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Method for electrochemically degrading lignin in eutecticevaporate solvent

A deep eutectic solvent and lignin technology, applied in the field of fine chemicals, can solve the problems of low current utilization and achieve the effects of low cost, high selectivity, and mild degradation reaction conditions

Inactive Publication Date: 2017-07-28
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above aqueous phase system, along with the electrochemical oxidative degradation of lignin, the oxygen evolution reaction proceeds simultaneously, that is, part of the current is used for the breaking reaction of carbon-carbon bonds and carbon-oxygen bonds in lignin, and part of the current is used for oxygen evolution. low rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for electrochemically degrading lignin in a deep eutectic solvent is achieved through the following steps:

[0020] (1) Choline hydrochloride and urea are mixed and heated at a ratio of 1:2 to obtain a uniform, transparent and colorless deep eutectic solvent, and the lignin introduced with sulfonic acid groups is dissolved in the deep eutectic solvent to form a homogeneous system. The concentration is 10g / L;

[0021] (2) Add the prepared lignin homogeneous system into the electrolytic cell composed of three electrodes, use the nickel electrode as the working electrode, the platinum electrode as the auxiliary electrode, and the reference electrode as the silver / silver chloride electrode, and set the oxidation potential 0.5V, the reaction time is 5h, the electrocatalytic oxidation degrades lignin, the yield of guaiacol is 38%, the yield of vanillin is 36%, and the conversion rate of lignin is 87%;

[0022] (3) Press V 酸 :V 电解液 Dilute the reacted electrolyte wi...

Embodiment 2

[0024] A method for electrochemically degrading lignin in a deep eutectic solvent is achieved through the following steps:

[0025] (1) Choline hydrochloride and ethylene glycol are mixed and heated at a ratio of 1:2 to obtain a uniform transparent and colorless deep eutectic solvent, and the lignin introduced with sulfonic acid groups is dissolved in the deep eutectic solvent to form a homogeneous system. The concentration of lignin is 20g / L;

[0026] (2) Add the prepared lignin homogeneous system into the electrolytic cell composed of three electrodes, use the platinum electrode as the working electrode, the carbon electrode as the auxiliary electrode, the reference electrode as the saturated calomel electrode, and set the oxidation potential as 1V , the reaction time is 24h, the electrocatalytic oxidation degrades lignin, the yield of guaiacol is 38%, the yield of vanillin is 37%, and the conversion rate of lignin is 95%;

[0027] (3) Press V 酸 :V 电解液 Dilute the reacted ...

Embodiment 3

[0029] A method for electrochemically degrading lignin in a deep eutectic solvent is achieved through the following steps:

[0030] (1) N, N-diethylethanolammonium chloride and glycerol are mixed and heated at a ratio of 1:3 to obtain a uniform, transparent and colorless deep eutectic solvent, and the lignin introduced with sulfonic acid groups is dissolved in the low eutectic solvent A homogeneous system is formed in the molten solvent, and the concentration of lignin is 40g / L;

[0031] (2) Add the prepared lignin homogeneous system into the electrolytic cell composed of three electrodes, use gold as the working electrode, platinum electrode as the auxiliary electrode, and the reference electrode as the hydrogen electrode, set the oxidation potential to 1V, and the reaction time For 3 hours, the electrocatalytic oxidation degrades lignin, the yield of guaiacol is 36%, the yield of vanillin is 35%, and the conversion rate of lignin is 85%;

[0032] (3) Press V 酸 :V 电解液 Dilu...

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PUM

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Abstract

The invention discloses a method for electrochemically degrading lignin in an eutecticevaporate solvent. The method comprises the steps that the lignin introduced with sulfonic acid groups is dissolved in the eutecticevaporate solvent, electrocatalytic oxydative degradation of the lignin is carried out in an electrolytic cell formed by three electrodes, and the lignin and the eutecticevaporate solvent in an electrolyte after reaction are recovered for cyclic utilization. The invention provides the method for degrading the lignin. The method has the advantages of being mild in conditions, high in electricity utilization rate, high in conversion rate and selectivity, capable of realizing cyclic utilization, environmentally friendly and capable of enabling the lignin to be degraded so as to obtain more useful and fine chemical products, and having good development prospect and industrial application value.

Description

technical field [0001] The invention belongs to the technical field of value-added transformation and utilization of lignin resources, and relates to a technical method for electrochemically oxidatively degrading lignin for producing fine chemicals such as vanillin and guaiacol. Background technique [0002] Lignin is an abundant renewable resource that can be used to prepare aromatic structural monomers. Traditional industrial processes burn lignin for energy. Recent advances in bioengineering have enabled the conversion of cellulosic biomass into liquid fuels on the one hand and the production of large quantities of lignin on the other. Therefore, there is an urgent need to convert lignin into high-value compounds represented by fuels, additives and fine chemicals. A variety of valuable products can be produced from lignin, so the degradation process of lignin has attracted much attention. The core of lignin degradation is to convert lignin natural macromolecules into m...

Claims

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Application Information

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IPC IPC(8): C25B3/02C25B15/08C25B3/23
CPCC25B15/08C25B3/23
Inventor 李莹王慧奇王延忠胡胜亮董英鸽
Owner ZHONGBEI UNIV
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