The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 2011
Filed:
Mar. 14, 2007
Applicants:
Dirk Broell, Langen, DE;
Hermann Siegert, Seeheim-Jugenheim, DE;
Inventors:
Dirk Broell, Langen, DE;
Hermann Siegert, Seeheim-Jugenheim, DE;
Assignee:
EVONIK ROEHM GmbH, Darmstadt, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 65/00 (2006.01);
U.S. Cl.
CPC ...
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