FIELD: chemistry.
SUBSTANCE: invention relates to a method for continuous, heterogeneously catalysed partial dehydrogenation of at least one dehydrogenated (C2-C4)-hydrocarbon in gas phase, comprising a procedure where at least one initial gas stream is continuously fed into a reaction space surrounded by jacket which touches the reaction space and has at least one opening for inlet of at least one initial gas stream in the reaction space and at least a second opening for outlet of at least one stream of the formed gas from the reaction space, said initial gas stream containing at least one dehydrogenated hydrocarbon; in the reaction space at least one dehydrogenated hydrocarbon passes through at least one layer of catalyst lying in the reaction space to obtain a gaseous product which contains at least one dehydrogenated hydrocarbon which does not react with the dehydrogenated hydrocarbon; and using an oxidative or a non-oxidative method, molecular hydrogen and/or water vapour are partially dehydrogenated to form at least one dehydrogenated hydrocarbon; at least one stream of the formed gas is continuously removed from the reaction space; the method is characterised by that the surface of the jacket on the side in touch with the reaction space is made from steel S, partially in a layer of thickness d equal to at least 1 mm, said steel having the following composition: from 18 to 30 wt % Cr (chromium), from 9 to 36 wt % Ni (nickel), from 1 to 3 wt % Si (silicon), from 0.1 to 0.3 wt % N (nitrogen), from ≥ 0 to 0.15 wt % C (carbon), from ≥ 0 to 4 wt % Mn (manganese), from ≥ 0 to 4 wt % Al (aluminium), from ≥ 0 to 0.05 wt % P (phosphorus), from ≥ 0 to 0.05 S (sulphur) and from ≥ 0 to 0.1 wt % one or more rare-earth metals, and in the rest Fe and impurities due to the synthesis process, where the percentages are associated with total weight, respectively. The invention also relates to a jacket in which the disclosed method is realised.
EFFECT: use of the present invention enables to reduce catalysed thermal decomposition of dehydrogenated hydrocarbon and/or a hydrocarbon capable of being dehydrogenated.
30 cl, 1 ex
