Method for cleaning and separating main components of wood fibers

A main component, wood fiber technology, applied in fiber raw material treatment, textile and papermaking, washing/replacing pulp treatment liquid, etc., can solve the problems of subsequent utilization of unfavorable separation products, large damage of main components, harsh reagent synthesis conditions, etc. problem, achieve the effect of improving component separation efficiency, step-by-step efficient separation, and low price

Active Publication Date: 2020-12-29
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Existing separation technologies usually use a variety of chemicals to process raw materials, and a large amount of waste liquid is generated during the separation process, causing environmental pollution, and the relatively severe treatment conditions have a greater degree of damage to the main components, which is not conducive to the subsequent utilization of the separated products , which limits the application of its technology
Although the new separation technology developed at this stage has solved some of the problems existing in the existing technology, there are still many shortcomings, such as low separation purity, low yield, complicated process flow, harsh synthesis conditions of reagents used, high cost and poor stability , easy to cause environmental hazards, difficult to achieve effective recycling, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of deep eutectic solvent: weigh choline chloride, imidazole and glycerol in a three-necked flask with a molar ratio of 3:7:2, heat and stir at 60°C to obtain a homogeneous transparent liquid, which is the deep eutectic solvent (DES), cooled to room temperature and stored in a desiccator.

[0047] Weigh 1.00g red poplar wood powder (40-60 mesh) and 20ml deionized water into the autoclave, react at 180°C for 35min, and filter to obtain residue 1 and supernatant 1 after the reaction. The residue is washed and dried for later use. The supernatant was concentrated by vacuum distillation and water was recovered, and one volume of ethyl acetate was added to extract three times. The obtained aqueous phase was separated by a 200 Dalton nanofiltration membrane to separate oligosaccharides, and the filtrate was recovered and the obtained oligosaccharides were dried. Mix the dried residue one with the above-mentioned ternary DES at a mass ratio of 1:20, then raise the ...

Embodiment 2

[0050] Preparation of deep eutectic solvent: Weigh choline chloride, imidazole and 1,4-butanediol in a three-necked flask with a molar ratio of 3:7:1.5, heat and stir at 60°C to obtain a homogeneous transparent liquid. Deep eutectic solvent (DES), cooled to room temperature and stored in a desiccator.

[0051] Weigh 1.00g red poplar wood powder (40-60 mesh) and 30ml deionized water into the autoclave, react at 160°C for 45min, and centrifuge to obtain residue 1 and supernatant 1 after the reaction. The residue is washed and dried for later use. The supernatant was concentrated by vacuum distillation and water was recovered, and one volume of ethyl acetate was added to extract three times. The obtained aqueous phase was separated by a 200 Dalton nanofiltration membrane to separate oligosaccharides, and the filtrate was recovered and the obtained oligosaccharides were dried. Mix the dried residue one with the above ternary DES at a mass ratio of 1:10, then raise the temperature...

Embodiment 3

[0054] Preparation of deep eutectic solvent: Weigh choline chloride, p-hydroxybenzenesulfonic acid and glycerol in a three-necked flask at a molar ratio of 1:0.05:2, heat and stir at 60°C to obtain a homogeneous transparent liquid. Deep eutectic solvent (DES), cooled to room temperature and stored in a desiccator.

[0055] Weigh 1.00g of wheat straw (40-60 mesh) and 25ml of deionized water into the autoclave, react at 170°C for 30min, and filter to obtain residue 1 and supernatant 1 after the reaction. The residue is washed and dried for later use. Concentrate the supernatant by vacuum distillation and recover water, add one volume of ethanol to extract three times, the obtained water phase is separated by 200 Dalton nanofiltration membrane to separate oligosaccharides, the filtrate is recovered and the obtained oligosaccharides are dried. Mix the dried residue one with the above ternary DES at a mass ratio of 1:25, then raise the temperature to 130°C, and react for 3 hours u...

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PUM

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Abstract

The invention provides a method for cleaning and separating main components of wood fibers, which comprises the following step: separating oligosaccharide, lignin and cellulose components from a lignocellulose raw material by adopting a hydrothermal method and a ternary eutectic solvent, wherein the ternary eutectic solvent is composed of a hydrogen bond acceptor, a first hydrogen bond donor and asecond hydrogen bond donor according to a certain molar ratio. Through the method, oligosaccharide, lignin and cellulose with relatively high purity can be efficiently obtained from the lignocellulose raw material. In addition, the ternary eutectic solvent used in the method is low in cost and easy to recover, so that the method also has environmental and economic feasibility.

Description

technical field [0001] The invention belongs to the field of separation of biomass components, and in particular relates to a method for cleanly separating the main components of wood fibers. The wood fiber Green and efficient separation of element components. Background technique [0002] With the development of human society and the consumption of mineral resources, problems such as energy shortage and environmental pollution are becoming more and more serious, and the use of lignocellulose, a renewable resource with abundant storage, to replace fossil resources has become a research hotspot in recent years. [0003] Lignocellulosic raw materials are mainly composed of three major components: cellulose, hemicellulose and lignin. Among them, the cellulose content is 32%-54%, the hemicellulose content is 11%-37%, and the lignin content is 17-32%. The molecular structures of the three components are different and closely combined. The products obtained from the treatment of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00D21C9/02
CPCD21C5/00D21C9/02
Inventor 许凤李海潮李鑫游婷婷陈阳雷张凤山张学铭
Owner BEIJING FORESTRY UNIVERSITY
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