A method for the production of olefinically unsaturated compounds by preferential aet not - oxidative dehydrogenation, and which can be applied to this catalyst

摘要

P the present invention relates to a process for the preparation of a compound whose formula is r - chch, for the dehydrogenation without oxidation of a compound whose formula is r - ch - ch, r representing a phenyl group, alkyl or alkenyl. / p & & p & this process comprises the passage of a mixture of a compound whose formula is r - ch - ch, r representing a phenyl group, alkyl or alkenyl, and of steam superheated, at the temperature of dehydrogenation, on a catalyst which is a spinel, containing an alkali metal oxide and of the vanadium oxide serving as promoters. / p & & p & application in the manufacture of styrene. / p