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Eutectic solvent and application of eutectic solvent in lignin extraction

A deep eutectic solvent and lignin technology, applied in the field of biomass refining, can solve problems such as instrument corrosion, fiber degeneration, and acceleration equipment, and achieve the effects of low environmental pollution, low cost, and low molecular weight

Active Publication Date: 2019-12-06
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 distribution of negative charges is too concentrated, requiring a higher temperature to reach its melting point and fully interact with the fiber (Heng Zhou, Hu Qiulong, Su Xiaojun, et al., Research Progress in Ionic Liquids Dissolving Lignocellulose and Its Components [J].Chemical and Biological Engineering, 2012,29(9):1-5.), the pyrolysis products at this time may cause fibrosis (Ebner G, Schiehser S, Potthast A, et al.Side reaction of cellulose with common 1-alkyl-3-methylimidazolium-based ionic liquids[J].TetrahedronLetters,2008,49(51):7322-7324.), and produce toxic metal halides (Gorman-Lewis D J, Fein JB.Experimental Study of the Adsorption of an Ionic Liquid onto Bacterial and Mineral Surfaces[J].Environmental Science&Technology, 2004,38(8):2491-2495.), at the same time, it will cause corrosion of the instrument during use and accelerate equipment aging (Arenas M F, Reddy R G .Corrosion of steel in ionic liquids[J].Journal of Mining&Metallurgy,2003,39(1-2):81-91.)

Method used

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  • Eutectic solvent and application of eutectic solvent in lignin extraction
  • Eutectic solvent and application of eutectic solvent in lignin extraction
  • Eutectic solvent and application of eutectic solvent in lignin extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Lignin was extracted by treating poplar raw material with lactic acid choline-lactic acid deep eutectic solvent.

[0068] (1) Raw material pretreatment: Take relatively uniform wood chips, air-dry, crush, and then sieve to get 40-60 mesh wood powder.

[0069] (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 flour, extract for 6-8 hours, dry and constant weight.

[0070] (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 acid deep eutect...

Embodiment 2

[0076] Poplar raw material was treated with choline formate-formic acid deep eutectic solvent to extract lignin.

[0077] (1) Raw material pretreatment: Take relatively uniform wood chips, air-dry, crush, and then sieve to get 40-60 mesh wood powder.

[0078] (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 flour, extract for 6-8 hours, dry and constant weight.

[0079] (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.

[0080] (4) Deep eutect...

Embodiment 3

[0085] The poplar raw material was treated with choline propionate-propionate deep eutectic solvent to extract lignin.

[0086] (1) Raw material pretreatment: Take relatively uniform wood chips, air-dry, crush, and then sieve to get 40-60 mesh wood powder.

[0087] (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 flour, extract for 6-8 hours, dry and constant weight.

[0088] (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 e...

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Abstract

The present disclosure belongs to the technical field of biomass refining, and particularly relates to an eutectic solvent and an application of the eutectic solvent in lignin extraction. Eutectic solvents are composed of a certain amount of hydrogen-bond donors and hydrogen-bond acceptors, and are economical and environment-friendly green solvents, and among the eutectic solvents, choline-based eutectic solvents are widely used in lignocellulose extraction. Inventors find that due to the presence of chloride ions in the choline chloride-based eutectic solvents, negative charges can be intensively distributed, the extraction efficiency can be reduced, and the aging of an instrument can be accelerated. The present disclosure provides the eutectic solvent with a low halogen content, and organic acid radical ions are adopted to replace halogen anions in choline chloride. Research of the present disclosure proves that the method has a high lignin extraction rate, high purity, simple operation, an obvious effect, high practicability, small pollution, and easy promotion.

Description

technical field [0001] The disclosure belongs to the technical field of biomass refining, and in particular relates to a deep eutectic solvent with low halogen content and the application of the solvent system in extracting and separating lignin. Background technique [0002] The information disclosed in this Background section is only intended to increase the understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is 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...

Claims

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Application Information

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IPC IPC(8): C07C215/40C07C213/08C07C59/08C07C53/06C07C53/122C07C51/41B01D11/02C08H7/00
CPCB01D11/0288C07C51/412C07C53/06C07C53/122C07C59/08C07C213/08C07C215/40C08H6/00C07G1/00
Inventor 杨桂花齐乐天刘金科陈嘉川
Owner QILU UNIV OF TECH
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