Method for oxidative degradation of lignin into aromatic monomers through molybdenum catalysis

A technology of oxidative degradation and lignin, applied in the field of comprehensive utilization of biomass conversion to organic chemicals, can solve the problems of low yield of target aromatic monomers and harsh operating conditions, and achieve mild operating conditions, high yield, and degradation system. simple effect

Active Publication Date: 2018-12-07
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

The reported lignin conversion methods, such as thermal cracking, supercritical conversion, acid-base hydrolysis, etc., all have the disadvantages of harsh operating conditions and low yield of target aromatic monomers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 1.0g poplar sawdust, 0.5g oxymolybdenum acetylacetonate, and 30mL methanol into a 100mL reactor, oxygenate to 1.0MPa, and keep the temperature at 180°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 feed is its yield.

[0015] The aromatic monomers 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 68wt%.

Embodiment 2

[0017] Add 1.0g of beech sawdust, 0.5g of molybdenum trioxide, and 30mL of ethanol into a 100mL reactor, oxygenate to 1.0MPa, and keep the temperature at 150°C for 5h. 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, 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 62wt%.

Embodiment 3

[0020] Add 1.0g of sulfonate lignin, 0.2g of sodium molybdate, and 30mL of ethylene glycol into a 100mL reaction kettle, oxygenate to 1.0MPa, and keep the temperature at 120°C for 10h. 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 60wt%.

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Abstract

The invention relates to a method for oxidative degradation of lignin into aromatic monomers through molybdenum catalysis. According to the method, the oxidative degradation of the lignin is catalyzedby taking molecular oxygen as an oxygen supply and taking a non-noble metal molybdenum compound as a catalyst. According to the method, the catalytic oxidation system is simple in composition and isenvironmentally friendly, the operating conditions are moderate, and the yield of the aromatic monomers (mainly aromatic aldehyde, aromatic ketone and aromatic acid ester) in a degradation product ishigh; and possibility is provided for the high-value utilization of native lignin and even lignocellulose.

Description

technical field [0001] The present 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 molecule units with high added value such as aromatic aldehydes, aromatic ketones, aromatic esters, etc. Body compounds, so as to realize the effective and high-value utilization of lignin. Background technique [0002] Traditional fossil resources such as coal and oil are being consumed day by day, and environmental pollution and other problems are becoming more and more serious. The development and utilization of renewable biomass resources to achieve sustainable development is the focus and difficulty that contemporary society urgently needs to solve. Biomass resources widely exist in nature and are abundant and renewable. The main components of plant biomass include cellulose, hemicellulose, lignin, etc., wherein the content of li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/32C07C47/565C07C47/58C07C47/575C07C49/84C07C65/03C07C65/21C07C51/21C07C69/84C07C69/92C07C67/39
CPCC07C45/32C07C51/21C07C67/39C07C47/565C07C47/58C07C47/575C07C49/84C07C65/03C07C65/21C07C69/84C07C69/92
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
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