1 research outputs found
Experimental Study of Tetrahydrofuran Oxidation and Ignition in Low-Temperature Conditions
The
chemistry associated with low-temperature oxidation and ignition
of tetrahydrofuran (THF) has been probed through experimental work
in two distinct devices: a rapid compression machine (RCM) and a jet-stirred
reactor (JSR). Ignition delays of stoichiometric THF/O<sub>2</sub>/inert mixtures have been measured for pressures ranging from 0.5
to 1.0 MPa and core gas temperatures from 640 to 900 K. Two-stage
ignition is visible up to 810 K, and the evolution of the ignition
delay with the temperature shows a clear deviation from Arrhenius
behavior between 680 and 750 K. Sampling of the reactive mixture during
the ignition delay provided evidence of the formation of C<sub>1</sub>–C<sub>4</sub> aldehydes and alkenes, a variety of oxygenated
heterocycles, including oxirane, methyloxirane, oxetane, furan, both
isomers of dihydrofuran, and 1,4-dioxene, as well as cyclopropanecarboxaldehyde
and formic acid-2-propenyl ester. JSR experiments have been performed
under pressure close to 1 atm, at temperatures from 500 to 1000 K,
and at equivalence ratios from 0.5 to 2, with detailed analysis of
the low-temperature intermediate products. Major products include
carbon monoxide, carbon dioxide, C<sub>1</sub>–C<sub>2</sub> hydrocarbons, and aldehydes, 1-butene, ethylene oxide, methylvinylether,
acrolein, propanal, both isomers of dihydrofuran, furan, 2-butenal,
cyclopropanecarboxaldehyde, 1,4-dioxene, and unsaturated dihydrofuranols.
The obtained mole fraction profiles indicate a significant low-temperature
reactivity of THF beginning at temperatures around 550 K, with a marked
negative temperature coefficient zone. The results from both experimental
devices are put in perspective and allow for the identification of
the major formation pathways of the observed species