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1. WO2010072473 - METHOD FOR PURIFYING LACTIC ACID BY CRYSTALLIZATION

Publication Number WO/2010/072473
Publication Date 01.07.2010
International Application No. PCT/EP2009/065385
International Filing Date 18.11.2009
IPC
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
C
ACYCLIC OR CARBOCYCLIC COMPOUNDS
51
Preparation of carboxylic acids or their salts, halides, or anhydrides
42
Separation; Purification; Stabilisation; Use of additives
43
by change of the physical state, e.g. crystallisation
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
C
ACYCLIC OR CARBOCYCLIC COMPOUNDS
59
Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O-metal, -CHO, keto, ether, groups, groups, or groups
01
Saturated compounds having only one carboxyl group and containing hydroxy or O-metal groups
08
Lactic acid
C07C 51/43 (2006.01)
C07C 59/08 (2006.01)
CPC
C07C 51/43
Applicants
  • GALACTIC S.A. [BE/BE]; Place d'Escanaffles, 23 B-7760 Escanaffles, BE (AllExceptUS)
  • COSZACH, Philippe [BE/BE]; BE (UsOnly)
  • BOGAERT, Jean-Christophe [BE/BE]; BE (UsOnly)
  • MARIAGE, Pierre-Antoine [BE/BE]; BE (UsOnly)
  • CHIANESE, Angelo [IT/IT]; IT (UsOnly)
  • PARISI, Maria-Paola [IT/IT]; IT (UsOnly)
Inventors
  • COSZACH, Philippe; BE
  • BOGAERT, Jean-Christophe; BE
  • MARIAGE, Pierre-Antoine; BE
  • CHIANESE, Angelo; IT
  • PARISI, Maria-Paola; IT
Agents
  • VANDEBERG, Marie-Paule; Avenue Wolfers, 32 B-1310 La Hulpe, BE
Priority Data
2008/070224.12.2008BE
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) METHOD FOR PURIFYING LACTIC ACID BY CRYSTALLIZATION
(FR) PROCEDE DE PURIFICATION DE L'ACIDE LACTIQUE PAR CRISTALLISATION.
Abstract
(EN)
Method for purifying lactic acid by crystallization in one or more steps, characterized in that crystals are formed starting from an impure aqueous solution of lactic acid having a coloration of > 500 Hazen, at a concentration of between 85% and 95%, by controlling the level of lactic acid oligomers expressed in terms of a relative monomer content above 80% and controlling the degree of supersaturation of the solution between 1% and 60% in order to obtain lactic acid crystals having a specific surface area by mass of < 0.05 m2/g.
(FR)
Procédé de purification de l'acide lactique par cristallisation en une ou plusieurs étapes caractérisé en ce que l'on forme des cristaux au départ d'une solution aqueuse impure d'acide lactique de coloration > 500 Hazen, à une concentration comprise entre 85 et 95 % en contrôlant le taux en oligomères d'acide lactique exprimé par une teneur en monomères relative supérieure à 80% et en contrôlant le degré de sursaturation de la solution entre 1 et 60% afin d'obtenir des cristaux d'acide lactique ayant une surface spécifique massique < 0,05 m2/g.
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