公开(公告)号：US20230212134A1

公开(公告)日：2023-07-06

申请号：US18009005

申请日：2021-07-08

Applicant: Clariant International Ltd

Inventor： Oliver Richter ,  Gerhard Mestl ,  Martin Schoenfelder ,  Werner Pitschi

IPC: C07D307/89 ,  B01J8/06 ,  B01J6/00 ,  B01J23/22 ,  B01J21/06

CPC classification number: C07D307/89 ,  B01J6/001 ,  B01J8/067 ,  B01J21/063 ,  B01J23/22 ,  B01J2208/065 ,  B01J2208/00194 ,  B01J2208/00539

Abstract: The present invention relates to a process for starting up a reactor for preparation of phthalic anhydride by the catalytic oxidation of ortho-xylene and/or naphthalene, containing a bed of shaped catalyst bodies and within a temperature-controlled salt bath. The industrial production of phthalic anhydride from ortho-xylene and/or naphthalene is affected by selective gas phase oxidation in a shell and tube reactor cooled with a salt bath, which may contain several thousand reactor tubes. There are 4 to 5 different catalyst layers in each reactor, which are introduced into each reactor successively in axial direction.

公开(公告)号：US10227319B2

公开(公告)日：2019-03-12

申请号：US15305955

申请日：2015-04-23

Applicant: Clariant International Ltd.

Inventor： Oliver Richter ,  Gerhard Mestl ,  Felix Schulz ,  Werner Pitschi ,  Nadine Fromm ,  Peter Schinke

IPC: C07D307/89 ,  B01J21/06 ,  B01J35/02 ,  B01J27/198 ,  B01J35/10 ,  B01J23/22 ,  B01J8/06

Abstract: A catalytic converter arrangement for producing phthalic anhydride by means of a gas phase oxidation of aromatic hydrocarbons, comprising a reactor with a gas inlet side for a reactant gas, a gas outlet side for a product gas, a first catalytic converter layer made of catalytic converter elements, and at least one second catalytic converter layer made of catalytic converter elements. The first catalytic converter layer is arranged on the gas inlet side, and the second catalytic converter layer is arranged downstream of the first catalytic converter layer in the gas flow direction. The catalytic converter elements have an outer layer of an active compound. The invention is characterized in that the active compound content in the first catalytic converter layer and/or in the second catalytic converter layer is below 7 wt. %, based on the total weight of the catalytic converter elements, and the ratio of the total surface of the active compound to the volume of the catalytic converter layer is preferably 10000 cm−1 to 20000 cm−1, in each catalytic converter layer.

公开(公告)号：US10155713B2

公开(公告)日：2018-12-18

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 ,  C07D307/89 ,  B01J8/06 ,  B01J23/22 ,  C01G31/02 ,  C07D307/83

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.