liquid was: the dosage of hydrogen peroxide was 5%, the dosage of sodium hydroxide was 6%, and the dosage of sodium silicate was 2.0 %, the dosage of DTPA is 0.5%, the dosage of magnesium sulfate is 0.1%, the slurry concentration is 20%, and the temperature is kept at 85°C for 40 minutes. The pulp after chemical impregnation is subjected to a...

Example Embodiment

[0029] Example 2

[0030] Eucalyptus wood APMP pulp: After screening residues of Eucalyptus grandis wood chips, soaked in water at room temperature, steamed at 105°C for 10min, and then extruded with a twin-screw extruder. The slurry obtained by extrusion was subjected to enzyme treatment, using Novozymes' hemicellulase CWX-262B, the slurry concentration was 2.5%, pH=7, and the temperature was 50°C. The enzyme solution was added according to 0.3kg / t dry slurry and continuously Stir. After the reaction for 45 minutes, the slurry was boiled for 5 minutes to inactivate the remaining enzymes; then chemical impregnation was carried out, and the chemical impregnation was divided into two stages: the amount of hydrogen peroxide in the first stage was 2%, the amount of sodium hydroxide was 2%, and the amount of sodium silicate was used. 1.0%, the dosage of DTPA is 0.2%, the slurry concentration is 20%, and the temperature is 90 ℃ for 45min reaction; after washing, the second-stage di...

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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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