Oxidative Pyrolysis of Propane

Abstract

Literature on the oxidative pyrolysis of propane is very sparse for temperatures above 600 OC. Hence the present work was carried out between 600 and 700 OC at 1 atm total pressure using a plug flow quartz reactor and the MS10-C2 mass spectrometer as the analytical tool. Small amounts of oxygen were added into the propane stream such that the oxygen can only participate in the early stages of reaction, thus throwing some light on the nature of the initiation reactions in pyrolysis and oxidation systems. Results were compared with computer predictions. The following observations were made: (1) a faster rate of decomposition of propane in the presence of oxygen than in its absence; (2) a product distribution (at the initial stages) in order of magnitude C3H8, C2H4, CH,, H, , and C2Hs as compared to the order CH, , C2H4, C3H6, H, , and C2H6 in the absence of oxygen; (3) the mechanism reported in the literature for temperatures between 500 and 600 "C is also operative at higher temperatures; (4) a 28 reaction step model fits the experimental data. The role of H 0 2 in relation to the observed product spectrum is also fully discussed

Kinetic modelling of the gas phase ethane and propane oxidative dehydrogenation

“…It was assumed that reactions are elementary and the rate coefficients obey the Arrhenius relationship. The kinetic parameters of the elementary reactions were adopted from literature [9][10][11][12][13][14][15]. For a limited number of reactions the frequency factor has been varied by AE10% in order to fit the experimental data.…”

“…The structure of the model for the gas phase propane oxidative dehydrogenation was based on several studies about propane pyrolysis and oxidative dehydrogenation [9,12,14,15]. As in the case of ethane ODH, the propane ODH model includes the same categories of reactions (initiation, hydrogen atom abstraction, addition, decomposition reactions, etc.).…”

“…In Table 2, the Table 2 Elementary reactions and kinetic data for propane gas phase ODH [9,12,14,15] Reactions log k 0 (s À1 or cm mol À1 s À1 ) E (kJ/mol) reactions and their kinetic data are presented. As with ethane initiation reactions, the contribution of the oxidative route in this step is quite important as depicted from the significantly lower activation energy of reactions (2) and (3) compared to the pyrolysis route (1).…”

Evaluation of cashew apple juice for single cell protein and wine production

“…Therefore, the development of single cell protein on an industrial scale to combat the sweeping starvation and malnutrition facing many developing countries should be a welcome idea. Industrially, the palmwine yeasts have been used in ethanol production [3], wine production [4], single cell protein [5]. In generating single cell protein from yeast, many substrates with various modifications have been used for example single cell protein has been generated on hydrocarbon feed-stock [5], potato processing waste water [6] and cheese whey [7].…”

An overall and detailed kinetic study of the pyrolysis of propane

“…Unfortunately the data used to verify the above mechanisms were obtained from very low conversion pyrolysis experiments and covered a very narrow range of temperatures and pressures. Three additional mechanisms have appeared in the literature [13,21,22], but the specific rate constants used in these investigations are not representative of those reported elsewhere.…”