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A method for extracting lignin by ternary deep eutectic solvent

A deep eutectic solvent and lignin technology, applied in the field of high-efficiency utilization of biomass resources, can solve the problems of low lignin extraction, insufficient extraction purity, and poor effect, so as to reduce pretreatment costs, improve extraction efficiency, reduce Effects of Environmental Pollution

Active Publication Date: 2022-03-04
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the DES synthesized by using glycerol shows a good effect in electrochemical deposition, but the effect is poor in biomass fractionation. When DES is synthesized by using glycerol as a hydrogen bond donor, the dissolution effect on lignin in straw is poor, and lignin The extraction is not high, and the extraction purity is not enough
Prior art CN109337090A discloses a method for extracting high-activity lignin by using a stabilizer. The method adds a stabilizer to the lignin solvent extraction method, which can increase the extraction rate of lignin to about 60%. The improvement of yield and extraction purity has not yet reached the expectations of this field, and there is no relevant prior art disclosure of DES ternary deep eutectic system for extracting lignin

Method used

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  • A method for extracting lignin by ternary deep eutectic solvent
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  • A method for extracting lignin by ternary deep eutectic solvent

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Embodiment 1

[0044] A method for extracting lignin using a ternary deep eutectic solvent, comprising the steps of:

[0045] S1. Crush the barley straw through a 60-mesh sieve, then dry it in an oven at 105°C, and add 2g of barley straw powder and 30g of DES(TE:GL:AlCl 3 ·6H 2 (2 molar ratio is 1:2:0.05), then it is transferred and placed in a constant temperature oil bath, the setting reaction temperature is 100°C, the rotating speed is 100rpm, and the reaction is 4h. After the reaction is completed, it is cooled to room temperature to obtain the reaction product.

[0046] S2. After reacting for 4 hours, cool the reaction vessel to room temperature, add 90ml of ethanol, then transfer the reaction vessel to a constant temperature magnetic stirrer, set the temperature to 60°C, the rotation speed to 100r / min, and the stirring time to 1h. Cool to room temperature, take out the reactant and perform suction filtration under reduced pressure, wash the filter residue with absolute ethanol, dry th...

Embodiment 2

[0049] A method for extracting lignin using a ternary deep eutectic solvent, comprising the steps of:

[0050] S1. Crush the barley straw through a 60-mesh sieve, then dry it in an oven at 105°C, and add 2g of barley straw powder and 30g of DES(TE:GL:AlCl 3 ·6H 2 O molar ratio is 1:2:0.1). Then it was transferred and placed in a constant temperature oil bath, the reaction temperature was set to 110°C, the rotation speed was 100rpm, and the reaction was carried out for 2 hours. After the reaction was completed, it was cooled to room temperature to obtain the reaction product.

[0051] S2. After reacting for 2 hours, cool the reaction vessel to room temperature, add 90ml of ethanol, then transfer the reaction vessel to a constant temperature magnetic stirrer, set the temperature to 60°C, the rotation speed to 150r / min, and the stirring time to 1h. Cool to room temperature, take out the reactant and perform suction filtration under reduced pressure, wash the filter residue with...

Embodiment 3

[0054] A method for extracting lignin using a ternary deep eutectic solvent, comprising the steps of:

[0055] S1. Crush the barley straw through a 40-mesh sieve, then dry it in an oven at 105°C, and add 2g of barley straw powder and 30g of DES(TE:GL:AlCl 3 ·6H 2 O molar ratio is 1:2:0.2). Then it was transferred and placed in a constant temperature oil bath, the reaction temperature was set to 130°C, the rotation speed was 150rpm, and the reaction was carried out for 3 hours. After the reaction was completed, it was cooled to room temperature to obtain the reaction product.

[0056] S2. After reacting for 3 hours, cool the reaction vessel to room temperature, add 90ml of ethanol, then transfer the reaction vessel to a constant temperature magnetic stirrer, set the temperature to 60°C, the rotation speed to 120r / min, and the stirring time to 2h. Cool to room temperature, take out the reactant and perform suction filtration under reduced pressure, wash the filter residue with...

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Abstract

The invention discloses a method for extracting lignin by using a ternary deep eutectic solvent. The method comprises the steps of: mixing and reacting the raw material with a ternary deep eutectic solvent, cooling to room temperature after the reaction is completed, and obtaining a reaction product, adding the reaction product to absolute ethanol and stirring, washing with ethanol, filtering, concentrating, adding water, and standing , to obtain a precipitate containing lignin, filter, and dry to obtain lignin. The present invention provides a method for extracting lignin from straw by using a ternary deep eutectic solvent, which improves the extraction efficiency of lignin more effectively compared with a binary deep eutectic solvent, and achieves the maximum extraction efficiency within 4 hours The lignin purity is 84±1%, and the purity of the obtained lignin is relatively high, with the highest purity reaching 83%. The deep eutectic solvent and absolute ethanol can be recycled and reused during the extraction process. Problems such as pretreatment cost and environmental pollution are in line with the concept of green and environmental protection development.

Description

technical field [0001] The invention relates to the technical field of high-efficiency utilization of biomass resources, and more specifically, relates to a method for extracting lignin by using a ternary deep eutectic solvent. Background technique [0002] With the increasing depletion of global fossil fuels and the aggravation of environmental pollution, energy and environmental issues have become the main obstacle to the sustainable development of human society today. Therefore, it is becoming increasingly difficult to seek a green and environmentally friendly renewable biomass resource to replace fossil fuels. important. Lignin is a renewable resource second only to cellulose on the earth. According to statistics, plants produce about 50 billion tons of lignin through photosynthesis every year. Therefore, it is particularly urgent to separate and extract lignin efficiently and use lignin. my country is a large agricultural country. With the rapid development of agricult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00B01D11/02
CPCC08H6/00B01D11/0288B01D11/0292
Inventor 林晓清刘耀张可炫郑嘉怡袁淑娴何先达郑晓洁肖江雄潘宝盈陈哲
Owner GUANGDONG UNIV OF TECH
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