Patent ID: 7518015
Filing Date: 2009-04-14
Classification: B01J,C07C,Y02P

Abstract:
1. A process for heterogeneously catalyzed gas phase partial oxidation of at least one organic starting compound comprising: freshly installing into a reaction chamber, a bed of fixed catalyst; conducting a reaction gas mixture comprising the at least one organic starting compound and molecular oxygen through the bed of fixed catalyst; removing heat of reaction by indirect heat exchange with a fluid heat carrier conducted outside the reaction chamber; replacing a portion of the fixed catalyst bed by a replacement fixed catalyst bed part; wherein the replacing a portion of the fixed catalyst bed takes place when with increasing operating time the activity of the fixed catalyst bed is reduced, the portion of the fixed catalyst bed replaced is not the entire fixed catalyst bed, and a volume-specific activity of the replacement fixed catalyst bed part is lower than a volume-specific activity of the replaced fixed catalyst bed part in its freshly installed state wherein wherein ΔT ΔT