Process for preparing m-chloroaromatics

US5466881A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Michael Pies · Duisburg, DE
• Helmut Fiege · Leverkusen, DE
• Lothar Puppe · Burscheid, DE
• Josef Kasbauer · Wermelskirchen, DE

Key dates

• Filing date: Apr 22, 1994
• Grant date: Nov 14, 1995
• Expiry date: Apr 22, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C17/358
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In the preparation of m-chloroaromatics by isomerizing corresponding o- and/or p-chloroaromatics in the liquid phase over zeolites, the activity of the zeolites remains at a high level for a particularly long time if the process is carried out in the presence of from 1 to 30 mol % of hydrogen, based on the chloroaromatics used.