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1. (WO2010072473) METHOD FOR PURIFYING LACTIC ACID BY CRYSTALLIZATION
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2010/072473 International Application No.: PCT/EP2009/065385
Publication Date: 01.07.2010 International Filing Date: 18.11.2009
IPC:
C07C 51/43 (2006.01) ,C07C 59/08 (2006.01)
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
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
Agent:
VANDEBERG, Marie-Paule; Avenue Wolfers, 32 B-1310 La Hulpe, BE
Priority Data:
2008/070224.12.2008BE
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.
front page image
Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR, LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PE, PG, PH, PL, PT, RO, RS, RU, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
Publication Language: French (FR)
Filing Language: French (FR)
Also published as:
EP2376418US20110319660CN102227399BRPI0923650