| abstract |
A process for preparing acrolein or acrylic acid or a mixture thereof from propane, in which propane is dehydrogenated in the presence of a heterogeneous catalyst in a reaction zone A and the propylene formed is partially oxidized heterogeneously in a reaction zone, wherein the reaction zone A is operated in the loop mode and the reaction gas mixture feedstream A fed to the reaction zone A contains added molecular hydrogen which is added to this feedstream as late as possible. |