Plasma-Chemical Synthesis of Benzene During Methane Pyrolysis in a Bubble Column Reactor with a Melt
摘要
The study is devoted to the simulation of the synthesis of benzene during methane pyrolysis in a bubble column reactor with a melt. It is shown that the use of a bubble column reactor enables stabilizing the temperature in the reaction zone, which significantly increases the methane conversion rate and the selectivity of benzene formation compared to a flow reactor. At an initial temperature of 1400 K and a pressure of 1 atm, the methane conversion rate increases from 15% (in flow reactor) to 44% (in bubble column reactor). The generation of additional radicals (H and CH3) with a concentration of 0.01 vol % using a gas discharge reduces the pyrolysis induction period from 0.7 to 0.025 ms at a temperature of 1375 K, which corresponds to the equilibrium pyrolysis at 1600 K. The reaction sensitivity coefficients for the benzene and hydrogen synthesis are analyzed and the rate of heterogeneous recombination of radicals on the surface of the reactor and a stainless steel membrane is assessed. It is shown that the rate of volumetric recombination of CH3 and H radicals significantly exceeds the rate of their heterogeneous recombination, which allows neglecting the latter when simulating the methane pyrolysis process.