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Method for making furfuraldehyde using xylose mother liquor as material

A technology of xylose mother liquor and furfural, which is applied in the direction of organic chemistry, can solve the problems of inability to extract and recover xylose and large economic losses, and achieve the effect of high furfural yield and simple process

Inactive Publication Date: 2006-04-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, manufacturers cannot extract and recycle xylose in the xylose mother liquor, and sell the mother liquor directly, which brings great economic losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Get xylose mother liquor (mass content is 51% xylose, 18% arabinose, 7% galactose, 15% glucose, 1% mannose, 1% miscellaneous sugar, all the other are water) 160g, water 1000g, 60g of acetic acid, and 80g of sodium chloride were added to the dehydration kettle. The reaction temperature is 180°C and the pressure is 0.9Mpa. The aldehyde-water mixed vapor is exported through the gas phase valve, condensed by the condenser, and collected in the receiving bottle. Adjust the gas phase valve opening, control the steaming speed, and react until the xylose in the mother liquor is completely converted. After distilling off the water from the obtained aldehyde-water mixture, 37 g of furfural was obtained, and the yield of converting xylose into furfural reached 70% of the theoretical value.

Embodiment 2

[0012] Get xylose mother liquor (mass content is 51% xylose, 18% arabinose, 7% galactose, 15% glucose, 1% mannose, 1% miscellaneous sugar, all the other are water) 160g, water 1000g and 30g of acetic acid are added to the dehydration kettle. The reaction temperature is 220°C and the pressure is 2.5 MPa. The mixed vapor of aldehyde and water is exported through the gas phase valve, condensed by the condenser, and collected in the receiving bottle. Adjust the gas phase valve opening, control the steaming speed, and react until the xylose in the mother liquor is completely converted. The obtained aldehyde-water mixture was distilled to obtain 42.3 g of furfural, and the yield of converting xylose into furfural reached 81% of the theoretical value.

Embodiment 3

[0014] Get xylose mother liquor (mass content is 51% xylose, 18% arabinose, 7% galactose, 15% glucose, 1% mannose, 1% miscellaneous sugar, all the other are water) 500g, water 1000g, 30g of sulfuric acid and 60g of sodium sulfate are added to the dehydration kettle. The reaction temperature is 160°C and the pressure is 0.53 MPa. The mixed vapor of aldehyde and water is exported through the gas phase valve, condensed by the condenser, and collected in the receiving bottle. Adjust the gas phase valve opening, control the steaming speed, and react until the xylose in the mother liquor is completely converted. After distilling off the water from the obtained aldehyde-water mixture, 107.7 g of furfural was obtained, and the yield of converting xylose into furfural could reach 66% of the theoretical value.

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PUM

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Abstract

The present invention belongs to the field of furfural preparing technology. The process of preparing furfural from xylose mother liquid as material includes adopting titania acidified with acetic acid, phosphoric acid, sulfuric acid or hydrochloric acid or zirconia acidified with sulfuric acid as catalyst, adopting sodium chloride, potassium chloride, zinc chloride, multiple superphosphate, sodium sulfate, potassium sulfate or sodium acetate as co-catalyst, adding xylose mother liquid, water, catalyst and co-catalyst in certain weight proportion inside dewatering reactor, reacting at 120-260 deg.c and 0.1-5.0 MPa, condensing produced vapor to obtain water solution of furfural, and evaporating water to obtain furfural. The present invention has the advantages of simple technological process and high furfural yield.

Description

technical field [0001] The invention relates to a method for preparing furfural by using xylose mother liquor as a raw material, which belongs to the preparation technology of furfural. Background technique [0002] The chemical name of furfural is furan formaldehyde, which is mainly used as the raw material for the production of furan derivatives, the refining of lubricating oil in petroleum refining, the selective solvent for separating unsaturated aliphatic compounds from saturated aliphatic compounds, etc. So far, it can only be obtained by hydrolyzing plant fibers. Pentosan in plant fiber is first hydrolyzed into xylose in acidic solution, and then xylose is dehydrated and cyclized to furfural. The industrial production of furfural usually adopts a one-step method, that is, the hydrolysis and dehydration reactions are carried out in the same reaction pot, and the yield of furfural only reaches about 50% of the theoretical value, and a lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48
Inventor 李凭力肖文平解利昕常贺英李加波王世昌
Owner TIANJIN UNIV
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