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Method for preparing 2,5-dimethyl furan

A technology of dimethylfuran and hydroxymethylfurfural, applied in the direction of organic chemistry, etc., can solve the problems of low application value and low DMF yield

Active Publication Date: 2014-02-05
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The method productive rate of the disclosed preparation DMF of prior art is lower, so the actual application value of these methods is not high

Method used

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  • Method for preparing 2,5-dimethyl furan
  • Method for preparing 2,5-dimethyl furan
  • Method for preparing 2,5-dimethyl furan

Examples

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preparation example Construction

[0036] The invention provides a kind of preparation method of 2,5-dimethylfuran, comprising the following steps:

[0037] Under the action of a nickel-based metal catalyst, 5-hydroxymethylfurfural is hydrogenolyzed in a solvent to obtain 2,5-dimethylfuran;

[0038] The nickel-based metal catalyst is a supported bimetallic catalyst;

[0039] The effective active components of the nickel-based metal catalyst include nickel and tungsten.

[0040] The method provided by the invention adopts a nickel-based metal catalyst with nickel and tungsten as active ingredients to catalyze HMF for hydrogenolysis to obtain DMF. The nickel component has a good hydrogenation ability and can hydrogenate aldehyde groups into methylol groups. group; the tungsten component has good Lewis acidity, which can promote the breakage of the carbon-oxygen bond in the hydrogenolysis process of HMF, and convert the methylol group into a methyl group; under the dual action of nickel and tungsten, HMF can be ...

Embodiment 1

[0090] Mix a certain proportion of nickel nitrate, ammonium metatungstate and activated carbon after weighing, so that the content of nickel in the resulting mixture is 7wt%, and the content of tungsten is 30wt%, and the mixture is placed in a dry flask with a stirring magnet Mix well, then add just enough distilled water to submerge the activated carbon into the flask.

[0091] Immerse the nickel nitrate, ammonium metatungstate and activated carbon in the above-mentioned flask for 12 hours, then place the impregnated product in a 90°C drying oven and dry the obtained dried product at 120°C for the first 6 Hours, the precursor of nickel-ditungsten carbide catalyst supported by activated carbon was obtained.

[0092] The precursor of the nickel-tungsten carbide catalyst obtained above with activated carbon as a carrier is 50mL / min at a hydrogen flow rate, and the nitrogen flow rate is 100mL / min for a second calcination. The process of the second calcination is: Heating at a he...

Embodiment 2

[0095] According to the technical scheme of embodiment 1, prepare the nickel-tungsten carbide catalyst with activated carbon as the carrier; the difference from embodiment 1 is to adjust the mixing ratio of nickel nitrate, ammonium metatungstate and activated carbon, so that the obtained nickel nitrate, metatungsten The content of nickel in the mixture of ammonium nitrate and activated carbon is 2wt%, and the content of tungsten is 30wt%.

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Abstract

The invention provides a method for preparing 2,5-dimethyl furan. The method comprises the following steps: under the action of a nickel metal catalyst, performing a hydrogenolysis reaction on 5-hydroxymethyl furfural in a solvent so as to obtain the 2,5-dimethyl furan, wherein the nickel metal catalyst is a loaded type double-metal catalyst; the nickel metal catalyst comprises effective active components including nickel and tungsten. According to the method provided by the invention, the nickel metal catalyst which takes nickel and tungsten as the effective components is adopted to catalyze HMF (Hydroxymethyl Furfural) to perform hydrogenolysis so as to obtain DMF (Dimethyl Formamide); the component nickel has a good hydrogenation capability, and can perform hydrogenation on an aldehyde group to be a hydroxymethyl group; the component tungsten has good Lewis acidity, can prompt breakage of a carbon-oxygen bond on the hydrogenolysis process of HMF, and can convert the hydroxymethyl group into a methyl group; under the dual functions of nickel and tungsten, the HMF can be efficiently and selectively converted into the DMF, and therefore, the yield of the DMF is relatively high.

Description

technical field [0001] The invention relates to the technical field of organic matter preparation, in particular to a preparation method of 2,5-dimethylfuran. Background technique [0002] 2,5-Dimethylfuran (DMF) is a fuel molecule that is insoluble in water but readily soluble in gasoline. Studies have shown that DMF has an energy density of 30MJ / L, a boiling point of 92°C to 94°C, and an octane number of 119. Compared with ethanol and bioethanol, DMF has better combustion performance. Therefore, DMF is considered as a fuel molecule with great potential and can be used as a fuel additive. [0003] At present, DMF is mainly prepared by hydrogenolysis of 5-hydroxymethylfurfural under the action of a catalyst. The catalysts for preparing DMF include copper-ruthenium catalysts, palladium-carbon catalysts, and the like. For example, the two-step method proposed by Dumesic of the University of Wisconsin in the United States to prepare DMF: the first step is to dehydrate fructo...

Claims

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Application Information

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IPC IPC(8): C07D307/36
CPCC07D307/36
Inventor 傅尧黄耀兵严龙郭庆祥
Owner UNIV OF SCI & TECH OF CHINA
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