Method for the production of bis(4-hydroxyaryl)alkanes

US6384288B1 · kind B1 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Steffen Kuhling · Meerbusch, DE
• Rolf Lanze · Krefeld, DE
• Rainer Neumann · Krefeld, DE
• Frieder Heydenreich · Düsseldorf, DE
• Tony van Osselaer · Krefeld, DE

Key dates

• Filing date: Apr 16, 2001
• Grant date: May 7, 2002
• Expiry date: Apr 16, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C37/70
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for producing bis(4-hydroxyaryl)alkane is disclosed. The process comprise in sequence the steps of (a) passing inert gas through a melt at 150 to 230° C. that contains bis(4-hydroxyaryl)alkane and other aromatic hydroxy compounds, under conditions designed to remove said other aromatic hydroxy compounds from said melt and to obtain a stream of inert gas that contains said other aromatic hydroxy compounds (b) condensing the stream obtained in (a) to remove said other aromatic hydroxy compound, and to obtain a stream of inert gas, and (c) purifying and compressing the stream of inert gas obtained in (b), and recycling to step (a).