Process for the preparation of aminoarylsulphonic acids in sulfolene solvent

US4447368A · kind A · utility

Assignee

• Siemens-Allis · US

Inventors

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

Key dates

• Filing date: Mar 31, 1982
• Grant date: May 8, 1984
• Expiry date: Mar 31, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C309/45
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aromatic aminosulphonic acids which have a reduced content of discoloring by-products are obtained when aromatic amines are reacted with a sulphonating agent in a reaction medium at least some of which consists of tetramethylene sulphone.