Patent · US Active

Process for preparing phthalic anhydride

US9765046B2 · kind B2 · utility

2Cited by

8References

13Claims

0Family size

Assignee

BASF SE

Inventors

Nico Fischer · Mannheim, DE
Michael Kramer · Muscatine, US
Jürgen Zühlke · Speyer, DE
Hans-Martin Allmann · Neunkirchen, DE

Key dates

Filing date	Jun 16, 2014
Grant date	Sep 19, 2017
Priority date	—
Expiry date	Jun 16, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/313
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for preparing phthalic anhydride by gas phase oxidation of aromatic hydrocarbons, in which a gas stream comprising at least one aromatic hydrocarbon and molecular oxygen is passed continuously over a thermostatted catalyst and the supply of the at least one aromatic hydrocarbon to the catalyst is temporarily interrupted after putting the catalyst on stream.

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