Patent · US Expired

Process for, respectively, the production and purification of dicarboxylic and polycarboxylic acid anhydrides

US4370487A · kind A · utility

8Cited by

7References

5Claims

0Family size

Inventors

Gerhard Meyer · Erlangen, DE
Erich Klimesch · Zell am Harmersbach, DE

Key dates

Filing date	Apr 15, 1981
Grant date	Jan 25, 1983
Priority date	—
Expiry date	Apr 15, 2001

Classification

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

Abstract

A method of preparation and/or purification of acid anhydrides is disclosed. Dicarboxylic or polycarboxylic acids contained in the anhydrides to be treated, are dehydrated in an organic solvent in the presence of activated carbon.

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