A comprehensive chemical kinetic combustion model for the four butanol isomers

Subram Sarathy*, Stijn Vranckx, Kenji Yasunaga, Marco Mehl, Patrick Oßwald, Wayne K. Metcalfe, Charles K. Westbrook, William J. Pitz, Katharina Kohse-Höinghaus, Ravi X. Fernandes, Henry J. Curran

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

406 Scopus citations

Abstract

Alcohols, such as butanol, are a class of molecules that have been proposed as a bio-derived alternative or blending agent for conventional petroleum derived fuels. The structural isomer in traditional " bio-butanol" fuel is 1-butanol, but newer conversion technologies produce iso-butanol and 2-butanol as fuels. Biological pathways to higher molecular weight alcohols have also been identified. In order to better understand the combustion chemistry of linear and branched alcohols, this study presents a comprehensive chemical kinetic model for all the four isomers of butanol (e.g., 1-, 2-, iso- and tert-butanol). The proposed model includes detailed high-temperature and low-temperature reaction pathways with reaction rates assigned to describe the unique oxidation features of linear and branched alcohols. Experimental validation targets for the model include low pressure premixed flat flame species profiles obtained using molecular beam mass spectrometry (MBMS), premixed laminar flame velocity, rapid compression machine and shock tube ignition delay, and jet-stirred reactor species profiles. The agreement with these various data sets spanning a wide range of temperatures and pressures is reasonably good. The validated chemical kinetic model is used to elucidate the dominant reaction pathways at the various pressures and temperatures studied. At low-temperature conditions, the reaction of 1-hydroxybutyl with O 2 was important in controlling the reactivity of the system, and for correctly predicting C 4 aldehyde profiles in low pressure premixed flames and jet-stirred reactors. Enol-keto isomerization reactions assisted by radicals and formic acid were also found to be important in converting enols to aldehydes and ketones under certain conditions. Structural features of the four different butanol isomers leading to differences in the combustion properties of each isomer are thoroughly discussed.

Original languageEnglish (US)
Pages (from-to)2028-2055
Number of pages28
JournalCombustion and Flame
Volume159
Issue number6
DOIs
StatePublished - Jun 1 2012

Keywords

  • Alcohol combustion
  • Bio-butanol
  • Butanol isomers
  • Chemical kinetic modeling
  • Reaction rate rules

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Physics and Astronomy(all)

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