Patent ID: 7842846
Filing Date: 2010-11-30
Classification: C07C

Abstract:
1. A process for heterogeneously catalyzed partial dehydrogenation of at least one hydrocarbon, the process comprising: passing through a fixed catalyst bed the entirety of a reaction gas mixture input stream comprising molecular oxygen, molecular hydrogen and the at least one hydrocarbon to be dehydrogenated, wherein the fixed catalyst bed is disposed in a shaft with a given cross section and comprises in the flow direction of the reaction gas mixture input stream an inert bed of the length X of inert shaped bodies followed by a catalytically active bed, wherein the catalytically active bed comprises at least one shaped catalyst body which in the reaction gas mixture input stream causes, at least in the entrance region of the catalytically active bed, a lower activation energy to conduct a combustion reaction of molecular hydrogen with molecular oxygen to yield water and/or a combustion reaction of hydrocarbon with molecular oxygen to yield carbon oxides and water followed by the dehydrogenation of the at least one hydrocarbon to at least one dehydrogenated hydrocarbon, with the proviso that a portion of the at least one hydrocarbon to be dehydrogenated is dehydrogenated to the at least one dehydrogenated hydrocarbon, and the reaction gas mixture input stream is obtained in the shaft by metering an input gas II, comprising molecular oxygen with a total volume flow rate V wherein the input gas II is metered in the form of input gas II streams flowing out of a plurality of exit orifices A of a line system disposed upstream of the fixed catalyst bed in flow direction of the input gas stream I such that: