Process for the preparation of aminoaryl-sulphonic acids

US4968835A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Heinz U. Blank · Odenthal, DE
• Herbert Emde · Cologne, DE
• Peter Schnegg · Odenthal, DE

Key dates

• Filing date: Dec 11, 1989
• Grant date: Nov 6, 1990
• Expiry date: Dec 11, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C303/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aminoaryl-sulphonic acids can be prepared by reaction of arylamines and sulphuric acid at elevated temperature and under pressure, where water formed and, where appropriate, water present as water of dilution, is left in the reaction mixture until the end of the reaction.