Kinetic modeling of the effect of the conditions of conjugate oxidation of propane and ethylene on the yield of propylene

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The study of the oxidation of propane-ethylene mixtures by numerical kinetic modeling allowed us to establish that in the range of 400–600 oC with an increase in the conversion of propane with an increase in temperature, the selectivity of propylene formation passes through a maximum, the position of which depends on the concentration of ethylene in the initial mixture. The addition of ethylene to the initial mixture leads to a reduction in propane consumption and an increase in the selectivity of propylene formation. The conditions under which ethylene introduced into the initial mixture is not consumed during the process are determined, so formally it can be considered as a catalyst, and the process of propane oxidation as proceeding in a pseudo-catalytic regime.

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作者简介

S. Arsentev

Institute of Chemical Physics by A.B. Nalbandyan, National Academy of Sciences of Republic of Armenia

编辑信件的主要联系方式.
Email: arsentiev53@mail.ru
亚美尼亚, Yerevan

A. Davtyan

Institute of Chemical Physics by A.B. Nalbandyan, National Academy of Sciences of Republic of Armenia

Email: arsentiev53@mail.ru
亚美尼亚, Yerevan

Z. Manukyan

Institute of Chemical Physics by A.B. Nalbandyan, National Academy of Sciences of Republic of Armenia

Email: arsentiev53@mail.ru
亚美尼亚, Yerevan

L. Tavadyan

Institute of Chemical Physics by A.B. Nalbandyan, National Academy of Sciences of Republic of Armenia

Email: arsentiev53@mail.ru
亚美尼亚, Yerevan

L. Strekova

N.N. Semenov Federal Research Center for Chemical Physics of Russian Academy of Sciences

Email: arsentiev53@mail.ru
俄罗斯联邦, Moscow

V. Arutyunov

N.N. Semenov Federal Research Center for Chemical Physics of Russian Academy of Sciences

Email: arsentiev53@mail.ru
俄罗斯联邦, Moscow

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2. Fig. 1. Kinetic curves of propane (1, 2) and propylene (3, 4) consumption, obtained experimentally (1, 3) and by modeling (2, 4). Mixture C3H8 : O2 : (Ar + + C3H6) composition 1 : 1 : (0.67 + 0.33), T = 360 °C, P = 270 Torr.

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3. Fig. 2. Dependence of propane conversion KS3H8 (1, 2) and selectivity of propylene formation SC3H6 (3, 4) on temperature, obtained experimentally (2, 3) and by modeling (1, 4). A mixture of C2H4 : C3H8 : O2 composition 4.5 : 8 : 1, P = 660 Torr.

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4. Fig. 3. Dependence of the ratio of the initial concentration of ethylene to its final concentration during the oxidation of a propane-ethylene mixture on the initial concentration of ethylene and the process temperature: 1 - 400 °C, 2 - 450 °C, 3 - 500 °C, 4 - 550 °C, 5 — 600 °C. A mixture of C3H8 : O2 : (C2H4 + N2) composition 10 : 10 : 5, P = 1 atm.

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5. Fig. 4. Calculated dependence of propane conversion of KS3H8 on temperature for various ethylene concentrations in a mixture of C3H8 : O2 : (C2H4 + N2) composition 10 : 5 : 5 at P = 1 atm: 1 - [C2H4]0 = 0. 2 - 5. 3 - 10, 4 - 15, 5 - 25 mol. %.

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6. Fig. 5. Calculated dependence of the selectivity of formation of propylene KS3H8 on temperature for various concentrations of ethylene in a mixture of C3H8 : O2 : (C2H4 + N2) composition 10 : 5 : 5 at P = 1 atm: 1 - [C2H4]0 = 0, 2 - 5, 3 – 15, 4 – 25 mol. %.

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7. Fig. 6. Relative speed of individual stages that contribute to changes in the concentrations of propylene (a) and ethylene (b), calculated at the moment of reaching the maximum concentration of propylene in a mixture of C3H8 : O2 : (C2H4 + N2) composition 10 : 5 : (5 + 0 ) at T = 500 °C.

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