公开(公告)号：ZA200807008B

公开(公告)日：2009-11-25

申请号：ZA200807008

申请日：2008-08-14

Applicant: BASF SE

Inventor： ULRICH CREMER ,  MARTIN DITERLE ,  MUELLER-ENGEL KLAUS JOACHIM

IPC: C07C20100101

Abstract: Procedure for the long-term operation of a heterogeneously catalyzed partial gas phase oxidation of an organic parent compound to an organic target compound comprises introducing the organic parent compound and reaction gas feed mixture containing molecular oxygen through a freshly-charged fixed bed catalyst that is poured in two spatially following temperature zones A and B at a temperature of T-A and T-B such that the difference between T-B and T-A is greater than 0[deg]C. Procedure for the long-term operation of a heterogeneously catalyzed partial gas phase oxidation of an organic parent compound to an organic target compound comprises introducing the organic parent compound and reaction gas feed mixture containing molecular oxygen through a freshly-charged fixed bed catalyst that is poured in two spatially following temperature zones A and B at a temperature of T-A and T-B such that the difference between T-B and T-A is greater than 0[deg]C, where the difference is determined with the higher temperature as minuend, the reaction gas feed mixture flows through the temperature zones in the temporal succession i.e. zone A followed by zone B, the temperature zone A extends up to the conversion of the organic parent compound of U-A of 15-85 mol.% and in the temperature zone B the conversion of the organic parent compound U-B is greater than or equal to 90 mol.% and in the case of prolonging operation time, one subsequently changes the temperature of the temperature zones in order to act against the reduction of the quality of the fixed bed catalyst with increasing operation time, increasing temperature of the temperature zone that first exhibited the lower temperature and reduces the difference between the temperatures of the two temperature zones, where during the difference in determination of the temperature of the temperature zone, which first exhibited the higher temperature, maintains its position as minuend.