Patent · US Expired

Process for the removal of dissolved oxygen from phenol

US6417318B1 · kind B1 · utility

1Cited by

10References

12Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Frieder Heydenreich · Düsseldorf, DE
Rudolf Wagner · Fontnas, CH
Michael Bödiger · Dormagen, DE

Key dates

Filing date	Feb 5, 2001
Grant date	Jul 9, 2002
Priority date	—
Expiry date	Feb 5, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/52
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a method for avoiding undesirable discoloration in polycarbonate production by catalytic removal of dissolved oxygen from phenol by(a) admixing hydrogen with phenol and(b) passing the phenol stream over ion exchangers doped with platinum group metals.

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