Pyrolysis of lignite with internal recycling and conversion of oil

Yong Huang, Hajime Sakamoto, Shinji Kudo, Koyo Norinaga, Jun Ichiro Hayashi

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13 Citations (Scopus)


The present authors studied pyrolysis of lignite with internal recycling of a heavier portion of the liquid product (oil), employing a reactor that experimentally simulated continuous pyrolysis in a gas-solid countercurrent moving-bed reactor. The lignite particles traveled through the isothermal section at the temperature (Tiso) of 140 or 180 °C and then the non-isothermal section from Tiso to the peak pyrolysis temperature (Tp) of 600 °C. Among the volatile products, a lighter portion of the oil (LO) with a normal boiling point of <360 °C was allowed to escape from the reactor together with steam and non-condensable gas, while the heavier portion of the oil was sorbed by the moving particles in both sections, recycled to the pyrolysis and then converted into char, water, and non-condensable gases inside the reactor. The oil recycling increased the char yield by up to 6 wt % dry lignite. LO consisted mainly of alkanes/alkenes (37-49 wt %), lower oxygenates (acids, ketones, esters, and ethers; 17 wt %), phenols (6-26 wt %), and monoaromatic hydrocarbons (12-21 wt %), but it contained no triaromatics. LO was evaporated completely upon heating to 200 °C, leaving no residue. Tiso influenced the composition of LO. The heaviest compounds varied from C17 to C21 paraffins for Tiso of 140-180 °C, respectively.

Original languageEnglish
Pages (from-to)7285-7293
Number of pages9
JournalEnergy and Fuels
Issue number11
Publication statusPublished - Nov 20 2014

All Science Journal Classification (ASJC) codes

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


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