EP 1569891 A2 20050907 - CONTINUOUS ETHYL LACTATE PREPARATION METHOD
Title (en)
CONTINUOUS ETHYL LACTATE PREPARATION METHOD
Title (de)
KONTINUIERLICHES VERFAHREN ZUR HERSTELLUNG VON ETHYLLACTAT
Title (fr)
PROCEDE CONTINU DE PREPARATION DE LACTATE D'ETHYLE
Publication
Application
Priority
- FR 0303598 W 20031205
- FR 0215348 A 20021205
Abstract (en)
[origin: FR2848209A1] Continuous production of ethyl lactate comprises esterifying lactic acid with ethanol until the lactic acid conversion is 80% or less, distilling the reaction mixture in a flash column, recycling the bottoms stream from the flash column to the esterification reactor, and distilling the overhead stream from the flash column to produce and overhead stream of ethanol and water and a bottoms stream of ethyl lactate. Continuous production of ethyl lactate comprises esterifying lactic acid with ethanol in an initial ethanol/lactic acid molar ratio of at least 2.5 in the presence of a catalyst at 50-90 degrees C and atmospheric pressure until the lactic acid conversion is 80% or less, distilling the reaction mixture in a flash column at 80-90 degrees C and up to 65 mbar, recycling the bottoms stream from the flash column to the esterification reactor, and distilling the overhead stream from the flash column at atmospheric pressure to produce and overhead stream of ethanol and water and a bottoms stream of ethyl lactate with a water content allowing subsequent purification. An Independent claim is also included for ethyl lactate produced as above with a water content of 0.3% or less.
IPC 1-7
IPC 8 full level
C07C 67/08 (2006.01); C07C 67/54 (2006.01)
CPC (source: EP KR US)
C07C 67/08 (2013.01 - EP KR US); C07C 67/54 (2013.01 - EP KR US); C07C 69/68 (2013.01 - KR)
Citation (search report)
See references of WO 2004052825A2
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)
FR 2848209 A1 20040611; FR 2848209 B1 20061013; AU 2003298421 A1 20040630; AU 2003298421 B2 20080424; BR 0317047 A 20051025; CA 2508125 A1 20040624; CN 1720215 A 20060111; EP 1569891 A2 20050907; JP 2006509024 A 20060316; KR 100762773 B1 20071004; KR 20050084179 A 20050826; MX PA05005962 A 20060208; US 2006041165 A1 20060223; WO 2004052825 A2 20040624; WO 2004052825 A3 20040715; WO 2004052825 A8 20050915
DOCDB simple family (application)
FR 0215348 A 20021205; AU 2003298421 A 20031205; BR 0317047 A 20031205; CA 2508125 A 20031205; CN 200380104917 A 20031205; EP 03796169 A 20031205; FR 0303598 W 20031205; JP 2004558173 A 20031205; KR 20057010224 A 20050604; MX PA05005962 A 20031205; US 53742205 A 20050602