Method for comprehensive utilization of wood fiber all components

A wood fiber, full-component technology, applied in fiber raw material processing, textile and paper making, etc., to achieve the effect of comprehensive utilization

Inactive Publication Date: 2019-02-12
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: In view of the existing problem that it is difficult to realize the comprehensive utilization of lignocellulosic components, the purpose of the present invention is to provide a method for comprehensive utilization of all components of lignocellulosic fibers, and obtain C5 sugars and C5 sugars derived from hemicellulose. Derivatives of sugars, phenolic components derived from lignin and high-purity cellulosic materials

Method used

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  • Method for comprehensive utilization of wood fiber all components
  • Method for comprehensive utilization of wood fiber all components
  • Method for comprehensive utilization of wood fiber all components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) CO 2 Auxiliary hydrothermal liquefaction process:

[0030] Weigh 8g of poplar sawdust and mix 80g of water into the autoclave, and feed CO 2 Gas 20bar, start stirring, raise the temperature to 140°C at a heating rate of 5°C / min, keep it warm for 10min, cool down to room temperature quickly after the reaction, filter, wash the residue with water, and dry at 105°C to obtain 6.82g of solid residue, transform The rate is 17.73%. The yield of C5 sugar and C5 sugar derivatives was 10.74%. The contents of cellulose, hemicellulose and lignin in the residue were 54.79%, 15.60% and 24.43%, respectively.

[0031] (2) Catalytic hydrogenation process:

[0032] Get the solid residue after drying in the above step (1), catalyst 3.41g, solvent is isopropanol and water (2: 1, v / v), join reaction kettle, wherein solid residue: mixed solvent=1: 10 ( w / w), and pass through 40barH 2 , the temperature was raised to 220°C, and the reaction time was 6h. After the reaction kettle is ...

Embodiment 2

[0036] (1) CO 2 Auxiliary hydrothermal liquefaction process:

[0037] Weigh 8g of poplar sawdust and mix 80g of water into the autoclave, and feed CO 2 Gas 20bar, start stirring, raise the temperature to 160°C at a heating rate of 5°C / min, keep it warm for 10min, cool down to room temperature quickly after the reaction, filter, wash the residue with water, and dry at 105°C to obtain 5.97g of solid residue, transform The rate is 25.41%. The yield of C5 sugar and C5 sugar derivatives was 12.65%. The contents of cellulose, hemicellulose and lignin in the residue were 60.36%, 8.23%, and 26.26%, respectively.

[0038] (2) Catalytic hydrogenation process:

[0039] Get the solid residue obtained in the above step (1), catalyst 2.99g, mixed solvent isopropanol and water (2:1, v / v) into the reactor, wherein solid residue: mixed solvent=1:10 (w / w ), and pass into 40bar H 2 , the temperature was raised to 220°C, and the reaction time was 6h. After the reaction kettle is cooled dow...

Embodiment 3

[0043] (1) CO 2 Auxiliary hydrothermal liquefaction process:

[0044] Weigh 8g of poplar sawdust and mix 80g of water into the autoclave, and feed CO 2 Gas 20bar, start stirring, raise the temperature to 180°C at a heating rate of 5°C / min, keep it warm for 10min, cool down to room temperature quickly after the reaction, filter, wash the residue with water, and dry at 105°C to obtain 5.12g of solid residue, transform The rate is 35.05%. The yield of C5 sugar and C5 sugar derivatives was 17.22%. The contents of cellulose, hemicellulose and lignin in the residue were 66.42%, 3.97%, and 24.20%, respectively. The liquid product was subjected to liquid phase test and analysis, and the test results are shown in Table 1. It can be seen from Table 1 that the main components of the liquid products of carbon dioxide assisted liquefaction are xylooligosaccharides, arabinose oligosaccharides, glucose oligosaccharides xylose, arabinose, acetic acid, furfural, glucose and hydroxymethylfu...

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Abstract

The invention discloses a method for comprehensive utilization of wood fiber all components. The method comprises the following steps: firstly, separating hemicellulose components by carrying out CO2-assisted hydrothermal liquefaction and mainly hydrolyzing the hemicellulose components into C5 sugar and a C5 sugar derivative; converting lignin into a phenolic product through a catalytic hydrogenation process; finally, dissolving out small amount of hemicellulose and lignin left in the wood fiber residues by carrying out alkaline hydrogen peroxide treatment, thus finally obtaining high-purity cellulose. In situ weak acid carbonic acid is formed by pressurizing carbon dioxide; a reactant is gradually acidized due to the dissociation of the carbonic acid; by use of the pressurization effect of the carbon dioxide, the permeability of a solvent to the wood fiber can be greatly improved. According to the method disclosed by the invention, various products of wood fiber components are obtained by separating and further the comprehensive utilization of the wood fiber all components is realized.

Description

technical field [0001] The invention belongs to the technical field of lignocellulosic biomass, and in particular relates to a method for comprehensive utilization of all components of lignocellulosics. Background technique [0002] The structural complexity of biomass and the marked differences in the physical and chemical properties of cellulose, hemicellulose, and lignin pose obstacles to the degradation process of biomass conversion. At present, many studies have realized the conversion of all components of lignocellulosic fibers through thermochemical conversion technology, and obtained complex mixtures containing various aldehydes, acids, esters, phenolic derivatives and cyclic oxygenates, which are very important for product separation and further refining. The process posed enormous difficulties. Studies have shown that the most potential utilization method of lignocellulosic biomass is to completely separate the components of cellulose, hemicellulose and lignin, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 徐俊明翟巧龙尹延柏蒋剑春王奎叶俊周铭昊龙锋
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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