Three-layered or four-layered catalyst systems for producing phthalic anhydride

US7687425B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Sebastian Storck · Mannheim, DE
• Jürgen Zühlke · Speyer, DE
• Samuel Neto · Brussels, BE
• Frank Rosowski · Mannheim, DE

Key dates

• Filing date: May 15, 2004
• Grant date: Mar 30, 2010
• Expiry date: Jan 10, 2025

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01J2523/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Catalyst systems for preparing phthalic anhydride by means of gas-phase oxidation of o-xylene and/or naphthalene, and a process for preparing phthalic anhydride using the catalyst systems.