Recycling of product gas does not affect fast pyrolysis oil yield and composition

Mehmet Pala, Pushkar S. Marathe, Xun Hu, Frederik Ronsse, Wolter Prins, Sascha R.A. Kersten, Jean Paul Lange, Roel J.M. Westerhof*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

It has been reported that a deoxygenated bio-oil (ca. 0.12 kg kg−1 O on bio-oil basis) can be obtained simply by recycling the non-condensable gases (NCG) of biomass fast pyrolysis to a fluidized-bed reactor operated at atmospheric pressure [Mullen et al., 2013, Energy Fuels, 27, 3867–3874]. Such an unprecedented effect would (i) complicate the use of lab-scale research results obtained typically under inert gas (N2, He, Ar) atmosphere for the design of commercial scale pyrolysis units projected to utilize a recycle gas atmosphere (ii) obviate the need for catalytic pyrolysis or mild hydrotreatment processes. Considering these implications, further validation or refutation of the claimed deoxygenation effect of recycle gas atmosphere is needed. Therefore, fast pyrolysis experiments with pine wood were performed in a bench-scale fluidized bed reactor under N2 atmosphere, recycle gas atmospheres (75 % and 90 % recycle gas volume fraction) at reactor temperatures of 430 °C and 500 °C. Mass balances were obtained and the bio-oils were analyzed using GC/MS, GPC, elemental analysis and Karl Fischer titration. No significant differences were observed in product yield and bio-oil composition (e.g. oxygen content) when going from a nitrogen gas atmosphere to a recycle gas atmosphere for both pyrolysis temperatures.

Original languageEnglish
Article number104794
JournalJournal of analytical and applied pyrolysis
Volume148
Early online date11 Feb 2020
DOIs
Publication statusPublished - Jun 2020

Keywords

  • UT-Hybrid-D
  • Biomass
  • Fast pyrolysis
  • Gas recycling
  • Reaction atmosphere
  • Bio-oil

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