EP 2029565 A1 20090304 - METHOD FOR PREVENTING FUMARIC ACID DEPOSITS IN THE PRODUCTION OF MALEIC ACID ANHYDRIDE
Title (en)
METHOD FOR PREVENTING FUMARIC ACID DEPOSITS IN THE PRODUCTION OF MALEIC ACID ANHYDRIDE
Title (de)
VERFAHREN ZUR VERMEIDUNG VON FUMARSÄUREABLAGERUNGEN BEI DER HERSTELLUNG VON MALEINSÄUREANHYDRID
Title (fr)
PROCÉDÉ POUR ÉVITER DES DÉPÔTS D'ACIDE FUMARIQUE LORS DE LA FABRICATION D'ANHYDRIDE D'ACIDE MALÉIQUE
Publication
Application
Priority
- EP 2007054788 W 20070516
- DE 102006024903 A 20060524
Abstract (en)
[origin: WO2007135072A1] The subject matter of the present invention relates to a method for preventing fumaric acid deposits during the production of maleic acid anhydride consisting of the following steps: a) absorption of a C<SUB>4</SUB>-dicarbonic acid or a derivative thereof from a raw product mixture into an organic solvent or water as an absorbent, (b) separation of the C<SUB>4</SUB>-dicarbonic acid or a derivative thereof from said absorbent, wherein the absorbent thus recovered is either completely or partially hydrogenated catalytically and is returned to absorption stage (a) either completely or partially.
IPC 8 full level
C07D 307/34 (2006.01); C07C 51/64 (2006.01)
CPC (source: EP KR US)
B01J 21/04 (2013.01 - KR); B01J 23/16 (2013.01 - KR); C07C 51/42 (2013.01 - KR); C07C 51/573 (2013.01 - EP US)
Citation (search report)
See references of WO 2007135072A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
DE 102006024903 A1 20071129; CA 2647083 A1 20071129; CN 101448808 A 20090603; CN 101448808 B 20120725; EP 2029565 A1 20090304; JP 2009537592 A 20091029; KR 20090034817 A 20090408; RU 2008150806 A 20100627; RU 2458057 C2 20120810; US 2009143601 A1 20090604; WO 2007135072 A1 20071129
DOCDB simple family (application)
DE 102006024903 A 20060524; CA 2647083 A 20070516; CN 200780018774 A 20070516; EP 07729236 A 20070516; EP 2007054788 W 20070516; JP 2009511478 A 20070516; KR 20087031268 A 20081223; RU 2008150806 A 20070516; US 30057107 A 20070516