EP 2139840 A1 20100106 - METHOD FOR THE RECOVERY OF MALEIC ANHYDRIDE BY DISTILLATION
Title (en)
METHOD FOR THE RECOVERY OF MALEIC ANHYDRIDE BY DISTILLATION
Title (de)
VERFAHREN ZUR DESTILLATIVEN GEWINNUNG VON MALEINSÄUREANHYDRID
Title (fr)
PROCÉDÉ D'OBTENTION D'ANHYDRIDE MALÉIQUE PAR DISTILLATION
Publication
Application
Priority
- EP 2008053322 W 20080319
- EP 07104826 A 20070323
- EP 08718043 A 20080319
Abstract (en)
[origin: WO2008116810A1] The invention relates to a method for the recovery of maleic anhydride by distillation from a solution of maleic anhydride in a high-boiling absorbent. The solution is obtained by the gas phase oxidation of a hydrocarbon and by at least the partial absorption of the oxidation products in the absorbent.For the method, i) the solution is introduced laterally into an inlet column with a reinforcing part above the inlet site and an output part below the inlet site; ii) an upper combining column communicating with the upper end of the reinforcing part and a lower combining column communicating with the lower end of the output part are provided; iii) a take-off column, communicating with the upper combining column and the lower combining column, is provided; iv) maleic anhydride is drawn off as a side take-off from the take-off column, and compounds, boiling lower than maleic anhydride, are taken off at the head of the upper combining column, and the higher boiling absorbent is taken off in the sump of the lower combining column. The maleic anhydride, obtained as a side take-off, has a low acrylic acid and acetic acid content.
IPC 8 full level
C07C 51/573 (2006.01); B01D 3/14 (2006.01); C07C 57/145 (2006.01)
CPC (source: EP US)
B01D 3/14 (2013.01 - EP US); B01D 3/141 (2013.01 - EP US); C07C 51/573 (2013.01 - EP US)
Citation (search report)
See references of WO 2008116810A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008116810 A1 20081002; CN 101675022 A 20100317; CN 101675022 B 20130123; EP 2139840 A1 20100106; TW 200902509 A 20090116; US 2010113805 A1 20100506; US 8461356 B2 20130611
DOCDB simple family (application)
EP 2008053322 W 20080319; CN 200880009584 A 20080319; EP 08718043 A 20080319; TW 97109930 A 20080320; US 53266008 A 20080319