Patent · US Expired

Work-up of residues in the preparation of carboxylic acids

US7084300B2 · kind B2 · utility

6Cited by

6References

21Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Juergen Herwig
Ralf Richter · Dresden, DE
Martin Roos · Oestrich-Winkel, DE
Georg Oenbrink · Schneverdingen, DE

Key dates

Filing date	Apr 11, 2003
Grant date	Aug 1, 2006
Priority date	—
Expiry date	Apr 11, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/42
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Degradation acids obtained in the synthesis of carboxylic acids, in particular dicarboxylic acids, having from 8 to 16 carbon atoms may be isolated by separating the degradation acids in the form of a solid from the crude reaction mixture, then washing the degradation acids in the form of an oil with water at an elevated temperature. The resulting degradation acids having low oxidant and metal contents, and the metal catalyst may be recirculated back to the process.

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