Process for the preparation of aminonaphthalenesulphonic acids

US4163752A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Otto Barth · Bensberg, DE
• Hans-Joachim Becker · Markt Erlbach, DE
• Horst Behre · Odenthal, DE
• Reinhard Kaiser · Cologne, DE
• Guido Steffan · Odenthal, DE
• Jurgen Zander · Leverkusen, DE

Key dates

• Filing date: Jan 11, 1978
• Grant date: Aug 7, 1979
• Expiry date: Jan 11, 1998

Classification

• Technology area (CPC —): General

Abstract

A process has been invented for the preparation of aminonaphthalenesulphonic acids by the catalytic hydrogenation of salts of nitronaphthalenesulphonic acids with hydrogen in the presence of Raney nickel catalysts at elevated temperature and pressure, said catalysts comprising a combination of fresh Raney nickel catalyst and Raney nickel catalyst which has already been used in prior hydrogenation or hydrogenations.