Method for the preparation of ultra-pure bisphenol A and the use thereof

US5696295A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Claus Wulff · Krefeld, DE
• Kaspar Hallenberger · Leverkusen, DE
• Heinrich Steude · Leverkusen, DE
• Kurt P. Meurer · Leverkusen, DE
• Tony van Osselaer · Krefeld, DE
• Jurgen Hinz
• Frank Quaeyhaegens · Mortsel, BE
• Johan Vaes · Kalmthout, BE
• Ignace Hooftman · Kruibeke, BE

Key dates

• Filing date: Apr 6, 1995
• Grant date: Dec 9, 1997
• Expiry date: Apr 6, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/74
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a method for the purification by distillation of p,p-bisphenol A from the melt. The p,p-bisphenol A melt thus obtained is highly heat-stable, stable in storage and colour-stable, is free from high-boiling components and no longer contains any surface-active or non-distillable metal, salt, acid or polymer components and no sulphur-containing components; o,p-BPA and phenol are removed and the low-boiling components are scarcely detectable.