Patent · US Expired

Method for producing maleic anhydride

US6989454B2 · kind B2 · utility

2Cited by

23References

9Claims

0Family size

Assignee

BASF SE

Inventors

Hartmut Hibst · Schriesheim, DE
Ralf Noe · Mannheim, DE
Kai Michael Exner · Eppelheim, DE
Mark Duda · Ludwigshafen, DE

Key dates

Filing date	Jul 17, 2002
Grant date	Jan 24, 2006
Priority date	—
Expiry date	Jul 20, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D307/60
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of an n-butene-containing hydrocarbon stream by means of oxygen-containing gases in a shell-and-tube reactor having two successive reaction zones, where the first, feed-side reaction zone contains at least one catalyst which is suitable for the oxydehydrogenation of n-butenes to 1,3-butadiene and the second, product-side reaction zone contains at least one catalyst which is suitable for the oxidation of 1,3-butadiene to maleic anhydride, is carried out using a shell-and-tube reactor which has at least one heat transfer medium circuit in the region of the first, feed-side reaction zone and at least one further heat transfer medium circuit in the region of the second, product-side reaction zone.

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