Process for the production of bisphenols

US5302774A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Berg · Krefeld, DE
• Hans-Josef Buysch · Krefeld, DE
• Alfred Eitel · Dormagen, DE
• Gerhard Fennhoff · Willich, DE
• Otto Immel · Krefeld, DE
• Ralf Pakull · Krefeld, DE
• Bernhard Wehrle · Langenfeld, DE
• Claus Wulff · Krefeld, DE

Key dates

• Filing date: Aug 9, 1993
• Grant date: Apr 12, 1994
• Expiry date: Aug 9, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the production of bisphenols from acetone and phenols in the presence of sulfonic acid ion exchanger resins modified with alkyl-SH groups, in which 0.6 to 5% by weight H.sub.2 O is added to the mixture of phenol and acetone before the reaction.