公开(公告)号：DE10249928A1

公开(公告)日：2004-05-06

申请号：DE10249928

申请日：2002-10-26

Applicant: BASF AG

Inventor： PASTRE JOERG ,  EXNER KAI MICHAEL ,  STUEER WOLFRAM ,  GEISLER ELKE ,  MACHHAMMER OTTO

IPC: C07C51/09 ,  C07C51/54 ,  C07C51/56 ,  C07C53/02

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).