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Method for preparing high-purity vanillin through catalytic oxidation of lignin

A catalytic oxidation and lignin technology, which is applied in the preparation of carbon-based compounds, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of large amount of by-products and difficult separation of vanillin, and achieve low cost and mild preparation conditions , the effect of saving energy

Inactive Publication Date: 2018-03-30
四川爱尔西科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that a large amount of vanillin will be produced at the same time in the preparation of vanillin from existing lignin, which will cause difficulties in the subsequent separation of vanillin. The amount of by-products in the decomposed product is large, and the subsequent separation of vanillin is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for preparing high-purity vanillin by catalytically oxidizing lignin in the present invention comprises mixing lignin with a rhenium-based supported oxide catalyst, adding phenol to stir and dissolve, and degrading lignin under the reaction condition of oxygen pressure of 1-3 MPa to obtain vanillin Aldehyde is the main decomposition product, and the product is separated to obtain vanillin. The reaction conditions also include a reaction temperature of 80-120°C; the rhenium-based supported oxide catalyst is a rhenium-based supported aluminum oxide catalyst; the degradation time of the lignin is 0.5-1 hour; the lignin includes an enzyme Any one or a mixture of lignin, alkali lignin, sodium lignosulfonate, organic solvent lignin.

[0019] As the reaction temperature decreases, the yield of vanillin decreases, and the selectivity of vanillin decreases gradually. When the temperature was 80° C., the selectivity of vanillin was close to 90%, which was far higher th...

Embodiment 2

[0022] The method for preparing high-purity vanillin by catalytically oxidizing lignin in the present invention comprises mixing lignin with a rhenium-based supported aluminum oxide catalyst, adding phenol to stir and dissolve, and performing lignin under the reaction conditions of an oxygen pressure of 2MPa and a reaction temperature of 80°C. Degrade for 0.5-1 hour to obtain a decomposition product mainly composed of vanillin, and separate the product to obtain vanillin; the lignin includes enzymatic lignin, alkali lignin, sodium lignin sulfonate, organic solvent lignin any one or a mixture of several. The selection behavior of vanillin in this example is 90%-92.5%.

Embodiment 3

[0024] The difference from Example 2 is that the reaction temperature is 120° C., and the selection behavior of vanillin in this example is 95%-97%.

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PUM

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Abstract

The invention discloses a method for preparing high-purity vanillin through catalytic oxidation of lignin. The method comprises the steps of: mixing lignin with a rhenium-based loaded oxide catalyst,adding phenol, performing stirring so as to achieve dissolution, degrading lignin under a reaction condition of oxygen pressure of 1-3 MPa to obtain degraded products in which vanillin is dominate, and separating the degraded products to obtain vanillin. According to the method for preparing the high-purity vanillin through catalytic oxidation of lignin, lignin is used as the raw material, phenolis used as the solvent, and the rhenium-based loaded oxide is used as the catalyst; therefore, the preparation conditions are mild, the requirements for the preparation conditions are reduced, the cost is low, the energy consumption is small, and the method is environmentally friendly and safe.

Description

technical field [0001] The invention relates to a method for preparing vanillin, in particular to a method for preparing high-purity vanillin by catalyzing lignin oxidation. Background technique [0002] Vanillin (4-hydroxy-3-methoxybenzaldehyde) has been the main ingredient in natural vanilla flavoring in foods for centuries. Today, it is widely used in various industries. In the food industry, it is used as a flavoring agent in ice cream, beverages, chocolates, baked candies; it is also used as a food preservative in sausages, seasonings, etc. In the cosmetic industry, it is used as a fragrance ingredient in perfumes and face creams; in the chemical industry, it is used as a defoamer, vulcanizing agent and chemical precursor; in the pharmaceutical industry, it is used as an odor masking agent. Recently, vanillin is also used in the synthesis of various intermediates, for example, in the synthesis of various drugs such as levodopa, methyldopa, and papaverine. [0003] Va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/51C07C45/32C07C47/58
CPCC07C45/32C07C45/51C07C47/58
Inventor 罗继忠蔡利平王燕军谭问非苏保宁
Owner 四川爱尔西科技有限公司