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Synthetic method and application of functional bio-based ionic liquid

The technology of an ionic liquid and a synthesis method, which is applied in the field of physical and chemical green energy, can solve problems such as few reports of biomass pretreatment steps, and achieve the effects of good solubility of alkali lignin, low cost and simple synthesis steps.

Active Publication Date: 2019-02-15
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In recent years, bio-based ionic liquids have attracted attention due to their many advantages, but there are few reports on their use in biomass pretreatment steps.

Method used

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  • Synthetic method and application of functional bio-based ionic liquid
  • Synthetic method and application of functional bio-based ionic liquid
  • Synthetic method and application of functional bio-based ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Transfer 0.1mol deionized water into a 100ml three-neck flask, then weigh 0.1mol N,N-dimethylethanolamine (DMEA) and dissolve it in deionized water and stir it with a magnet at room temperature, weigh and dilute the amount of other substances Hydrochloric acid was added dropwise into the three-neck flask. Stirring was continued at room temperature for 24 hours, and then the solvent water was removed under reduced pressure with a rotary evaporator, and fully dried in a vacuum oven to obtain [DMEA][Cl] ionic liquid.

[0027] Alkali lignin KL and [DMEA][Cl] were mixed in a round bottom flask at a mass ratio of 0.5:4.5g, and heated and stirred according to the set pretreatment conditions (reaction temperature 80-160°C, reaction time 30-150min) . The slurry was cooled to room temperature and diluted with a certain amount of deionized water (20-30ml DI water). The pH of the solution was adjusted to 2-3 with diluted HCl and the suspension was placed in a 4°C refrigerator over...

Embodiment 2

[0029] Transfer 0.1mol deionized water into a 100ml three-neck flask, then weigh 0.1mol N,N-dimethylethanolamine (DMEA) and dissolve it in deionized water and stir it with a magnet at room temperature, weigh and dilute the amount of other substances of sulfuric acid was added dropwise into the three-necked flask. Continue to stir at room temperature for 24 hours, then use a rotary evaporator to remove solvent water under reduced pressure, and fully dry in a vacuum oven to obtain [DMEA][HSO 4 ] Ionic liquid.

[0030] Alkali lignin (KL) and [DMEA][HSO 4 ] mixed in a round bottom flask at a mass ratio of 0.5:4.5g, and heated and stirred according to the set pretreatment conditions (reaction temperature 80-160°C, reaction time 30-150min). The slurry was cooled to room temperature and diluted with a certain amount of deionized water (20-30ml DI water). The pH of the solution was adjusted to 2-3 with diluted HCl and the suspension was placed in a 4°C refrigerator overnight to ensu...

Embodiment 3

[0032] Transfer 0.1 mol of anhydrous methanol into a 100ml three-necked flask, then weigh 0.1 mol of N,N-dimethylethanolamine (DMEA), dissolve it in anhydrous methanol and stir it with a magnet at room temperature, and weigh the equivalent amount of Acetic acid was added dropwise into the three-necked flask. Continue to stir at room temperature for 24 hours, and then use a rotary evaporator to remove the solvent anhydrous methanol under reduced pressure, and fully dry in a vacuum oven to obtain [DMEA][OAc] ionic liquid.

[0033] Alkali lignin KL and [DMEA][OAc] are mixed in a round bottom flask at a mass ratio of 0.5:4.5g, and heated according to the set pretreatment conditions (reaction temperature 80-160°C, reaction time 30-150min) Stir. The slurry was cooled to room temperature and diluted with a certain amount of deionized water (20-30ml DI water). The pH of the solution was adjusted to 2-3 with diluted HCl and the suspension was placed in a 4°C refrigerator overnight to ...

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Abstract

The invention discloses a synthetic method of functional bio-based ionic liquid of the same category and application of the ionic liquid in an alkali lignin pretreatment reaction. The synthetic methodcomprises the following steps: taking N,N-dimethylethanolamine (DMEA) as a raw material, synthesizing Br(phi)nsted bio-based ionic liquid of different structures by virtue of acid-base neutralization, and characterizing the structure, heat stability and acid-base property of the ionic liquid by using a nuclear magnetic resonance spectrometer, thermogravimetric analysis, solvatochromism and othermethods. The ionic liquid serves as a green solvent and a catalyst of alkali lignin pretreatment, ether bonds in the alkali lignin structure are subjected to selective rupture at a low temperature soas to form oligomers, and initial depolymerization of an alkali lignin complex macromolecular structure under mild conditions is realized. Experimental data proves that the ionic liquid treatment obviously improves the yield of low-molecular weight compounds in the degradation product, and the conversion rate and selectivity of vanillic aldehyde can reach 40% or higher. The ionic liquid is simplein synthetic method, low in cost, biodegradable, low in toxicity, stable in pretreatment reaction and high in activity.

Description

technical field [0001] The present invention relates to the field of physical chemistry green energy, in particular to the synthesis of a class of ionic liquids with advantages such as low vapor pressure, wide liquid temperature range, good solubility and high thermal stability and their use in the first step pretreatment reaction of efficient conversion of biomass Applications. Background technique [0002] Fossil energy is a non-renewable resource with limited reserves. The rapid development of the global economy has intensified the consumption of fossil energy, and energy depletion is inevitable. As energy issues become increasingly prominent, new energy sources using biomass as raw materials have received more and more attention. Biomass energy is recognized by the international community as an effective resource that can alleviate the energy crisis because of its high reserves, renewable, and no carbon dioxide emissions. As an important part of biomass energy, alkali ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C215/08C07C213/00C07C53/10C07C51/41B01J31/02C07C47/58C07C45/51
CPCB01J31/0279C07C45/51C07C51/412C07C213/00C07C215/08C07C53/10C07C47/58Y02P20/54
Inventor 戴立益王媛媛耿萍阿娜尔古丽·吾甫尔魏秋丽
Owner EAST CHINA NORMAL UNIV