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Method for producing furfuraldehyde from pentose solution by adopting impinging stream reactor

A technology of impinging flow reactor and pentose sugar, applied in the direction of organic chemistry, etc.

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned patents, the extractant and the pentose sugar solution are contacted and reacted countercurrently in the packed extraction tower, but the mixing effect of the packed tower is poor, and the serious side reactions lead to a low yield of furfural, with a maximum of only 70%; the condensation products generated by the side reactions are also It will accumulate on the surface of the filler and cause the filler to block, making the production process impossible to carry out for a long time; in addition, the above-mentioned inventive method cannot reclaim the acetic acid and formic acid of the pentose solution at the same time, and if the reacted aqueous solution is directly discharged, it will not only cause serious environmental pollution, but also waste of precious resources

Method used

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  • Method for producing furfuraldehyde from pentose solution by adopting impinging stream reactor
  • Method for producing furfuraldehyde from pentose solution by adopting impinging stream reactor
  • Method for producing furfuraldehyde from pentose solution by adopting impinging stream reactor

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Experimental program
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Effect test

Embodiment 1

[0039] The extractant is a mixed solvent of benzene, ethyl acetate and 1,1,1-trichloroethane, wherein benzene accounts for 40 wt%, ethyl acetate accounts for 20 wt%, and 1,1,1-trichloroethane accounts for 40 wt%.

[0040] The feed ratio of extractant and pentose solution is 3:1 (volume ratio), and the feed rate of extractant and pentose solution is equal to the impinging flow reactor volume (that is, the feed volume space velocity is 1h -1 , that is, the reaction time is 1 h), pump the extractant and the pentose solution into the impinging flow reactor respectively, and quickly mix with the circulating material in the impinging flow reactor to react—extraction process, the circulating material rate is 200% of the amount of material. Control the reaction temperature at 200 °C and the reaction pressure at 3 MPa.

[0041] The experimental results showed that the conversion rate of pentose sugar was 97.4%, the yield of furfural was 82.1%, the recovery rate of acetic acid was 90.9...

Embodiment 2

[0044] The experimental results showed that the conversion rate of pentose sugar was 78.1%, the yield of furfural was 61.4%, the recovery rate of acetic acid was 93.8%, and the recovery rate of formic acid was 90.8%.

[0045] Example 3

Embodiment 3

[0047] The experimental results showed that the conversion rate of pentose sugar was 99%, the yield of furfural was 82.5%, the recovery rate of acetic acid was 93.9%, and the recovery rate of formic acid was 90.9%.

[0048] Example 4

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Abstract

The invention provides a method for producing furfuraldehyde from pentose solution by adopting an impinging stream reactor. The method for producing furfuraldehyde from pentose solution by adopting the impinging stream reactor comprises the following steps: introducing pentose solution and an extraction agent into an impinging stream reactor, reacting under the condition that furfuraldehyde is generated by virtue of pentose, cooling reaction effluent, and layering, wherein an aqueous phase is formed at an upper layer, an extraction phase is formed at a lower layer, the aqueous phase can be recycled as water for hydrolysis of hemicellulose, the extraction phase enters an extraction agent regenerating tower to be further separated, phase splitting is carried out on products at tower top to obtain recycled extraction agent and a small amount of recycled water, the extraction agent can be recycled, products at the bottom of the regenerating tower enter a furfuraldehyde finished product tower to be further separated, acetic acid and formic acid are obtained at the top of the furfuraldehyde finished product tower, and furfuraldehyde is obtained at the bottom of the furfuraldehyde finished product tower; and acetic acid and formic acid enter an acetic acid refining tower to be further separated, formic acid is obtained at the top of the acetic acid refining tower, and acetic acid is obtained at the bottom of the acetic acid refining tower. The method for producing furfuraldehyde from pentose solution by adopting the impinging stream reactor has the advantages that the impinging stream reactor is adopted for producing furfuraldehyde, mass transfer rate is high, side reaction is hardly carried out, and yield of furfuraldehyde is increased; meanwhile, furfuraldehyde, acetic acid and formic acid are recycled, and no waste liquid is discharged, so that the method for producing furfuraldehyde from pentose solution by adopting the impinging stream reactor is an environment-friendly technology.

Description

technical field [0001] The invention relates to a method for producing furfural from a pentose sugar solution, in particular to a method for producing furfural by using a high-efficiency mixing reactor and simultaneously producing formic acid and acetic acid by-products. Background technique [0002] Furfural, also known as furfural. Due to the existence of functional groups such as aldehyde groups, dienes, and cyclic ethers in the molecular structure of furfural, it has the properties of aldehydes, ethers, dienes, and aromatic compounds, and can participate in many different types of reactions and synthesize a variety of chemical products. It is used in food, medicine, synthetic resin, casting and many other production fields. [0003] Currently, furfural is produced from plant fibers rich in pentosan, such as corn cobs, bagasse, corn stalks, and rice husks. The principle is that pentosan is firstly hydrolyzed into pentose, and then the pentose is dehydrated and cyclized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48
CPCC07D307/48
Inventor 薄德臣王阳峰孟凡忠王璐瑶陈建兵
Owner CHINA PETROLEUM & CHEM CORP
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