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Method for preparing furfural from fiber pentosan hydrolysate by using composite solid acid as catalyst

A technology for pentosan water and furfural, which is applied in the field of preparing furfural by using composite solid acid catalyzed cellulose pentosan hydrolyzate, and achieves the effects of good effect, high catalytic activity, and efficient utilization of biomass.

Inactive Publication Date: 2012-02-01
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the first step, due to the use of ultra-low acid steam explosion pretreatment or hemicellulase-catalyzed hydrolysis, not only the problems of acid corrosion and environmental pollution can be overcome, but also the fiber produced in the obtained pentosan hydrolyzate due to severe conditions Less degradation products and other by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Take 50g of corn stalks crushed to a size of about 5mm, put them in a 1L reaction bottle, add pH5.0 citric acid-disodium hydrogen phosphate buffer solution according to the liquid-solid ratio of 9:1, and add 100U per gram of raw materials after sterilization The mixture of homemade xylanase and xylosidase was reacted in a constant temperature biological incubator at 50°C for 48 hours by shaking the flask, and the pentosan hydrolyzate with a reducing sugar content of 6.5% was obtained after filtration and deproteinization of the filtrate. Take 100mL of the pentosan hydrolyzate, put it in a 1L reaction kettle, add 2% solid superacid SO2 which is roasted at 550°C and has a Ti / Zr ratio of 1:1. 4 2- / TiO 2 -ZrO 2 , reacted at 140°C for 2 hours, filtered to recover the solid acid catalyst, and the filtrate was distilled under reduced pressure to obtain the furfural product. The furfural content was analyzed and the yield of furfural was calculated to be 6.9% (relative to the...

Embodiment 2

[0026] Get 100mL of the pentosan hydrolyzate obtained in Example 1, place it in a 1L reactor, add 2% solid superacid SO2 which is roasted at 1000°C, and the Ti / Zr ratio is 1:1. 4 2- / TiO 2 -ZrO 2 , reacted at 130°C for 2 hours, filtered and recovered the solid acid catalyst, and the filtrate was distilled under reduced pressure to obtain the furfural product. The furfural yield was calculated to be 7.2% (relative to the corn stalk raw material) by analyzing the furfural content.

Embodiment 3

[0028] Take 50g of poplar sawdust from a poplar wood processing plant, put it in a 1L reaction bottle, add pH5.0 citric acid-disodium hydrogen phosphate buffer solution according to the liquid-solid ratio of 9:1, and measure it at 150U per gram of raw material after sterilization Add the homemade mixture of xylanase and xylosidase, shake the flask in a constant temperature biological incubator at 50°C for 48 hours, and filter and deproteinize the filtrate to obtain a pentosan hydrolyzate with a reducing sugar content of 5.8%. Take 100mL of the pentosan hydrolyzate, put it in a 1L reaction kettle, add 2% solid superacid SO2 which is roasted at 550°C and has a Ti / Zr ratio of 1:1. 4 2- / TiO 2 -ZrO 2 , reacted at 140°C for 2 hours, filtered to recover the solid acid catalyst, and the filtrate was distilled under reduced pressure to obtain the furfural product. The furfural content was analyzed and the yield of furfural was calculated to be 6.2% (relative to the raw material of p...

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Abstract

The invention discloses a novel method for preparing furfural from fiber pentosan hydrolysate by using binary composite solid acid as a catalyst. The method comprises the following steps: proportionally mixing hydroxides generated by hydrolyzing two different metal salts, impregnating and roasting to obtain binary composite solid acid (titanium-zirconium composite solid acid); and directly preparing the biomass chemical furfural from fiber pentosan hydrolysate by using the binary composite solid acid as the solid catalyst. The method widens the adaptability of raw materials required by preparing furfural, and avoids the problems of acid corrosion and environmental pollution in the furfural production process; the catalyst can be easily recycled and reused; and thus, the invention can implement clean production of furfural. The raw material used in the invention can be a pentaose solution, dilute acid hydrolysate of fibers, or pentosan hydrolysate which is obtained by treating fibers with steam explosion or hemicellulase in the cellulose ethanol fuel production process.

Description

technical field [0001] The invention belongs to the technical field of chemical processing of forestry products and the technical field of biomass chemical preparation, and relates to a new method for preparing furfural from fiber raw materials, in particular to a method using agricultural and forestry plants and their processing residues as raw materials, using ultra-low acid steam explosion or semi The hydrolyzate of pentosan is obtained by cellulase treatment, and then the method of preparing furfural is prepared from the hydrolyzate of pentosan by catalyzing the plant material pentosan hydrolyzate by using binary compound solid acid as a catalyst. The furfural raw material prepared by the invention has wide adaptability, and the preparation method is clean and efficient. Background technique [0002] Biomass resources, mainly agricultural and forestry plant resources, are used as raw materials to process biomass energy, biomass chemicals, and biomass materials through ch...

Claims

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Application Information

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IPC IPC(8): C07D307/50C12P17/04
CPCY02P20/584
Inventor 王飞李迅赵林果钱方军
Owner NANJING FORESTRY UNIV
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