A method for the catalytic dehydrogenation of propane to propylene

摘要

A method for the preparation of propylene, wherein in a first stage, at least a propane hold pure gas mixture, which also contains oxygen and steam, in continuous operation by a first catalyst bed is passed as a first stage, which has the usual dehydrogenation conditions, then the reaction mixture obtained from the first stage, both h₂O as well as a further propane - and an oxygen-containing gas mixture to be added, in the following the reaction mixture obtained in a continuous mode of operation by a further catalyst bed is passed as the second stage, which has the usual dehydrogenation conditions, then the reaction mixture obtained from the second stage, a partial stream is branched off for the catalyst bed is returned to the first stage, the remaining obtained from the second stage reaction mixture is cooled and a further propane - and oxygen-containing gas mixture is added and subsequently, in a third catalyst bed an oxidation of hydrogen without further dehydrogenation of hydrocarbons is carried out.