Method for extracting 2-ketone-l-gulonic acid from a polar, preferably aqueous solvent
OwnerThomas Domschke, Martin Merger +2inventors
InventorsThomas Domschke, Martin Merger, Petra Deckert, Friedrich Sauer
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Abstract
The present invention relates to a process for extracting 2-keto-L-gulonic acid (KGA) from a polar, preferably aqueous, solvent, preferably from a solvent which comprises a mixture of ascorbic acid and 2-keto-L-gulonic acid, by means of liquid/liquid extraction using an extractant which comprises a tertiary amine and a polar organic diluent. The process of the invention preferably also comprises steps for back-extraction of the KGA and recycling of the extractant. The present invention likewise relates to a process for preparing ascorbic acid from KGA and isolating the prepared ascorbic acid.
Claims17
A process for extracting 2-keto-L-gulonic acid (KGA) from a polar solvent comprising ascorbic acid and 2-keto-L-gulonic acid, which process comprises the following step:
- (a) extraction of the 2-keto-L-gulonic acid from the polar solvent with an extractant 1 comprising a tertiary amine of the formula
- where R1, R2 and/or R3 is in each case a saturated unbranched or branched alkyl radical having, independently of one another or simultaneously, 6 to 14 carbon atoms;
- and a polar organic diluent;
- where the diluent is a saturated branched or unbranched alkyl alcohol having 8 to 12 carbon atoms or an amide or an aromatic compound,
- and where the extractant 1 has a miscibility gap with the solvent.
Dependencies are inferred from the claim text.