Method and device for completely hydrogenating a hydrocarbon...

C - Chemistry – Metallurgy – 07 – C

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C07C 5/327 (2006.01) B01J 8/08 (2006.01)

Patent

CA 2586321

The invention relates to a method for hydrogenating material flows in systems for producing alkenes by catalytically dehydrogenating light alkanes, in addition to a device for carrying out said method. All of the unsaturated hydrocarbons contained in the entire hydrocarbon flow which is made of fresh and recycled alkane and which is to be introduced into the dehydrogenation reactor, are subjected to a complete hydrogenation before being introduced into the dehydrogenation reactor. As a result, the formation of coke in the dehydrogenation reactor is drastically reduced. Energy expenditure for preheating the educt flow to the reaction temperature is reduced such that energy released during exothermic hydrogenation remains almost completely in the hydrocarbon flow.

L'invention concerne un procédé pour hydrogéner des flux de matière dans des installations pour produire des alcènes, par déshydrogénation catalytique d'alcanes légers, et un dispositif servant à la mise en oeuvre de ce procédé. Tous les hydrocarbures insaturés contenus dans le flux d'hydrocarbures total, qui est constitué d'alcane frais et recyclé et qui est destiné à être introduit dans le réacteur de déshydrogénation, sont soumis à une hydrogénation complète avant l'introduction du flux d'hydrocarbures dans ledit réacteur, ce qui permet de réduire radicalement la formation de coke dans le réacteur de déshydrogénation. Les dépenses d'énergie pour préchauffer le flux d'éduit en vue de le porter à la température de réaction sont réduites, dans la mesure où la quasi-totalité de l'énergie libérée lors de l'hydrogénation exothermique reste dans le flux d'hydrocarbures.

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