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Method for preparing furfural through steam-assisted fixed bed pyrolysis of wood fiber biomass

A technology for lignocellulosic and biomass, which is applied in the field of steam-assisted fixed bed pyrolysis of lignocellulosic biomass to prepare furfural, can solve the problems of difficult recovery of catalysts, difficult to realize industrialization, poor stability of catalysts, etc., so as to avoid corrosion of catalysts and equipment, improve Process safety, achieving continuous effects

Pending Publication Date: 2019-11-22
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved: How to solve the problems of high energy consumption, serious environmental pollution, high production cost and low yield of the target product in the current industrial production process of furfural, as well as the poor stability of solid acid catalyst and the use of a large amount of organic solvents in the solvent liquefaction process. High economic cost, difficult to achieve industrialization, etc., and the use of liquid acid as a catalyst in the process of furfural industrialization causes corrosion of equipment, difficult recovery of catalysts, etc.

Method used

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  • Method for preparing furfural through steam-assisted fixed bed pyrolysis of wood fiber biomass
  • Method for preparing furfural through steam-assisted fixed bed pyrolysis of wood fiber biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 20 g of crushed corncobs, 150 g of water and 5 mmol of H 2 SO 4 Add to the beaker, stir and dry; the loaded H 2 SO 4 Add corncobs into the fixed-bed reactor; then add deionized water to the steam generating device, and raise the temperature to 150°C; raise the temperature of the fixed-bed reactor to 230°C; open the outlet valve of the steam generating device, and adjust the steam flow rate. Higher than 5g / min; steam passes through the fixed bed reactor bed from bottom to top; the continuous pyrolysis and extraction time is 2h, the pyrolysis product is removed from the fixed bed reactor, and finally the steam is condensed to obtain furfural-rich The aqueous phase was finally extracted with ethyl acetate to obtain the furfural product. The product yield is shown in Table 1, and the furfural product yield was 8.1 wt%.

Embodiment 2

[0033] Weigh 20 g of crushed corncobs, 150 g of water and 5 mmol of AlCl 3 Add to the beaker, stir and dry; the loaded AlCl 3 Add corncobs into the fixed-bed reactor; then add deionized water to the steam generating device, and raise the temperature to 150°C; raise the temperature of the fixed-bed reactor to 230°C; open the outlet valve of the steam generating device, and adjust the steam flow rate. Higher than 5g / min; steam passes through the fixed bed reactor bed from bottom to top; the continuous pyrolysis and extraction time is 2h, the pyrolysis product is removed from the fixed bed reactor, and finally the steam is condensed to obtain furfural-rich The aqueous phase, and finally extract the furfural product through ethyl acetate extraction, the product yield is shown in Table 1, and the furfural product yield is 10.5wt%.

Embodiment 3

[0035] Weigh 20g of crushed corn cob, 150g of water and 5mmol of Al 2 (SO 4 ) 3 Add to the beaker, stir and dry; the loaded Al 2 (SO 4 ) 3Add corncobs into the fixed-bed reactor; then add deionized water to the steam generating device, and raise the temperature to 150°C; raise the temperature of the fixed-bed reactor to 230°C; open the outlet valve of the steam generating device, and adjust the steam flow rate. Higher than 10g / min; the steam passes through the bed of the fixed bed reactor from bottom to top, and the pyrolysis products are removed from the fixed bed reactor, and finally the steam is condensed to obtain a furfural-rich aqueous phase, which is finally extracted with ethyl acetate The furfural product was obtained, and the yield of the product was shown in Table 1. The yield of the furfural product was 15.7 wt%. The time for continuous pyrolysis and extraction was 2 hours. The furfural product obtained by ethyl acetate extraction was analyzed by GC-MS total i...

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Abstract

The invention discloses a method for preparing furfural through steam-assisted fixed bed pyrolysis of wood fiber biomass, and belongs to the technical field of biomass resource utilization. The methodincludes: carrying out pyrolysis on the wood fiber biomass loaded with the catalyst in a fixed bed reactor to obtain a pyrolysis product; with saturated steam as an extraction solvent, performing continuosu removal on the pyrolysis product to prepare furfural; wherein the catalyst is any one of H2SO4, H3PO4, SnCl4, CrCl3, InCl3, AlCl3, Al2(SO4)3, Fe2(SO4)3, CuSO4 or ZnCl2, the pyrolysis temperature is 100-400 DEG C, the steam temperature is 100-300 DEG C, the steam flow is 2.5-15 g / min, and the reaction time is 0.5-3 h. According to the method, catalytic pyrolysis conversion of the lignocellulosic biomass hemicellulose component is achieved through pyrolysis, continuous furfural removal is achieved through saturated steam extraction, and the furfural yield is increased.

Description

technical field [0001] The invention belongs to the technical field of utilization of biomass resources, and in particular relates to a method for preparing furfural by steam-assisted fixed-bed pyrolysis of lignocellulosic biomass. Background technique [0002] A series of problems such as energy depletion caused by the extensive use of fossil fuels, global warming and environmental pollution have seriously restricted the sustainable development of the current social economy. Therefore, the search for renewable, environmentally friendly and clean energy has received widespread attention. Biomass is the only renewable resource that can be stored, and its utilization can achieve CO 2 zero emission. The use of renewable lignocellulosic resources to prepare high-value chemicals and realize the efficient utilization of lignocellulosic fibers is of great significance to alleviate the current social environment and economic pressure. [0003] Furfural, currently the only chemica...

Claims

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Application Information

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IPC IPC(8): C07D307/50
CPCC07D307/50
Inventor 叶俊蒋剑春徐俊明王奎李静周铭昊赵佳平刘朋夏海虹王瑞珍
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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