Methane pyrolysis in an externally heated tubular reactor inevitably ends with clogging of the reactor. Thin molten metal wall films protect the walls from carbon depositions. A falling film reactor and a rotating film reactor are investigated by CFD simulation. The results show the considerable advantages of a rotating film reactor compared to the vertical film reactor. An alternative route for carbon production from methane is the implementation of an exothermic chlorination reaction. The tubular reactor concept involves the inflow of inert gas at the reactant inlet and through porous walls to ensure that the reaction takes place in the center, thus, largely reducing carbon deposits.

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So far, no complete reaction mechanism has been proposed for high temperature chlorination and pyrolysis of methane. Various mechanisms for the description of this reaction pathway are combined and compared in this paper. This adaptation shows that the gas phase pyrolysis of methane and methyl chloride can be combined with surface reactions via nucleation from the gas phase or on the reactor wall to reproduce the product spectrum. In addition, kinetic parameters for a global simplified one-step mechanism focused on the formation of carbon are fitted to available experimental data.

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