Method for preparing 5-hydroxymethylfurfural

A technology of hydroxymethylfurfural and II-2, which is applied in the field of preparing 5-hydroxymethylfurfural, can solve the problems of poor HMF selectivity, low yield, and many by-products, and achieve simple process, low cost, The effect of reducing the production of by-products

Pending Publication Date: 2021-12-31
ZHEJIANG SUGAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of simple and convenient method for preparing HMF by the pressure of carbohydrate containing six-carbon sugar basic structural unit. High, severe coking, many by-products, poor HMF selectivity, low yield, etc.

Method used

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  • Method for preparing 5-hydroxymethylfurfural
  • Method for preparing 5-hydroxymethylfurfural
  • Method for preparing 5-hydroxymethylfurfural

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] In the reactor, put the prepared potassium chloride: water = 3:1 salt solution into the reactor, heat to 80°C, stir evenly, add crystalline fructose: salt solution: Nafion-H solid acid catalyst = 10:3 :0.1. During the reaction process, heat and stir to make the system materials fully contact.

[0061] The pressure of the reaction system was adjusted, the reaction temperature was 80° C., and the reaction time was 5 h.

[0062] pressure sugar conversion rate HMF reaction yield -0.015 100％ 78.3％ -0.025 100％ 78.5％ -0.035 100％ 79.8％ -0.045 100％ 85.5％ -0.04 100％ 92.3％ -0.065 100％ 97.5％ -0.075 100％ 95.7％ -0.08 100％ 90.8％ -0.085 100％ 87.3％ -0.095 100％ 83.1％ -0.1 100％ 80.1％

Embodiment 2

[0064] In the reactor, put the prepared potassium chloride: water = 3: 1 salt solution into the reactor, heat to 80 ° C, stir evenly, add crystallized fructose: salt solution: Nafion-H solid acid catalyst = 10: 3 : 0.1. During the reaction process, heat and stir to make the system materials fully contact.

[0065] The pressure of the reaction system in the first stage was adjusted, the reaction temperature was 80° C., and the reaction time was 1 h.

[0066] The pressure of the reaction system in the second stage was adjusted, wherein the reaction temperature was 80° C., and the reaction time was 4 h. Detection of sugar conversion rate and HMF reaction yield.

[0067] first stage pressure second stage pressure sugar conversion rate HMF reaction yield -0.015 -0.045 100％ 79.1％ -0.025 -0.055 100％ 79.5％ -0.035 -0.065 100％ 94.6％ -0.045 -0.075 100％ 84.1％ -0.045 -0.08 100％ 84.9％ -0.045 -0.095 100％ 82.5％ -0.025 -0.065 10...

Embodiment 3

[0069] In the reactor, put the prepared salt: water = 3: 1 salt solution into the reactor, heat to 80 ° C, stir evenly, add crystallized fructose: salt solution: Nafion-H solid acid catalyst = 10: 3: 0.1 . During the reaction process, heat and stir to make the system materials fully contact.

[0070] Adjust the pressure of the reaction system to -0.035 MPa, the reaction temperature to 80° C., and the reaction time to 1 h.

[0071] The pressure of the reaction system in the second stage was adjusted to -0.075MPa, the reaction temperature was 80°C, and the reaction time was 4h.

[0072] Salt sugar conversion rate HMF reaction yield Sodium chloride 100％ 97.50％ calcium chloride 100％ 90.50％ sodium sulfate 100％ 91.30％ potassium bromide 100％ 94.10％ magnesium sulfate 100％ 94.30％ lithium carbonate 100％ 92.20％ Tetraethylammonium bromide 100％ 95.60％ Tetrabutylammonium chloride 100％ 95.90％ 1-Ethyl-3-methylimidazol...

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Abstract

The invention discloses a method for preparing 5-hydroxymethylfurfural. The method comprises the following steps: mixing materials containing a salt solution, a carbohydrate and a catalyst, and performing reaction I to obtain the 5-hydroxymethylfurfural, wherein the pressure of the reaction I is (-0.1)-(-0.015) Mpa. According to the preparation method disclosed by the invention, the HMF yield of 99% can be obtained, and meanwhile, the pressure of a reaction system is adjusted, so that relatively high reactant conversion rate and reaction product selectivity can be obtained.

Description

technical field [0001] The invention relates to a method for preparing 5-hydroxymethylfurfural, which belongs to the field of chemical materials. Background technique [0002] With the excessive exploitation and utilization of fossil fuels, the world is facing severe energy crisis and environmental pollution. To alleviate these problems, developing biomass fuels that are clean, recyclable alternatives to fossil fuels is a hot topic of current research. HMF, that is, 5-hydroxymethylfurfural, as a platform compound, plays an important role in the field of biomass energy. Through its reduction and oxidation, a large number of derivatives can be obtained, such as DMF, BHMF, etc. These derivatives can be used as fossil fuels alternatives to alleviate the current energy crisis. HMF is produced by dehydration of biomass. The molecule contains a hydroxymethyl group, an aldehyde group and a furan ring. Its chemical properties are relatively active, and various derivatives can be pr...

Claims

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Application Information

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IPC IPC(8): C07D307/46
CPCC07D307/46Y02P20/584
Inventor 张建杨勇金海涛陈晨方乾全卢国文
Owner ZHEJIANG SUGAR ENERGY TECH CO LTD
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