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A kind of method of producing gamma valerolactone by hemicellulose

A technology of hemicellulose and valerolactone, applied in the direction of organic chemistry, can solve the problems of low industrialization value, easy-to-corrosion reactor, long process line, etc., and achieve the goal of improving utilization rate, high catalyst activity, and reducing environmental pollution Effect

Active Publication Date: 2017-07-28
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above method uses cellulose as a raw material, and the process line is long, and the mixed product after the first step reaction needs to be separated from the liquid acid, which increases the energy consumption of the whole process; the wide use of liquid acid is easy to corrode the reactor, pollute the environment, and is not Good for recycling, low industrial value; reaction requires high-pressure hydrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, weigh 10g of SiO 2 , add chloroauric acid aqueous solution (0.5g+50mL water), stir evenly under ultrasonic conditions for 1h, then add 0.5g sodium borohydride, continue stirring for 1h, centrifuge to separate the solid catalyst, and dry overnight at 80°C to obtain Au / SiO 2 Catalyst, wherein the mass content of Au is 1%.

[0025] Add 2g of xylan-type hemicellulose, 2g of water, 20g of isopropanol and 0.5g of ZSM-5 into the autoclave. Heat the reaction system to 160°C and continue heating for 6h, then add 0.5g Au / SiO after cooling 2 , after reacting at 120° C. for 16 h, the reactor was cooled, the product was taken out, centrifuged, and analyzed by gas chromatography, the total yield of γ-valerolactone reached 55.2%.

Embodiment 2

[0027] Add 2g of xylan-type hemicellulose, 4g of water, 20g of isopropanol and 0.5g of Hmodenite into the autoclave. Heat the reaction system to 160°C and continue heating for 6h, then add the Au / SiO in Example 1 after cooling 2 Catalyst 0.5g, reacted at 120°C for 16h, cooled the reactor, took out the product, centrifuged and analyzed by gas chromatography, the total yield of γ-valerolactone reached 51.9%.

Embodiment 3

[0029] Add 2g of xylan-type hemicellulose, 4g of water, 20g of isopropanol and 0.5g of Amberlyst-15 into the autoclave. Heat the reaction system to 160°C and continue heating for 6h, then add the Au / SiO in Example 1 after cooling 2 Catalyst 0.5g, reacted at 120°C for 16h, cooled the reactor, took out the product, centrifuged and analyzed by gas chromatography, the total yield of γ-valerolactone reached 50.2%.

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PUM

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Abstract

The invention relates to a method for producing gamma-valerolactone from hemicellulose, which comprises the following steps: uniformly mixing hemicellulose, water, isopropanol and solid acid in a mass ratio of (1-10):(1-10):(20-100):1 to prepare a hemicellulose-water-isopropanol reaction mixture, heating the reaction mixture to the reaction temperature of 120-200 DEG C, reacting for 6-10 hours, cooling, and introducing a metal catalyst with equal mass of the solid acid; and continuing heating the reaction mixture to the reaction temperature of 100-160 DEG C, reacting for 12-24 hours, cooling, and separating to obtain the target product gamma-valerolactone. The method has the advantages of simple technique, mild reaction conditions, low energy consumption and no pollution.

Description

technical field [0001] The invention belongs to a method for preparing gamma-valerolactone, in particular to a method for producing gamma-valerolactone from hemicellulose. Background technique [0002] Lignocellulose is the most abundant plant biomass component on the earth. Compared with other biomass resources such as oil and starch, it has the unique advantage of "not competing with people for food and land". Converting lignocellulose into high value-added chemicals and liquid fuels can reduce excessive dependence on fossil resources, protect the earth's environment, and reduce CO 2 emissions and promote the sustainable use of carbon resources. [0003] Hemicellulose widely exists in plants and is an important component of lignocellulose, containing about 20-30%, and widely exists in waste biomass resources such as plant straw, corncobs and pulp, so hemicellulose is used as raw material The production of γ-valerolactone offers a green, economical and sustainable route. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/33
CPCC07D307/33
Inventor 樊卫斌朱善辉王建国秦张峰
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI