Patent · US Expired

Method for the production of phenanthrenequinone

US4510090A · kind A · utility

1Cited by

2References

4Claims

0Family size

Assignee

Rutgerswerke Aktiengesellschaft · DE

Inventors

Dietrich Tonnius · Mannheim, DE
Wolfgang Weiss · Ottobrunn, DE
Winfried Orth
Heinrich Miele · Weinheim, DE
Emmerich Pastorek · Hemsbach, DE

Key dates

Filing date	Jan 30, 1984
Grant date	Apr 9, 1985
Priority date	—
Expiry date	Jan 30, 2004

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C2603/26
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Improvement of the yield and purity of phenanthrenequinone during its production by oxidation of phenanthrene by means of chromic acid in a sulfuric acidic medium is achieved by preparing a dispersion made up of phenanthrene, alkali dichromate and water at 95.degree.-100.degree. C., cooling said dispersion down to 80.degree.-85.degree. C. and carrying out the oxidation reaction under cooling and portion-wise addition of concentrated sulfuric acid in a temperature range between 80.degree. and 85.degree. C.

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