Furfural production from microwave catalytic torrefaction of Douglas fir sawdust

Shoujie Ren, Hanwu Lei, Yayun Zhang, Lu Wang, Quan Bu, Yi Wei, R. R Ruan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The torrefaction bio-oil is composed of a number of chemical compounds with low concentrations, which results in a low efficiency of its application. To improve the concentrations of high-value chemicals such as furfural in the torrefaction bio-oil, four metal chlorides and hydrochloric acid were investigated as catalysts in the torrefaction of Douglas fir by microwave heating. The number of chemical compounds in the attained bio-oil was significantly reduced with introducing MgCl 2 , FeCl 3 , and AlCl 3 being into the process of torrefaction. The bio-oil obtained with these three catalysts were dominated by furfural with the concentration over 20 mg/g with the torrefaction temperature, time, and catalyst/reactant ratio of 250 °C, 10 min, and 8 wt.%, respectively. The effects of torrefaction conditions on product yield were investigated by selecting MgCl 2 as the catalyst, and the results indicated that the yield of torrefied biomass decreased significantly with the increase of reaction temperature, time, and catalyst loading while the yield of bio-oil collected simultaneously was increased. Further analysis for the bio-oil suggested that low temperature, long reaction time, and high catalyst loading favored furfural production. The analysis for non-condensable gas suggested that high reaction temperature and catalyst loading promoted the methane and carbon monoxide production during torrefaction. According to bio-oil and non-condensable gas analysis, a reaction pathway was proposed to explain biomass catalytic torrefaction using MgCl 2 .

Original languageEnglish (US)
Pages (from-to)188-195
Number of pages8
JournalJournal of Analytical and Applied Pyrolysis
Volume138
DOIs
StatePublished - Mar 1 2019

Fingerprint

Furaldehyde
Furfural
Sawdust
Oils
Microwaves
Catalysts
Chemical compounds
Biomass
Temperature
Gas fuel analysis
Microwave heating
Hydrochloric Acid
Methane
Hydrochloric acid
Carbon Monoxide
Carbon monoxide
Chlorides
Gases
Metals

Keywords

  • Catalytic torrefaction
  • Furfural
  • Metal chloride
  • Microwave

Cite this

Furfural production from microwave catalytic torrefaction of Douglas fir sawdust. / Ren, Shoujie; Lei, Hanwu; Zhang, Yayun; Wang, Lu; Bu, Quan; Wei, Yi; Ruan, R. R.

In: Journal of Analytical and Applied Pyrolysis, Vol. 138, 01.03.2019, p. 188-195.

Research output: Contribution to journalArticle

Ren, Shoujie ; Lei, Hanwu ; Zhang, Yayun ; Wang, Lu ; Bu, Quan ; Wei, Yi ; Ruan, R. R. / Furfural production from microwave catalytic torrefaction of Douglas fir sawdust. In: Journal of Analytical and Applied Pyrolysis. 2019 ; Vol. 138. pp. 188-195.
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abstract = "The torrefaction bio-oil is composed of a number of chemical compounds with low concentrations, which results in a low efficiency of its application. To improve the concentrations of high-value chemicals such as furfural in the torrefaction bio-oil, four metal chlorides and hydrochloric acid were investigated as catalysts in the torrefaction of Douglas fir by microwave heating. The number of chemical compounds in the attained bio-oil was significantly reduced with introducing MgCl 2 , FeCl 3 , and AlCl 3 being into the process of torrefaction. The bio-oil obtained with these three catalysts were dominated by furfural with the concentration over 20 mg/g with the torrefaction temperature, time, and catalyst/reactant ratio of 250 °C, 10 min, and 8 wt.{\%}, respectively. The effects of torrefaction conditions on product yield were investigated by selecting MgCl 2 as the catalyst, and the results indicated that the yield of torrefied biomass decreased significantly with the increase of reaction temperature, time, and catalyst loading while the yield of bio-oil collected simultaneously was increased. Further analysis for the bio-oil suggested that low temperature, long reaction time, and high catalyst loading favored furfural production. The analysis for non-condensable gas suggested that high reaction temperature and catalyst loading promoted the methane and carbon monoxide production during torrefaction. According to bio-oil and non-condensable gas analysis, a reaction pathway was proposed to explain biomass catalytic torrefaction using MgCl 2 .",
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AB - The torrefaction bio-oil is composed of a number of chemical compounds with low concentrations, which results in a low efficiency of its application. To improve the concentrations of high-value chemicals such as furfural in the torrefaction bio-oil, four metal chlorides and hydrochloric acid were investigated as catalysts in the torrefaction of Douglas fir by microwave heating. The number of chemical compounds in the attained bio-oil was significantly reduced with introducing MgCl 2 , FeCl 3 , and AlCl 3 being into the process of torrefaction. The bio-oil obtained with these three catalysts were dominated by furfural with the concentration over 20 mg/g with the torrefaction temperature, time, and catalyst/reactant ratio of 250 °C, 10 min, and 8 wt.%, respectively. The effects of torrefaction conditions on product yield were investigated by selecting MgCl 2 as the catalyst, and the results indicated that the yield of torrefied biomass decreased significantly with the increase of reaction temperature, time, and catalyst loading while the yield of bio-oil collected simultaneously was increased. Further analysis for the bio-oil suggested that low temperature, long reaction time, and high catalyst loading favored furfural production. The analysis for non-condensable gas suggested that high reaction temperature and catalyst loading promoted the methane and carbon monoxide production during torrefaction. According to bio-oil and non-condensable gas analysis, a reaction pathway was proposed to explain biomass catalytic torrefaction using MgCl 2 .

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