Process for the preparation of aromatic aminosulphonic acids

US4435336A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: Mar 31, 1982
• Grant date: Mar 6, 1984
• Expiry date: Mar 31, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/46
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aminoarylsulphonic acids which have a relatively high purity and a relatively low content of aminoaryldisulphonic acids can be obtained, if they are prepared, from the corresponding arylammonium hydrogen sulphates, by an improved version of the so-called baking process, wherein the reaction is carried out under pressure at a temperature of at least 140.degree. C. and, at least partially, in the presence of water.