Patent ID: 7723549
Filing Date: 2010-05-25
Classification: B01J,C07C,Y02P

Abstract:
1. A process for preparing at least one target product P by partial oxidation and/or ammoxidation of propylene, comprising a) subjecting prepurified propane, in a first reaction step in the presence of and/or with exclusion of molecular oxygen, to at least one dehydrogenation from the group comprising homogeneous dehydrogenation, heterogeneously catalyzed dehydrogenation, homogeneous oxydehydrogenation and heterogeneously catalyzed oxydehydrogenation to obtain a gas mixture 1 comprising unconverted propane and formed propylene, and b) optionally, removing a portion or the entirety of the constituents other than propane and propylene present in the entirety or in a portion of gas mixture 1 therefrom and/or converting them to other compounds to obtain a gas mixture 1′ comprising propane and propylene, and, in at least one further reaction step, c) subjecting gas mixture 1 or gas mixture 1′ or a mixture of formed gas mixture 1′ and remaining gas mixture 1, as a constituent of a gas mixture 2, to a heterogeneously catalyzed gas phase partial oxidation and/or partial gas phase ammoxidation of propylene present in gas mixture 1 and/or gas mixture 1′ to obtain a gas mixture 3 comprising at least one target product P, d) removing target product from gas mixture 3 in at least one removal step and, of the remaining residual gas, recycling at least the propane into the first reaction step, wherein the prepurified propane is obtained from crude propane which comprises with the proviso that the crude propane is conducted into a rectification column and the purified propane is removed above the feed point with the proviso that the content of C