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1. (WO1997013761) A PROCESS FOR THE RECOVERY OF ASCORBIC ACID
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/013761 International Application No.: PCT/GB1996/002041
Publication Date: 17.04.1997 International Filing Date: 21.08.1996
Chapter 2 Demand Filed: 15.04.1997
IPC:
C07D 307/62 (2006.01)
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
D
HETEROCYCLIC COMPOUNDS
307
Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
02
not condensed with other rings
34
having two or three double bonds between ring members or between ring members and non-ring members
56
with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
62
Three oxygen atoms, e.g. ascorbic acid
Applicants:
YISSUM RESEARCH DEVELOPMENT COMPANY OF THE HEBREW UNIVERSITY OF JERUSALEM [IL/IL]; 46 Jabotinsky Street P.O. Box 4279 91042 Jerusalem, IL (AllExceptUS)
WHALLEY, Kevin [GB/GB]; GB (SD)
EYAL, Aharon, Meir [IL/IL]; IL (UsOnly)
VITNER, Asher [IL/IL]; IL (UsOnly)
REUVENY, Tal [IL/IL]; IL (UsOnly)
Inventors:
EYAL, Aharon, Meir; IL
VITNER, Asher; IL
REUVENY, Tal; IL
Agent:
ABLEWHITE, Alan, James; Marks & Clerk 57-60 Lincoln's Inn Fields London WC2A 3LS, GB
Priority Data:
11556411.10.1995IL
Title (EN) A PROCESS FOR THE RECOVERY OF ASCORBIC ACID
(FR) PROCEDE DE RECUPERATION D'ACIDE ASCORBIQUE
Abstract:
(EN) The invention provides a process for the recovery of ascorbic acid from an aqueous feed solution containing the acid at a concentration of less then 0.7 mol/kg, including adsorbing a major portion of the ascorbic acid with a solid phase adsorbent resin selected from resins carrying a pyridine function and resins of similar or weaker basicity, separating the ascorbic acid-containing resin from residual aqueous solution, and subjecting the ascorbic acid-containing resin to a desorbing operation with a neutral solvent at a temperature of at least 20 °C higher than the termperature at which the adsorbtion is carried out, whereby there is obtained a solution of ascorbic acid in solvent in which the concentration of ascorbic acid is at least equal to its concentration in the aqueous feed solution.
(FR) L'invention se rapporte à un procédé de récupération d'acide ascorbique à partir d'une solution d'alimentation aqueuse contenant l'acide dans une concentration inférieure à 0,7 mol/kg. Ce procédé consiste à absorber la majeure partie de l'acide ascorbique avec une résine adsorbant la phase solide sélectionnée parmi des résines portant une fonction pyridine et des résines de basicité similaire ou plus faible, à séparer la résine contenant l'acide ascorbique de la solution aqueuse résiduaire, et à soumettre la résine contenant l'acide ascorbique à une opération de désorption avec un solvant neutre à une température d'au moins 20 °C supérieure à la température à laquelle l'adsorption est réalisée. On obtient ainsi une solution d'acide ascorbique dans un solvant dans lequel la concentration d'acide ascorbique est au moins égale à celle de la solution d'alimentation aqueuse.
Designated States: AL, AM, AT, AU, AZ, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
AU1996068262