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Method for pretreating wood fibers in bio-based polar aprotic solvent system

A polar aprotic, wood fiber technology, used in fiber raw material processing, fiber raw materials, textiles and papermaking, etc., can solve the problems of complex reactions, complex and diverse products, difficult to separate, and non-renewable solvents.

Inactive Publication Date: 2021-05-14
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

[0018] The purpose of the present invention: in order to solve the problems in the current technology that it is difficult to realize the complete separation and utilization of lignocellulosic biomass cellulose, hemicellulose and lignin components, complex reactions in the production process, complex and diverse products that are difficult to separate, solvents non-renewable bottleneck problem

Method used

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  • Method for pretreating wood fibers in bio-based polar aprotic solvent system
  • Method for pretreating wood fibers in bio-based polar aprotic solvent system
  • Method for pretreating wood fibers in bio-based polar aprotic solvent system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The first step: 10g moso bamboo harvesting and processing residues (4.5g of cellulose content, 2.62g of hemicellulose content, 2.28g of lignin content, 0.54g of moisture, 0.06g of ash content) are sieved (120 orders) by ball mill pulverization, The gamma-valerolactone / water composite solvent of gained moso bamboo powder and 100g (raw material and mixed solvent mass ratio 1:10, solvent and water mass ratio are 4:1), 2.0g p-toluenesulfonic acid (raw material and acid mass ratio The ratio is 1:0.2) and then added to the pressurized reactor after mixing.

[0054] Step 2: Raise the temperature of the reactor to 120°C, the reaction time is 60 minutes, then cool down to room temperature, stand and filter, and dry at 105°C to obtain a solid residue and weigh it, which will be used for hydrolysis and hydrogenation to prepare γ - valerolactone bio-based polar aprotic solvent;

[0055] Step 3: Take the filtrate obtained in the previous step, add a certain amount of deionized wate...

Embodiment 2

[0057] The first step: 10g moso bamboo harvesting and processing residues (4.5g of cellulose content, 2.62g of hemicellulose content, 2.28g of lignin content, 0.54g of moisture, 0.06g of ash content) are sieved (120 orders) by ball mill pulverization, The gamma-valerolactone / water composite solvent of gained moso bamboo powder and 100g (raw material and mixed solvent mass ratio 1:10, solvent and water mass ratio are 4:1), 2.0g p-toluenesulfonic acid (raw material and acid mass ratio The ratio is 1:0.2) and then added to the pressurized reactor after mixing.

[0058] Step 2: Stir and raise the temperature of the reactor to 130°C, the reaction time is 60 minutes, then cool down to room temperature, stand and filter, and dry at 105°C to obtain a solid residue and weigh it, to be used for hydrolysis and hydrogenation Preparation of γ-valerolactone bio-based polar aprotic solvent;

[0059] Step 3: Take the filtrate obtained in the previous step, add a certain amount of deionized w...

Embodiment 3

[0061] The first step: 10g moso bamboo harvesting and processing residues (4.5g of cellulose content, 2.62g of hemicellulose content, 2.28g of lignin content, 0.54g of moisture, 0.06g of ash content) are sieved (120 orders) by ball mill pulverization, The gamma-valerolactone / water composite solvent of gained moso bamboo powder and 100g (raw material and mixed solvent mass ratio 1:10, solvent and water mass ratio are 4:1), 2.0g p-toluenesulfonic acid (raw material and acid mass ratio The ratio is 1:0.2) and then added to the pressurized reactor after mixing.

[0062] Step 2: Stir and raise the temperature of the reactor to 140°C, the reaction time is 60min, then cool down to room temperature, stand and filter, and dry at 105°C to obtain a solid residue and weigh it, ready to be used for hydrolysis and hydrogenation Preparation of γ-valerolactone bio-based polar aprotic solvent;

[0063] Step 3: Take the filtrate obtained in the previous step, add a certain amount of deionized ...

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Abstract

The invention provides a method for pretreating wood fibers in a bio-based polar aprotic solvent system, wherein the method comprises the steps: catalyzing and efficiently separating cellulose, hemicellulose and lignin in a bio-based polar aprotic solvent / water composite solvent by taking agricultural and forestry residues as raw materials; adding the agriculture and forestry residues, the bio-based polar aprotic solvent / water composite solvent and low-boiling-point organic acid into a pressurized reaction kettle, carrying out heating pretreatment, cooling to room temperature after pretreatment is finished, standing, filtering to obtain solid residues and filtrate, drying the solid residues, and weighing for preparing bio-based polar aprotic solvents such as gamma-valerolactone / dihydrolevoglucosenone and the like through hydrolysis and hydrogenation; and adding a certain amount of deionized water into the filtrate, filtering to obtain brown powdery lignin dissociation polyphenol, and performing reduced-pressure fractional distillation on the filtrate to recycle water, low-boiling-point organic acid and the bio-based polar aprotic solvent. The recycled water, the recycled low-boiling-point organic acid and the recycled bio-based polar aprotic solvent can be recycled.

Description

technical field [0001] The invention belongs to the pretreatment technology of lignocellulosic biomass raw materials, and mainly relates to the directional depolymerization of three major components of cellulose, hemicellulose and lignin in lignocellulosic biomass and the efficient separation method of the depolymerized components. Background technique [0002] The shortage of global fossil energy resources and the environmental problems caused by their use have made people pay more and more attention to green and renewable energy resources that can replace fossil energy. Lignocellulosic biomass is a renewable carbon resource that can be converted into liquid fuels and chemicals. Among them, agricultural and forestry wastes such as corn cobs, bagasse, hay, straw, rice husks, and sawdust have large quantities and are easily obtained. , cheap and other characteristics, through the bio-refining process, it can be used to prepare liquid fuels such as bio-ethanol and butanol on a...

Claims

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Application Information

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IPC IPC(8): D21B1/06D21C5/00C08H7/00C08H8/00
CPCD21B1/063D21C5/00C08H8/00C08H6/00
Inventor 王奎尹小燕蒋剑春徐俊明刘超魏琳珊潘雪媛
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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