EP 1289922 A2 20030312 - METHOD FOR ISOLATING POLYMETHYL ALKANOIC ACIDS AND FOR THE DISPOSAL OF THE RESULTING WASTES
Title (en)
METHOD FOR ISOLATING POLYMETHYL ALKANOIC ACIDS AND FOR THE DISPOSAL OF THE RESULTING WASTES
Title (de)
VERFAHREN ZUR ISOLIERUNG VON POLYMETHYLOLALKANSÄUREN UND ZUR ENTSORGUNG DER DABEI ANFALLENDEN ABFALLSTRÖME
Title (fr)
PROCEDE POUR ISOLER DES ACIDES POLYMETHYLOLALCANIQUES ET POUR ELIMINER LES COURANTS DE REBUT RESULTANT DE CE PROCEDE
Publication
Application
Priority
- DE 10026134 A 20000526
- EP 0105816 W 20010521
Abstract (en)
[origin: WO0190040A2] The invention relates to a method for isolating poly- or monomethyl alkanoic acids of the general formula (I), wherein R is the same or different and represents a substituted or unsubstituted hydrocarbon or a methylol group that is produced from the corresponding polymethylol alkanals or monomethylol alkanals of the general formula (II), wherein R has the meaning indicated above, by oxidation with an aqueous solution of hydrogen peroxide. The method further comprises the following steps: a) crystallization, followed by solid/liquid separation (B), thereby obtaining the acid as the first crystallized product (2a) and a mother liquor (3), b) producing in the mother liquor (3) another crystallized product (2b), and removing the resulting mother liquor (3) in another solid/liquid separation (C) from the crystallized product (2b), and c) disposing of the resulting acid-depleted mother liquor (3).
IPC 1-7
IPC 8 full level
B01D 9/02 (2006.01); C07C 51/285 (2006.01); C07C 51/43 (2006.01); C07C 51/47 (2006.01); C07C 59/105 (2006.01)
CPC (source: EP KR US)
C07C 51/285 (2013.01 - EP KR US); C07C 51/43 (2013.01 - EP US); C07C 51/47 (2013.01 - EP US)
Citation (search report)
See references of WO 0190040A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0190040 A2 20011129; WO 0190040 A3 20020523; CN 1431989 A 20030723; DE 10026134 A1 20011129; EP 1289922 A2 20030312; JP 2003534304 A 20031118; KR 20030005396 A 20030117; US 2003162996 A1 20030828
DOCDB simple family (application)
EP 0105816 W 20010521; CN 01810215 A 20010521; DE 10026134 A 20000526; EP 01960232 A 20010521; JP 2001586231 A 20010521; KR 20027015945 A 20021125; US 29625402 A 20021121