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Method for preparing aromatic acid monomer by comprehensively utilizing agricultural waste raw materials

A technology of agricultural waste and aromatic acid, which is applied in the preparation of organic compounds, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of corrosion reactors, harsh reaction conditions, and low depolymerization efficiency, and achieve the goal of reaction The effect of speed increase, short reaction time and low energy consumption

Active Publication Date: 2020-08-04
SUZHOU NACHUANGJIA ENVIRONMENTAL TECH ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The use of catalytic depolymerization of lignin in the prior art has been widely used, but it inevitably faces some problems, such as complicated post-treatment, corrosion of reactors, environmental pollution, etc.
It is precisely because of the complex reaction mechanism of lignin depolymerization, the harsh reaction conditions in the depolymerization process, poor selectivity of depolymerization products, complex products, difficult separation and purification of products, and low depolymerization efficiency.

Method used

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  • Method for preparing aromatic acid monomer by comprehensively utilizing agricultural waste raw materials
  • Method for preparing aromatic acid monomer by comprehensively utilizing agricultural waste raw materials
  • Method for preparing aromatic acid monomer by comprehensively utilizing agricultural waste raw materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Select poplar wood, pulverize with a pulverizer, sieve 0.1mm-4mm particles as the test sample, put 5g dry poplar wood powder into 50mL distilled water containing 5g sulfonic acid functionalized mesoporous SBA-15 silica molecular sieve In the medium, the mechanical stirring rate is 800 rpm, the oil bath temperature is controlled, the temperature is increased to 90 ℃, and the reaction is continued at this temperature for 8 hours. After the reaction is completed, 120 mL of distilled water is added, and the molecular sieve is separated by natural sedimentation. It can be reused, and then filtered and washed with water through a filter membrane, while retaining the precipitated part to obtain a solid product.

[0077] The solid product obtained after washing was added to 100mL distilled water containing 10g of aminopropyl functionalized mesoporous SBA-15 silica molecular sieve, mechanically stirred at 30℃ for 5h, and then centrifuged at 8000r / min 6min, separate the supernatant ...

Embodiment 2～14

[0079] Using the same process as in Example 1, selecting different solid base catalyst quality, solid acid catalyst quality, solid acid catalyst reaction temperature and solid acid catalyst reaction time, lignin solid products with different effects can be obtained. The amount of each material and the reaction conditions are summarized in Table 1.

Embodiment 15

[0088] Disperse 5 g of the lignin prepared in the above examples 1-14 in 100 mL of water, and add 0.5 g of solid base catalyst (aminopropyl functionalized mesoporous SBA-15 silica molecular sieve) to the aqueous solution of lignin , Mechanical stirring for 10 minutes to mix uniformly, the rate of mechanical stirring is 800 rpm, add 5mL of commercially available hydrogen peroxide (mass fraction 30%) into the mixture, at this time the pH is 9.2, under the microwave power of 200W , Stirring for 120 minutes, lignin is effectively converted into aromatic acid monomers.

[0089] Gel permeation chromatography was used to analyze the catalytic degradation products. The results showed that the molecular weight of lignin was significantly reduced after the reaction. The molecular weights of the degradation products were mainly distributed in 164, 194 and 224 Daltons, which correspond to p-coumaric acid, respectively. , Coniferic acid and erucic acid molecular weight.

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Abstract

The invention provides a method for obtaining an aromatic acid monomer from poplar powder, which mainly comprises the following steps of: obtaining poplar powder pulp through solid acid and solid alkali treatment to obtain lignin, and ensuring that the yield of the lignin can be up to 25 percent under the optimal experimental conditions; and preparing p-coumaric acid, coniferic acid and sinapic acid from p-coumaric acid, coniferic acid and sinapic acid through microwave-assisted oxydol oxidative degradation of lignin to obtain aromatic acid monomers; and under optimal experimental conditions,the selectivity of the prepared p-coumaric acid, coniferic acid and sinapic acid reaches 90%, and the conversion rate is 25%. The aromatic acids have important economic values and wide application prospects. Compared with traditional liquid acid and alkali, the method has the advantages of mild experimental conditions, simple process, environmental protection, low energy consumption, high conversion rate, high selectivity and low cost.

Description

Technical field [0001] The present invention relates to solid acid and solid base catalysis technology. Further, the present invention relates to solid acid and solid base combined microwave-assisted oxidative degradation technology, and to the technology of preparing aromatic acid monomers by resource utilization of agricultural waste materials. Background technique [0002] Biomass is recognized as the best source of renewable organic carbon. In recent years, the use of biomass to produce fuels and fine chemicals has attracted widespread attention in the hope that it can partially replace increasingly depleted fossil resources in the future. The conversion and utilization of woody biomass has become a research focus in the field of biorefinery. The conversion and utilization of woody biomass requires the full use of various components of woody biomass. Currently, most researches focus on cellulose and hemicellulose, which are easily converted among the three main components (c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/52C07C59/64C07C51/00C07D307/58
CPCC07C51/00C07D307/58C07G1/00C07C59/52C07C59/64
Inventor 杜鑫栾奕李秀娟
Owner SUZHOU NACHUANGJIA ENVIRONMENTAL TECH ENG CO LTD
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