Patent · US Expired

Process for preparing bis-(4-hydroxyaryl) alkanes

US6211417A · kind A · utility

20Cited by

5References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gerd Fengler · Krefeld, DE
Hans-Josef Buysch · Krefeld, DE
Frieder Heydenreich · Düsseldorf, DE
Rob Eek · Bergen op Zoom, NL
Gerhard Fennhoff · Willich, DE

Key dates

Filing date	Jul 12, 1999
Grant date	Apr 3, 2001
Priority date	—
Expiry date	Jul 12, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C37/20
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for the production of bis-(4-hydroxyaryl)-alkanes by a heterogeneously catalyzed reaction of aromatic hydroxy compounds with ketones in at least two reactors connected in series, which, as the reaction progresses, are operated at higher temperatures, wherein the total quantity of ketone is divided between the individual reactors in such a manner that the higher is the temperature of the particular reactor, the smaller is the proportion per reactor, the highest possible reactor loading is maintained and the temperatures and temperature gradients are kept as low as possible.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.