Gas-phase oxidative cracking of ethane in a nitrogen atmosphere

Effect of oxygen concentration on the oxidative conversion of propane

“…RESULTS AND DISCUSSION Despite significant differences in the experimental procedure, the results correspond well to those obtained under almost identical conditions (tempera ture, pressure, and residence time of reagents in the reactor) reported in [10][11][12][13]; this is the consequence of the gas phase character of the process, which is mainly determined by its macrokinetic parameters. In both series of studies, the propane conversion strongly increased with the oxygen concentration.…”

“…In both series of studies, the propane conversion strongly increased with the oxygen concentration. The compo sition of the products is also the same, not only quali tatively, but also quantitatively, despite the lower initial [C 3 H 8 ]/[O 2 ] ratio in [10][11][12][13]. The significant increase in temperature led to a decrease in the propylene con centration in both series, while the ethylene concen tration remained the same and even slightly increased (Fig.…”

“…As shown in [10][11][12][13], in the presence of oxygen under certain conditions, the process occurs by the branched chain mechanism, which dramatically increases the concentration of chain carriers (active radicals) and, accordingly, the propane conversion. These results confirm the significant difference between the mechanisms of homogeneous and heter ogeneous oxidative conversion of propane [11] and prospects for gas phase oxidation of light alkanes as a method for the production of olefins and as a method for selective purification of hydrocarbon gases from heavy hydrocarbon impurities [12].…”

“…Thus, at 43% propane conversion, the selectivity of its conversion into propylene reached 38 mol %, and the total selectivity of the formation of propylene and ethylene was 75 mol % [9]. In recent studies on the oxidative conversion of light alkanes С 2 -С 5 , including in the presence of a large excess of methane [10][11][12][13] under slightly different experimen tal conditions, the results were generally in good agreement with the results of [6,8,9].…”

Partial Oxidation of Light Alkanes as a Base of New Generation of Gas Chemical Processes

“…Moreover, the methane content even increases, since it is one of the main products of oxycracking of its heavier homologues [11,14,20]. The main products of the oxycracking of methane homologues are ethylene, methane, ethane, hydrogen, and carbon monoxide, with ethane and propylene being present in small amounts [17,[20][21][22]. The presence of a heterogeneous catalyst significantly accelerates the process at low temperatures, but impedes it at higher temperatures, at which an abrupt transition to the branched-chain-reaction mode occurs.…”