Catalyst system for oxidizing o-xylol and/or naphthalene into phthalic anhydride

US9868713B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Nico Fischer · Mannheim, DE
• Diana Carolina Galeano Nunez · Mannheim, DE
• Michael Kramer · Muscatine, US
• Markus Schubert · Ludwigshafen, DE
• Jürgen Zühlke · Speyer, DE
• Hans-Martin Allmann · Neunkirchen, DE

Key dates

• Filing date: Feb 17, 2015
• Grant date: Jan 16, 2018
• Expiry date: Feb 17, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2002/60
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to a catalyst system for oxidation of o-xylene and/or naphthalene to phthalic anhydride (PA), comprising a plurality of catalyst zones arranged in succession in the reaction tube, which have been produced using antimony trioxide comprising a noticeable proportion of senarmontite wherein some of the primary crystallites have a size of less than 200 nm. The present invention further relates to a process for gas phase oxidation, in which a gas stream comprising at least one hydrocarbon and molecular oxygen is passed through a catalyst system which comprises a plurality of catalyst zones arranged in succession in the reaction tube and which has been produced using an antimony trioxide comprising a noticeable proportion of senarmontite wherein some of the primary crystallites have a size of less than 200 nm.