EP 1521737 A1 20050413 - METHOD FOR THE RECYCLING OF A LEWIS ACID
Title (en)
METHOD FOR THE RECYCLING OF A LEWIS ACID
Title (de)
VERFAHREN ZUR RÜCKFÜHRUNG EINER LEWIS-SÄURE
Title (fr)
PROCEDE DE RECUPERATION D'UN ACIDE DE LEWIS
Publication
Application
Priority
- DE 10231292 A 20020710
- DE 10240012 A 20020827
- EP 0307150 W 20030704
Abstract (en)
[origin: WO2004007431A1] The invention relates to a method for the recycling of a Lewis acid from a reaction mixture (I), obtained from the hydrocyanation of an olefinically-unsaturated compound to give a nitrile, which has a miscibility gap with water under certain concentration, pressure and temperature conditions, in the presence of a catalyst system comprising a Lewis acid and a complex compound of a phosphorus-containing compound suitable as a ligand and a central atom suitable for said compound, characterised in that a) said complex compound is separated from a mixture (I) to give a mixture (II), b) mixture (II) is treated with water and undergoes a transformation generating pressure and temperature conditions to give a phase (III) with a higher proportion of water than said nitrile and a phase (IV) which has a higher proportion of said nitrile than of water, whereby phase (III) has a higher content of said Lewis acid than phase (IV), c) phase (III) is treated with a liquid diluent (V) which c1) does not form an azeotrope with water and the boiling point of which is higher than that of water under certain pressure conditions, or c2) forms an azeotrope or heteroazeotrope with water under certain pressure conditions, d) the mixture of phase (III) and liquid diluent (V) is distilled under the pressure conditions given in step c1) or c2) to give a mixture (VI) which has a higher proportion of water than of liquid diluent (V) and a mixture (VII) which has a higher proportion of diluent (V) than water, whereby mixture (VII) has a higher content of said Lewis acid than mixture (VI), and e) mixture (VII) is fed to a hydrocyanation of an olefinically-unsaturated compound to give a nitrile, which has a miscibility gap with water under certain concentration, pressure and temperature conditions, in the presence of a catalyst system comprising a Lewis acid and a complex compound of a phosphorus-containing compound suitable as a ligand and a central atom suitable for said compound.
IPC 1-7
IPC 8 full level
B01J 31/18 (2006.01); B01J 27/32 (2006.01); B01J 31/40 (2006.01); B01J 38/00 (2006.01); C07B 61/00 (2006.01); C07C 253/10 (2006.01); C07C 255/04 (2006.01); C07C 255/07 (2006.01)
CPC (source: EP US)
B01J 27/32 (2013.01 - EP US); B01J 31/1845 (2013.01 - EP US); B01J 31/24 (2013.01 - EP US); B01J 31/4015 (2013.01 - EP US); B01J 31/403 (2013.01 - EP US); C07C 253/10 (2013.01 - EP US); B01J 2231/343 (2013.01 - EP US); Y02P 20/584 (2015.11 - EP US)
Citation (search report)
See references of WO 2004007431A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2004007431 A1 20040122; AR 039736 A1 20050309; AU 2003246375 A1 20040202; BR 0311982 A 20050426; CA 2491240 A1 20040122; CN 1274671 C 20060913; CN 1665776 A 20050907; EP 1521737 A1 20050413; JP 2005538075 A 20051215; MX PA04012030 A 20050307; MY 134370 A 20071231; TW 200401764 A 20040201; US 2005247624 A1 20051110; US 7084294 B2 20060801
DOCDB simple family (application)
EP 0307150 W 20030704; AR P030102270 A 20030625; AU 2003246375 A 20030704; BR 0311982 A 20030704; CA 2491240 A 20030704; CN 03816115 A 20030704; EP 03763704 A 20030704; JP 2004520479 A 20030704; MX PA04012030 A 20030704; MY PI20032257 A 20030617; TW 92118065 A 20030702; US 52000704 A 20041230