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Method for separating holocellulose in wood fibers by using choline deep-eutectic solvent

A technology of deep eutectic solvent and synthetic cellulose, which is applied in the field of biomass refining, can solve problems such as instrument corrosion, accelerated equipment aging, unfavorable interaction between deep eutectic solvent and fiber, etc., to achieve less environmental pollution and reduce equipment loss , Improve the effect of using value

Active Publication Date: 2020-02-18
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the presence of chloride ions, the negative charge distribution is too concentrated, which is not conducive to the interaction between the deep eutectic solvent and the fiber. At the same time, it will cause corrosion of the instrument during use and accelerate the aging of the equipment.

Method used

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  • Method for separating holocellulose in wood fibers by using choline deep-eutectic solvent
  • Method for separating holocellulose in wood fibers by using choline deep-eutectic solvent

Examples

Experimental program
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Effect test

Embodiment 1

[0090] The raw material of poplar wood was treated with lactic acid choline-lactic acid deep eutectic solvent to extract the cellulose.

[0091] (1) Raw material pretreatment: Take relatively uniform wood chips, air-dry, crush, and then sieve to get 40-60 mesh wood powder.

[0092] (2) Benzyl alcohol extraction: use a benzene-ethanol mixed solution with a volume ratio of 2:1 to carry out benzene alcohol extraction on the wood powder, extract for 6 hours, dry and constant weight.

[0093] (3) Preparation of deep eutectic solvent: mix choline chloride and potassium hydroxide according to the amount of substance 1:1, in ethanol solvent, heat and stir at a reaction temperature of 60°C for 4h, filter, keep the supernatant, and mix according to the substance Lactic acid was added in an amount of 1:1, and after drying by rotary evaporation, it was mixed with lactic acid at a ratio of 1:10, heated at 60°C for 5 hours, and cooled to room temperature to obtain a choline lactate-lactic a...

Embodiment 2

[0099] Poplar raw material was treated with choline formate-formic acid deep eutectic solvent to extract lignin.

[0100] (1) Raw material pretreatment: Take relatively uniform wood chips, air-dry, crush, and then sieve to get 40-60 mesh wood powder.

[0101] (2) Benzyl alcohol extraction: use a benzene-ethanol mixed solution with a volume ratio of 2:1 to carry out benzene alcohol extraction on the wood powder, extract for 6 hours, dry and constant weight.

[0102] (3) Preparation of deep eutectic solvent: mix choline chloride and potassium hydroxide according to the amount of substance 1:1, in ethanol solvent, heat and stir at a reaction temperature of 60°C for 4h, filter, keep the supernatant, and mix according to the substance Add formic acid at a ratio of 1:1, dry by rotary evaporation, mix with formic acid at a ratio of 1:10, heat at 60°C for 5 hours, and cool to room temperature to obtain a choline formic acid-formic acid deep eutectic solvent.

[0103] (4) Deep eutectic ...

Embodiment 3

[0108] The poplar raw material was treated with choline propionate-propionate deep eutectic solvent to extract lignin.

[0109] (1) Raw material pretreatment: Take relatively uniform wood chips, air-dry, crush, and then sieve to get 40-60 mesh wood powder.

[0110] (2) Benzyl alcohol extraction: use a benzene-ethanol mixed solution with a volume ratio of 2:1 to carry out benzene alcohol extraction on the wood powder, extract for 6 hours, dry and constant weight.

[0111] (3) Preparation of deep eutectic solvent: mix choline chloride and potassium hydroxide according to the amount of substance 1:1, in ethanol solvent, heat and stir at a reaction temperature of 60°C for 4h, filter, keep the supernatant, and mix according to the substance Propionic acid was added at a ratio of 1:1, and after drying by rotary evaporation, it was mixed with propionic acid at a ratio of 1:10, heated at 60°C for 5 hours, and cooled to room temperature to obtain a choline propionate-propionate deep eu...

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Abstract

The invention relates to a method for separating holocellulose in wood fibers by using a choline deep-eutectic solvent. The method comprises the following steps: pretreatment of raw materials, benzene-alcohol extraction, preparation of the deep-eutectic solvent, treatment of the deep-eutectic solvent, separation of the holocellulose and recovery of the solvent. The method is characterized in thatchloride ions in the choline deep-eutectic solvent are replaced under a mild condition, a non-toxic hydrogen bond donor is matched, and the deep-eutectic solvent with low halogen content is prepared and is used for separating holocellulose in the wood fibers. The method is high in holocellulose extraction rate, high in purity, simple to operate, obvious in effect, high in practicability, small inpollution and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of biomass refining, and in particular relates to a choline-based deep eutectic solvent and the application of the solvent system in extracting and separating cellulose. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the increasing shortage of petrochemical resources and the increasing pressure of environmental pollution, finding a renewable resource to replace petrochemical resources has become a top priority for sustainable development. Woody biomass resources are mainly composed of cellulose, hemicellulose, and lignin, and are the most widely available and abundant renewable resources on earth. ...

Claims

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Application Information

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IPC IPC(8): D21C3/20C08B37/00
CPCC08B37/0003D21C3/20
Inventor 杨桂花刘金科齐乐天陈嘉川薛玉
Owner QILU UNIV OF TECH
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