Catalyst arrangement with optimized void fraction for the production of phthalic acid anhydride

US10155713B2 · kind B2 · utility

Assignee

• CLARIANT INTERNATIONAL LTD · CH

Inventors

• Oliver Richter · Hamburg, DE
• Gerhard Mestl · Munich, DE
• David Lesser · Birkenfeld, DE
• Robert S. Marx · Los Angeles, US
• Nadine Fromm · Großkarolinenfeld, DE
• Felix SCHULZ · Birkenfeld, DE
• Peter Schinke · Munich, DE
• Werner Pitschi · Bogen, DE

Key dates

• Filing date: Apr 23, 2015
• Grant date: Dec 18, 2018
• Expiry date: Apr 23, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/83
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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.