Flash pyrolysis of brown coal modified by alcohol-vapor explosion treatment

Jun Ichiro Hayashi, Takao Mori, Shinobu Amamoto, Katsuki Kusakabe, Shigeharu Morooka

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


Morwell brown coal was swollen in a pressurized vapor of methanol, ethanol, propanols, and butanols at 260 and 280 °C. The pressure was then explosively released, and the coal was rapidly quenched. FT-IR spectra and elemental analyses of treated coals revealed that alcohols were chemically incorporated into the coal mainly in the form of aryl alkyl ethers and that a part of hydrogen bonds of the coal were irreversibly disrupted. The effect of explosion on thermal degradability of the coal was examined from the distribution of pyrolysates obtained by flash pyrolysis at 764 °C. Explosion with methanol and 2-propanol increased the tar yield to 31 and 33 kg per 100 kg of original coal, respectively, from 17 kg of the original coal. The tar yields were equivalent to Chose from coals modified by base-catalyzed O-methylation and O-isopropylation. Swelling in alcohol vapor, instantaneous pressure release, and rapid quenching were essential for the enhancement.

Original languageEnglish
Pages (from-to)1099-1107
Number of pages9
JournalEnergy and Fuels
Issue number5
Publication statusPublished - 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology


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