Effects of the gas medium and heterogeneous factors on the gas-phase oxidative cracking of ethane

Magomedov, R. N.; Proshina, A. Yu.; Peshnev, B. V.; Arutyunov, V. S.

doi:10.1134/s0023158413040125

Cited by 18 publications

(11 citation statements)

References 13 publications

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“…The conversion of propane rapidly increased at elevated temperatures. At temperatures above 650°C at which the process became substantially gas phase [11], the yield of ethylene increased monotonically with tem perature (table) and the yield of propylene passed through a weak maximum at ~650°C and then abruptly decreased. As a result, the total yield of ethyl ene and propylene decreased at elevated temperatures.…”

Section: Results Of Experimentsmentioning

confidence: 97%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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Effect of oxygen concentration on the oxidative conversion of propane

Pogosyan

Arsentiev

et al. 2015

Russ. J. Phys. Chem. B

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The influence of the initial concentration of oxygen and temperature on the oxidative conversion of propane in a two sectional flow reactor at constant pressure and contact time was studied. It was shown that an increase in the initial concentration of oxygen not only increases the conversion of propane, but also affects the ratio of the reaction products. The yield of ethylene and propylene was found to depend on the initial propane to oxygen ratio and reaction temperature.

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Section: Results Of Experimentsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Effect of oxygen concentration on the oxidative conversion of propane

Pogosyan

Arsentiev

et al. 2015

Russ. J. Phys. Chem. B

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“…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.…”

Section: Selective Oxycracking Of Heavier Components Of Natural Gasmentioning

confidence: 99%

“…The reactor surface acts in a similar manner, apparently due to the heterogeneous termination of chains. In addition, the presence of a catalyst greatly increases the formation of CO 2 and H 2 O because of the deep oxidation of hydrocarbons on the catalyst surface [22]. Therefore, at these conditions, the gas-phase process is preferable.…”

Section: Selective Oxycracking Of Heavier Components Of Natural Gasmentioning

confidence: 99%

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

2013

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Recent developments in unconventional natural gas production increase the need for principally new small-scale technologies for gas processing and transportation. The promising way for small-scale gas processing is its autothermal partial oxidation to syngas or direct partial oxidation to chemicals. The paper considers some prospective gas chemical processes based on the partial oxidation of light alkanes. Among them are the conversion of natural gas to syngas in volumetric (3D) matrix burners made of a gas permeable material and direct conversion of methane to methanol without its preliminary conversion to syngas (DMTM). As a more simple technology that lets to use fat associated oil gas often flaring in remote sites, it can be suggested the selective oxidative cracking of heavier components of natural gas. This process converts heavy methane homologues from propane to pentane and heavier into ethylene, methane, ethane, hydrogen, and carbon monoxide, thus increasing methane index (octane number) of gas and making it suitable for feeding modern gas piston and gas turbine power engines. One more interesting prospect is the creation of technologies making use of the subsequent processing of valuable oxycracking products, such as olefins, CO, and hydrogen, for example, by their catalytic co-polymerization without preliminary separation from gas phase. The co-polymerization of CO and ethylene, followed by the separation of resulting liquid products, can considerably improve the economic attractiveness of the oxycracing process. Thus, despite the absence of economically proved and industrial-scale tested smallcapacity direct and indirect gas chemical technologies, intensive efforts to develop such alternative technologies let to expect near bright future for them.

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“…A noticeable effect of methane on the oxidation of its heavier homologues at temperatures at which the oxidation of methane itself does not yet occur was reported in [6,7]. It is of great interest for the pro cesses of refining complex mixtures of natural hydro carbon gases and for use of huge methane resources in the synthesis of basic chemical products.…”

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confidence: 99%

Effect of the concentrations of methane and ethylene on the composition of the products of their cooxidation

Pogosyan

Strekova

et al. 2015

Russ. J. Phys. Chem. B

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The influence of the ratio of the reactants on the characteristics of the cooxidation of ethylene and methane in a two section flow reactor is examined. It is shown that the radical oxidation of ethylene impli cates methane into the oxidation process. The interaction of the thereby formed methyl radicals with ethylene leads to a significant increase in the yield of propylene, an effect that enables to consider the co oxidation of ethylene and methane as a promising method for producing propylene. A methane rich flame stabilized on the surface of a flat permeable matrix is proposed as a more efficient source of methyl radicals for converting ethylene into propylene.

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Effects of the gas medium and heterogeneous factors on the gas-phase oxidative cracking of ethane

Cited by 18 publications

References 13 publications

Effect of oxygen concentration on the oxidative conversion of propane

Effect of oxygen concentration on the oxidative conversion of propane

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

Effect of the concentrations of methane and ethylene on the composition of the products of their cooxidation

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