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Method for catalyzing hydrodeoxygenation of lignin model compound vanillic aldehyde by metallic nickel

A technology of vanillin and lignin, which is applied in the field of homogeneous catalytic reaction system, can solve the problems of inability to use in large quantities and high cost of precious metals, and achieve the effects of inability to use in large quantities, high activity, and avoid cumbersome processes

Inactive Publication Date: 2019-11-22
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high cost of precious metals and the inability to use them in large quantities in the hydrogenation reaction of vanillin, and to provide a method for the hydrogenation and deoxygenation of vanillin, a model lignin compound, catalyzed by homogeneous nickel with high efficiency. Catalyzing the hydrogenation reduction of vanillin, non-noble metal nickel can make up for the shortcomings of precious metals that cannot be used in large quantities, and the homogeneous reaction has the characteristics of high activity and good selectivity

Method used

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  • Method for catalyzing hydrodeoxygenation of lignin model compound vanillic aldehyde by metallic nickel

Examples

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Effect test

Embodiment 1

[0017] With vanillin as substrate, 5mL methanol as solvent, add 0.001g catalyst (Ni(NO 3 ) 2 ·6H 2 (2) and the vanillin of 0.1g, charge 2MPa hydrogen in the reaction kettle, under the condition of 160 ℃, stirring speed 350 rev / mins at temperature, react 4 hours, use gas chromatographic analysis reaction result; The conversion rate of vanillin was >99.9%, and the yield of tetramethylguaiacol was 17.9%.

Embodiment 2

[0019] With vanillin as substrate, 15mL methanol as solvent, add 0.01g catalyst (Ni(NO 3 ) 2 ·6H 2 (2) and the vanillin of 0.1g, charge 2MPa hydrogen in the reaction kettle, under the condition of 200 ℃, stirring speed 500 rev / mins at temperature, react 10 hours, use gas chromatography analysis reaction result; The conversion rate of vanillin was >99.9%, and the yield of tetramethylguaiacol was 91.6%.

Embodiment 3

[0021] With vanillin as substrate, 500mL methanol as solvent, add 0.5g catalyst (Ni(NO 3 ) 2 ·6H 2 (2) and 5g of vanillin, charge 2MPa hydrogen in the reactor, under the condition of 240 DEG C and stirring speed of 1450 rev / min at temperature, react for 20 hours, use gas chromatography to analyze the reaction results; the transformation rate of vanillin is >99.9%, the yield of tetramethylguaiacol was 70.3%.

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Abstract

The invention discloses a method for catalyzing hydrodeoxygenation of lignin model compound vanillic aldehyde by metallic nickel. According to the method, the lignin model compound that is the vanillic aldehyde is used as a substrate; various nickel salts are used as homogeneous catalysts and uniformly dissolved in a reaction solvent so as to completely contact and enables reaction of a reactant,such that the homogeneous reaction process has characteristics of high activity and good selectivity, the reaction mechanism existing in the whole catalysis process can be conveniently researched fromthe molecular level, and the disadvantages of complex catalyst preparation process, easy catalyst poisoning deactivation and the like during the heterogeneous catalysis process are avoided. The influence of the various nickel salts on hydrodeoxygenation reduction of the vanillic aldehyde into tetramethyl guaiacol is studied, and the influence of the addition amount, the reaction time, the reaction pressure and the reaction temperature of the nickel salts is investigated.

Description

technical field [0001] The invention belongs to the technical field of high-efficiency homogeneous catalysis, and relates to a homogeneous catalyzed reaction system for hydrogenation and reduction of lignin model substance vanillin into high value-added chemical flavors and fragrances and biomass oil. Study on the hydrodeoxygenation of vanillin, a lignin model compound, catalyzed by noble metal nickel salt under certain conditions. Background technique [0002] The use of traditional fossil energy has brought various problems to human life. Global warming is getting worse and natural disasters are happening more and more frequently, which has caused great losses to our daily life. However, human demand for energy is still growing. The development of new energy sources to replace traditional fossil energy sources is a hot topic in current research. At present, various countries have done a lot of research on the development and utilization of new energy. [0003] Biomass i...

Claims

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Application Information

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IPC IPC(8): C07C41/18C07C41/30C07C43/23C07C41/56C07C43/315
CPCC07C41/18C07C41/30C07C41/56C07C43/23C07C43/315
Inventor 仝新利郭鹏飞廖圣云白鹏高艺绮
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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