Process for the purification of bisphenol

US5785823A · kind A · utility

Assignee

• Bayer AG Konzernverwaltung RP · DE

Inventors

• Kurt P. Meurer · Leverkusen, DE
• Tony Osselaer · Belsele, BE
• Werner Verhoeven · Kalmthout, BE
• Johan Vaes · Kalmthout, BE
• Ignace Hooftman · Kruibeke, BE
• Willy Van Herck · Brasschaat, BE
• Claus Wulff · Krefeld, DE
• Jurgen Hinz
• Alfred Eitel · Dormagen, DE
• Kaspar Hallenberger · Leverkusen, DE

Key dates

• Filing date: Aug 2, 1996
• Grant date: Jul 28, 1998
• Expiry date: Aug 2, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/685
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing bisphenol A which has a purity of at least 99.95 wt. % of p,p-bisphenol A (BPA). Thermally stable and colour-stable BPA purified in accordance with the invention produces improved thermal and colour stability and improved optical transparency in polymers such as e.g. polycarbonates prepared therefrom.