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1. WO1997013761 - A PROCESS FOR THE RECOVERY OF ASCORBIC ACID

Publication Number WO/1997/013761
Publication Date 17.04.1997
International Application No. PCT/GB1996/002041
International Filing Date 21.08.1996
Chapter 2 Demand Filed 15.04.1997
IPC
C07D 307/62 2006.01
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
307Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
02not condensed with other rings
34having two or three double bonds between ring members or between ring members and non-ring members
56with 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
62Three oxygen atoms, e.g. ascorbic acid
CPC
C07D 307/62
CCHEMISTRY; METALLURGY
07ORGANIC CHEMISTRY
DHETEROCYCLIC COMPOUNDS
307Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
02not condensed with other rings
34having two or three double bonds between ring members or between ring members and non-ring members
56with 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
62Three oxygen atoms, e.g. ascorbic acid
Applicants
  • YISSUM RESEARCH DEVELOPMENT COMPANY OF THE HEBREW UNIVERSITY OF JERUSALEM [IL]/[IL] (AllExceptUS)
  • WHALLEY, Kevin [GB]/[GB] (SD)
  • EYAL, Aharon, Meir [IL]/[IL] (UsOnly)
  • VITNER, Asher [IL]/[IL] (UsOnly)
  • REUVENY, Tal [IL]/[IL] (UsOnly)
Inventors
  • EYAL, Aharon, Meir
  • VITNER, Asher
  • REUVENY, Tal
Agents
  • ABLEWHITE, Alan, James
Priority Data
11556411.10.1995IL
Publication Language English (EN)
Filing Language English (EN)
Designated States
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.
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