Patent · US Active

Method for the continuous production of unsaturated carboxylic acid anhydrides

US8084640B2 · kind B2 · utility

3Cited by

7References

10Claims

0Family size

Assignee

Evonik Röhm GmbH · DE

Inventors

Dirk Broell · Langen, DE
Hermann Siegert · Weiterstadt, DE

Key dates

Filing date	Mar 14, 2007
Grant date	Dec 27, 2011
Priority date	—
Expiry date	Jun 16, 2028

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02P20/582
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Process for continuously preparing unsaturated carboxylic anhydrides of the general formula IR—C(O)—O—C(O)—R (I)in which R is an unsaturated organic radical having 2 to 12 carbon atomsby transanhydridization of an aliphatic carboxylic anhydride with a carboxylic acid of the general formula IIR—COOH (II)in which R is as defined abovein a rectification column having an upper, middle and lower region, characterized in that

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