Sud-chemie Ag

Süd-Chemie Ip Gmbh & Co Kg

Harald Dialer

Marvin Estenfelder

Werner Pitschi

Christian Guckel

Christian Gückel

Michael Hoffmann

Michael Hoffman

Wermer Pitschi

A charging device for a tubular reactor has metering chambers which can be filled with filling material, such as, for example, catalytically coated carrier material, it being possible for a respective tube of the tubular reactor to be filled via a feed device which adjoins the metering chamber. The metering chamber has a sloping surface and an opposing surface for supporting the filling material, which run at an angle to one another.

Charging device for a tubular reactor

The present invention relates to the use of a catalyst comprising at least one first catalyst zone located towards the gas inlet, a second catalyst zone located closer to the gas outlet and a third catalyst zone located even closer to or at the gas outlet for the preparation of phthalic anhydride by gas-phase oxidation of o-xylene and/or naphthalene, with the catalyst zones preferably each having an active composition comprising TiO, characterized in that the catalyst activity of the first catalyst zone is higher than the catalyst activity of the second catalyst zone. Furthermore, a preferred process for the preparation of phthalic anhydride is described.

Use of a multi-layer catalyst for producing phthalic anhydride

The present invention relates to processes for improving or optimizing a catalyst for the preparation of phthalic anhydride by gas-phase oxidation of o-xylene and/or naphthalene, which comprises the following steps: a) provision of a starting catalyst (C) comprising at least one first catalyst zone located towards the gas inlet and a second catalyst zone located closer to the gas outlet, with the catalyst zones preferably each having an active composition comprising TiO; b) replacement of part of the first catalyst zone by an upstream zone of a catalyst having a higher activity than the first catalyst zone in order to provide an improved catalyst. Furthermore, an improved catalyst obtainable by this process is described.

Method for producing a multi-layer catalyst for obtaining phthalic anhydride

Growing community of inventors

Munich, Germany

Harald Dialer