ChemInform Abstract: THERMAL DECOMPOSITION OF PROPIONALDEHYDE IN THE PRESENCE OF ETHYLENE LABELLED WITH (14)C PART 1, FORMATION MECHANISM OF LABELLED ETHANE PART 2, OLIGOMERIZATION OF ETHYLENE AS A SOURCE OF THE SECONDARY PRODUCTS

Acs, G.; Tóth, Gábor; Hühn, Peter

doi:10.1002/chin.197451147

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“…The same authors extended their experiments to determine the effect of added ethylene and propylene on the pyrolysis process. [13][14][15][16] The products observed in these experiments were largely the same as those observed in their experiments on pure propionaldehyde, with C 2 H 6 and CO as the major products. Radical intermediates, particularly ethyl, are suspected to play a key role in the mechanism of propionaldehyde decomposition.…”

Section: Introductionsupporting

confidence: 61%

Products From Pyrolysis of Gas-Phase Propionaldehyde

et al. 2014

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A hyperthermal nozzle was utilized to study the thermal decomposition of propionaldehyde, CH3CH2CHO, over a temperature range of 1073-1600 K. Products were identified with two detection methods: matrix-isolation Fourier transform infrared spectroscopy and photoionization mass spectrometry. Evidence was observed for four reactions during the breakdown of propionaldehyde: α-C-C bond scission yielding CH3CH2, CO, and H, an elimination reaction forming methylketene and H2, an isomerization pathway leading to propyne via the elimination of H2O, and a β-C-C bond scission channel forming methyl radical and (•)CH2CHO. The products identified during this experiment were CO, HCO, CH3CH2, CH3CH═C═O, H2O, CH3C≡CH, CH3, H2C═C═O, CH2CH2, CH3CH═CH2, HC≡CH, CH2CCH, H2CO, C4H2, C4H4, and CH3CHO. The first eight products result from primary or bimolecular reactions involving propionaldehyde while the remaining products occur from reactions including the initial pyrolysis products. While the pyrolysis of propionaldehyde involves reactions similar to those observed for acetaldehyde and butyraldehyde in recent studies, there are a few unique products observed which highlight the need for further study of the pyrolysis mechanism.

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Section: Introductionsupporting

confidence: 61%