Lignin depolymerization method

A technology for lignin and enzymatic hydrolysis of lignin, applied in the field of lignin conversion, can solve problems such as unfavorable recycling of molten salt hydrate, and achieve the effects of being conducive to recycling, mild reaction conditions and environmental friendliness

Inactive Publication Date: 2018-02-02
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the utilization of hydrohalic acid puts pressure on environmental pollution, and it is also unfavorable to the recovery and utilization of molten salt hydrate

Method used

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  • Lignin depolymerization method
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  • Lignin depolymerization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Suspend 2g of Kraft lignin and 0.2g of D001 macroporous strongly acidic cation exchange resin in 20mL of ZnCl 2 Stir evenly in the molten salt hydrate, react at 90°C for 0.5h; after the reaction solution is cooled, filter it with suction, wash with water 3-4 times, and dry it in vacuum to obtain the degradation product with a yield of 92%.

Embodiment 2

[0024] Suspend 2g of Kraft lignin and 0.5g of 002SC strongly acidic styrene-based cation exchange resin in 20mL of ZnBr 2 Stir evenly in the molten salt hydrate, and react at 100°C for 1 hour; after the reaction solution is cooled, filter it with suction, wash it with water for 3-4 times, and dry it in vacuum to obtain the degradation product with a yield of 91%.

Embodiment 3

[0026] Suspend 2g of Kraft lignin and 1g of 002SC strongly acidic styrene-based cation exchange resin in 20mL of CuBr 2 Stir evenly in the molten salt hydrate, and react at 110°C for 2 hours; after the reaction liquid is cooled, filter it with suction, wash it with water for 3-4 times, and dry it in vacuum to obtain the degradation product with a yield of 85%.

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Abstract

A lignin depolymerization method comprises the following steps: suspending 2 g of lignin and 0.2-1.2 g of a catalyst in 20 mL of a molten salt hydrate in a mass ratio, performing uniform stirring, andreacting the obtained mixture at 90-150 DEG C for 0.5-5 h; and cooling the obtained reaction solution, performing suction filtration, performing water washing 3-4 times, and performing vacuum dryingto obtain a degradation product. The method has the advantages of mild reaction conditions, quick and high-efficiency reacting, effective degradation of beta-O-4 bonds in lignin, and realization of cost reduction and environmental protection by resin acid and the molten salt hydrate.

Description

technical field [0001] The invention belongs to the technical field of lignin conversion, and specifically provides a lignin depolymerization method. Background technique [0002] Due to fossil fuel shortages and growing environmental concerns, lignocellulosic biomass is considered as a potential feedstock and sustainable resource for the production of liquid fuels and chemicals. Over the past decade, major breakthroughs have been achieved in the conversion of carbohydrates from lignocellulosic biomass sources (cellulose and hemicellulose), such as the development of second-generation biofuels (cellulose conversion to bioethanol) and biobased chemical Substances (lactic acid, succinic acid, levulinic acid and their derivatives, etc.) [Kloekhorst, A.; Heeres, H.J. ACS Sustainable Chem. Eng. 2015, 3, 1905-1914]. However, lignin, the second largest natural polymer after cellulose, has not been effectively utilized due to the complexity of lignin structure, polydispersity of ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07G1/00
CPCC07G1/00
Inventor 杨晓慧周永红贾普友博采颖
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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