Method for dissociating plant fiber secondary wall S2 layer

A plant fiber and secondary wall technology, applied in the direction of fiber raw materials, fiber raw material processing, cellulose raw material pulping, etc., can solve the problems of destroying the structure of plant fiber tissue, the inability to use the space structure, and the complexity of mechanical operations, etc., to achieve high efficiency Effects of chemical modification, reduction of residues of chemical toxic substances, and utilization of high added value

Pending Publication Date: 2021-06-11
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mechanical pretreatment not only increases the specific surface area, but also increases the exposure of cellulose in the S2 layer of the secondary wall. However, due to the existence of molecular structure resistance, the mech

Method used

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  • Method for dissociating plant fiber secondary wall S2 layer
  • Method for dissociating plant fiber secondary wall S2 layer
  • Method for dissociating plant fiber secondary wall S2 layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A 20cm-thick Chi fir disc was crushed with a pulverizer, and the crushed wood samples were soaked in water for 12 hours, filtered after soaking, and the filtered wood samples were placed in a double-screw extruder for thawing until they passed through a 2cm sieve. 17.5% of the dry weight of the plant sample in NaOH solution, 10% of the dry weight of the plant sample in H 2 o 2 solution, 1.5% Na by dry weight of plant samples 2 SiO 3 9H 2 O solution, the chelating agent diethyltriaminepentaacetic acid of 0.2% of plant sample dry weight is mixed evenly and joins in the extruded pond fir wood sample (wood moisture content 25%) of 1.5kg absolutely dry, and mixes Evenly, and then put it in a disc mill (speed: 3000r / min, disc grinding distance 0.5mm) for 5min, put it in a high temperature resistant bag and seal it, and keep it in an oven at 95°C for 1h. After the heat preservation is over, plant samples Dissociate in a disc mill (rotational speed: 3000r / min, disc grinding...

Embodiment 2

[0047] A 20cm-thick Chi fir disc was crushed with a pulverizer, and the crushed wood samples were soaked in water for 12 hours, filtered after soaking, and the filtered wood samples were placed in a double-screw extruder for thawing until they passed through a 2cm sieve. 17.5% of the dry weight of the plant sample in NaOH solution, 12% of the dry weight of the plant sample in H 2 o 2 Solution, 1.8% Na by dry weight of plant samples 2 SiO 3 9H 2 O solution, the chelating agent diethyltriaminepentaacetic acid of 0.3% of the plant sample dry weight is mixed uniformly and then added to 1.5kg of absolutely dry extruded pond fir wood samples (wood moisture content 25%), and mixed Evenly, and then put it in a disc mill (speed: 3000r / min, disc grinding distance 0.5mm) for 5min, put it in a high temperature resistant bag and seal it, and keep it in an oven at 95°C for 1h. After the heat preservation is over, plant samples Dissociate in a disc mill (rotational speed: 3000r / min, disc...

Embodiment 3

[0049] A 20cm-thick Chi fir disc was crushed with a pulverizer, and the crushed wood samples were soaked in water for 12 hours, filtered after soaking, and the filtered wood samples were placed in a double-screw extruder for thawing until they passed through a 2cm sieve. 17.5% of the dry weight of the plant sample in NaOH solution, 16% of the dry weight of the plant sample in H 2 o 2 solution, 2% Na by dry weight of plant samples 2 SiO 3 9H 2 O solution, the chelating agent diethyltriaminepentaacetic acid of 0.3% of the plant sample dry weight is mixed uniformly and then added to 1.5kg of absolutely dry extruded pond fir wood samples (wood moisture content 25%), and mixed Evenly, and then put it in a disc mill (speed: 3000r / min, disc grinding distance 0.5mm) for 5min, put it in a high temperature resistant bag and seal it, and keep it in an oven at 95°C for 1h. After the heat preservation is over, plant samples Dissociate in a disc mill (rotational speed: 3000r / min, disc g...

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Abstract

The invention discloses a method for dissociating a plant fiber secondary wall S2 layer. The method can realize the exposure of high cellulose content of the S2 layer and the increase of the specific surface area, and retains the original space structure, thereby being beneficial to the utilization of high additional value of plant fibers. The resistance of molecular structures and tissue structures of the plant fibers is destroyed, and the content of active hydroxyl groups on the surfaces of the plant fibers is increased under low energy consumption. A plant sample is used as a raw material, the plant sample is soaked in a H2O2 solution and a NaOH solution to degrade hemicellulose and lignin, so that a barrier of a molecular structure is destroyed; plant fiber cell walls are dissociated by using a mechanical disc mill, so the fiber S2 layer is dissociated, tand he accessibility of surface cellulose is increased; and the plant fiber secondary wall S3 layer is reserved in the mechanical treatment, so that the original space structure is maintained. The dissociation plant fiber S2 layer is utilized to solve the problems of low surface active site and large molecular barrier.

Description

technical field [0001] The invention relates to the technical field of dissociation of the S2 layer of the secondary wall of plant fibers, in particular to a technology for dissociating the S2 layer of the secondary wall of a plant sample by combining alkaline hydrogen peroxide impregnation and mechanical grinding. Background technique [0002] Fibrous biomass is a renewable and eco-friendly natural resource in the world, which has attracted extensive attention in recent years due to its high specific surface area and excellent mechanical strength, especially as a matrix for high-performance composite materials, such as: Paper-based flexible electrodes, sensors, supercapacitors and electromagnetic interference shielding materials, etc. Biomass is composed of thick-walled tissue such as plant fiber, and plant fiber mainly includes three major components: cellulose, hemicellulose and lignin, which also leads to chemical modification of plant fiber components to change their ow...

Claims

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Application Information

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IPC IPC(8): D21B1/34D21C3/00D21D1/20
CPCD21B1/345D21C3/006D21D1/20
Inventor 房桂干邹秀秀沈葵忠邓拥军韩善明梁龙焦健李红斌盘爱享张华兰施英乔丁来保梁芳敏田庆文冉淼吴珽黄晨朱北平赵梦珂陈远航严振宇詹云妮
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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