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A method for manganese-catalyzed oxidative degradation of lignin into aromatic monomers

A technology of oxidative degradation and catalytic oxidation, which is applied in chemical instruments and methods, preparation of organic compounds, catalysts for physical/chemical processes, etc., can solve problems such as polluting the environment and wasting resources

Active Publication Date: 2021-08-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, lignin is mainly treated as waste in the pulp and paper industry, which not only wastes resources, but also pollutes the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 1.0g poplar sawdust, 0.5g manganese phosphate, and 20mL methanol into a 100mL reactor, oxygenate to 1.0MPa, keep at 200°C for 6h. Cool to room temperature, use GC-MS and compare with standard substances to qualitatively analyze the product, and use external standard method for quantitative analysis; the ratio of the quality of each product obtained to the quality of lignin in the initial feeding amount is its yield.

[0015] The aromatic small molecules in the product mainly include p-hydroxybenzaldehyde, p-hydroxybenzoic acid, methyl p-hydroxybenzoate, vanillin, vanillone, vanillic acid, methyl vanillate, syringaldehyde, syringic acid, and methyl syringate. The yield of the total aromatic small molecule compounds is 59wt%.

Embodiment 2

[0017] Add 1.0g of corn stalks, 0.3g of manganese(III) acetylacetonate, and 30mL of methanol into a 100mL reactor, oxygenate to 0.5MPa, and keep the temperature at 150°C for 8h. Cool to room temperature, adopt embodiment 1 method to carry out qualitative and quantitative analysis to reaction solution.

[0018] The aromatic small molecules in the product mainly include p-hydroxybenzaldehyde, p-hydroxybenzoic acid, methyl p-hydroxybenzoate, vanillin, vanillone, vanillic acid, methyl vanillate, syringaldehyde, syringic acid, and methyl syringate. The yield of the total aromatic small molecule compounds is 51wt%.

Embodiment 3

[0020] Add 1.0g sulfonate lignin, 0.5g manganese(III) acetate, and 20mL ethanol into a 100mL reactor, oxygenate to 1.5MPa, and keep the temperature at 160°C for 5h. Cool to room temperature, adopt embodiment 1 method to carry out qualitative and quantitative analysis to reaction solution.

[0021] The aromatic small molecules in the product mainly include p-hydroxybenzaldehyde, p-hydroxybenzoic acid, ethyl p-hydroxybenzoate, vanillin, vanillone, vanillic acid, ethyl vanillate, syringaldehyde, syringic acid, and ethyl syringate. The yield of the total aromatic small molecule compounds is 50wt%.

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PUM

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Abstract

A method for manganese-catalyzed oxidative degradation of lignin into aromatic monomers. In the method, molecular oxygen is used as an oxygen source, and a metal manganese-based compound is used as a catalyst to catalyze the oxidative degradation of lignin. In this method, the composition of the catalytic oxidation system is simple and green, the operating conditions are mild, and the yield of aromatic monomers (aromatic aldehydes, aromatic ketones, aromatic esters) in the product is high; it is the best choice for the high-value utilization of lignin and even lignocellulose offers the possibility.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of biomass conversion into organic chemicals, specifically: catalytic oxidation and degradation of lignocellulose or lignin to obtain aromatic small molecular units with high added value such as aromatic aldehydes, aromatic ketones, and aromatic esters. Body compounds, so as to realize the effective and high-value utilization of lignin. Background technique [0002] In order to meet the needs of sustainable development, the development and utilization of renewable biomass resources is the focus and difficulty that contemporary society urgently needs to solve. Biomass has a wide range of sources and abundant reserves, and is an important renewable resource. Lignin is one of the main components of plant biomass, and its content is about 15-30wt%. At present, lignin is mainly treated as waste in the pulp and paper industry, which not only wastes resources, but also pollutes the environment....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/42C07C47/565C07C51/00C07C65/03C07C67/00C07C69/84C07C47/58C07C49/84C07C69/76C07C47/575C07C65/21C07C69/92B01J27/187B01J27/25B01J31/22
CPCB01J27/187B01J27/25B01J31/2234B01J31/2239B01J2531/0241B01J2531/72C07C45/42C07C51/00C07C67/00C07C47/565C07C47/575C07C47/58C07C49/84C07C65/03C07C65/21C07C69/84C07C69/76C07C69/92
Inventor 徐杰马阳阳马继平夏飞高进苗虹
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI