Valorisation chimique du gaz naturel par chloropyrolyse du chlorure de méthyle

Abstract : This work is about methane chemical upgrading, a major component in natural gas. Its aim is to obtain, from this latter, sorne. C2 hydrocarbons such as vinyl chloride, ethylene and acetylene. In a first step, methane is converted into a more reactive compound, methyl chloride, using any weil known process of the art. Then, methyl chloride is pyrolysed with molecular chlorine (« chloropyrolysis ») Onder atmospheric pressure, at around 1000 °C, a residence time about ten milliseconds and an initial ratio [Cl2]/[CH3CI] below 0,2. The chosen reactor is an annular cylindrical reactor followed by an annular quenching zone. This reactor is distinguished by a high ratio surface 1 volume which allows an efficient heat exchange. In these conditions, it is possible to obtain a conversion near 30 % with a selectivity into upgradable hydrocarbons C2 (C2H3Cl + C2H4 + C2H2) around 40 %. It seems that molecular chlorîne plays the role of a real inductor in the reaction and it doesn't add any new chemical elements to the C/H/Cl reactional system. On the other hand, its presence in the reactor involves the fonnation of an undesirable compound, methylene èhloride, as weil as the . fonnation of products from this latter. The theorical analysis of the reaction and the detailed review of literature led to the construction of a kinetic model of 504 elementary steps involving 99 species. This one was compared with experimental results on sorne wide operational domains and so, it was validated. Simulations establish the main channels of fonnation and consumption of reagents and observed products.
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Christophe Lombard. Valorisation chimique du gaz naturel par chloropyrolyse du chlorure de méthyle. Autre. Institut National Polytechnique de Lorraine, 2001. Français. ⟨NNT : 2001INPL596N⟩. ⟨tel-01749809⟩

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