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:
Aug. 07, 2007
Filed:
Oct. 21, 2003
Jörg Pastre, Bensheim, DE;
Kai Michael Exner, Eppelheim, DE;
Wolfram Stüer, Mannheim, DE;
Elke Geissler, Ludwigshafen, DE;
Otto Machhammer, Mannheim, DE;
Jörg Pastre, Bensheim, DE;
Kai Michael Exner, Eppelheim, DE;
Wolfram Stüer, Mannheim, DE;
Elke Geissler, Ludwigshafen, DE;
Otto Machhammer, Mannheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Disclosed is a method for jointly producing (i) formic acid (III); (ii) a carboxylic acid comprising at least two carbon atoms (II) and/or the derivatives thereof; and (iii) a carboxylic acid anhydride (VII). According to said method, (a) a formic acid ester (I) is transesterfied to formic acid (III) and the corresponding carboxylic acid ester (IV) by means of a carboxylic acid comprising at least two carbon atoms (II); (b) at least one portion of the carboxylic acid ester (IV) formed in step (a) is carbonylated in order to obtain the carboxylic acid anhydride (V); and (c) at least one portion of the carboxylic acid anhydride (V) formed in step (b) is further dehydrated by means of a carboxylic acid (VI) so as to form a carboxylic acid anhydride (VII) and the carboxylic acid (II).