Patent · US Expired

Continuous isolation of phthalic anhydride and maleic anhydride from reaction gases

US4568427A · kind A · utility

11Cited by

9References

5Claims

0Family size

Assignee

BASF SE

Inventors

Eckehard Danz · Ludwigshafen, DE
Gerd Dumbgen · Schifferstadt, DE
Ernest Miesen · Ludwigshafen, DE
Johannes E. Schmidt · Ludwigshafen, DE
Friedrich Wirth · Ludwigshafen, DE

Key dates

Filing date	Feb 11, 1983
Grant date	Feb 4, 1986
Priority date	—
Expiry date	Feb 11, 2003

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/573
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the continuous isolation of phthalic anhydride and maleic anhydride from the reaction gases obtained by catalytic oxidation of o-xylene or naphthalene with air, wherein the reaction gases are treated with a hydrocarbon of boiling range from 115.degree. to 175.degree. C. as the solvent in a column, and are then treated with an organic solvent of boiling range from 180.degree. to 290.degree. C. in a second column, the phthalic anhydride and maleic anhydride being isolated from the liquid bottom product of the first column.

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