Patent · US Expired

Method for producing bisphenols

US6858758B2 · kind B2 · utility

1Cited by

7References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Tony van Osselaer · Krefeld, DE
Werner Verhoeven · Kalmthout, BE
Domien Sluyts · Stabroek, BE

Key dates

Filing date	Jul 16, 2002
Grant date	Feb 22, 2005
Priority date	—
Expiry date	Jul 16, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C37/16
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A method for producing a bisphenol is disclosed. The method entails reacting in at least one first reactant selected from a first group consisting of phenol and substituted phenols with at least one second reactant selected from a second group consisting of ketones and diols, in the presence of hydrogen chloride catalyst and volatile sulphur compound having an SH bond as co-catalyst. The reaction product is a mixture that contains bisphenol, first reactant and second reactant. The catalyst and co-catalyst and water of reaction are separated by distillation. The method is characterized by the high reaction rates and selectivities.

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