Bisphenol production

US6723885B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Frieder Heydenreich · Düsseldorf, DE
• Michael Prein · Brasschaat, BE
• Michael Bödiger · Dormagen, DE
• Rainer Neumann · Krefeld, DE
• Gerhard Fennhoff · Willich, DE
• Johan Vaes · Kalmthout, BE

Key dates

• Filing date: Aug 26, 2002
• Grant date: Apr 20, 2004
• Expiry date: Aug 26, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/84
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the production of 2,2-bis(4-hydroxyphenyl)propane (BPA) is disclosed. The process that entails reacting acetone with phenol in the presence of cross-linked sulfonated polystyrene resins is characterised in that BPA is separated from the reaction solution downstream of the reaction unit by means of a multi-stage vacuum distillation and a subsequent single- or multi-stage layer crystallisation. The by-product stream with accumulated by-products is returned downstream of the reaction unit.