公开(公告)号：US20170320803A1

公开(公告)日：2017-11-09

申请号：US14900831

申请日：2015-04-23

Applicant: CLARIANT INTERNATIONAL LTD

Inventor： Oliver RICHTER ,  Gerhard MESTL ,  David LESSER ,  Robert MARX ,  Nadine FROMM ,  Felix SCHULZ ,  Peter SCHINKE ,  Werner PITSCHI

IPC: C07C51/265 ,  B01J23/22 ,  C01G31/02 ,  C07D307/83

CPC classification number: C07C51/265 ,  B01J8/067 ,  B01J23/22 ,  B01J2208/00044 ,  B01J2208/00513 ,  B01J2208/025 ,  B01J2208/065 ,  C01G31/02 ,  C07D307/83 ,  C07D307/89

Abstract: The invention relates to a catalyst arrangement for preparing phthalic anhydride by gas-phase oxidation of aromatic hydrocarbons, which comprises a reactor having a gas inlet end for a feed gas and a gas outlet end for a product gas and also a first catalyst zone made up of catalyst bodies and at least one second catalyst zone made up of catalyst bodies, where the first catalyst zone is arranged at the gas inlet end and the second catalyst zone is arranged downstream of the first catalyst zone in the gas flow direction and the length of the first catalyst zone in the gas flow direction is less than the length of the second catalyst zone in the gas flow direction, characterized in that the first catalyst zone has a higher gap content compared to the second catalyst zone.