Method for extracting 2-ketone-l-gulonic acid from a polar,...

Details Method for extracting 2-ketone-l-gulonic acid from a polar,... Method for extracting 2-ketone-l-gulonic acid from a polar,...

C - Chemistry, Metallurgy

07

H

C07H 7/027 (2006.01) C07H 1/06 (2006.01)

Patent

CA 2510026

The invention relates to a method for extracting 2-ketone-L-gulonic acids from a polar, preferably aqueous solvent, preferably from a solvent which contains a mixture of ascorbic acid and 2-ketone-L-gulonic acid, by means of liquid- liquid extraction with the aid of an extraction agent which contains a tertiary amine and a polar organic diluent. Preferably, the inventive method also comprises steps for retro-extracting the 2-ketone-L-gulonic acid and for returning the extraction agent. The invention also relates to a method for producing ascorbic acid from 2-ketone-L-gulonic acid and for isolating the thus produced ascorbic acid.

L'invention concerne un procédé pour extraire de l'acide 2-céto-L-gulonique à partir d'un solvant polaire, de préférence aqueux, de préférence à partir d'un solvant qui contient un mélange d'acide ascorbique et d'acide 2-céto-L-gulonique, par extraction liquide-liquide au moyen d'un agent d'extraction qui contient une anime tertiaire et un diluant organique polaire. De préférence, le procédé selon l'invention comprend également des étapes de réextraction de l'acide 2-céto-L-gulonique et de recyclage de l'agent d'extraction. L'invention concerne également un procédé pour produire de l'acide ascorbique à partir d'acide 2-céto-L-gulonique et pour isoler l'acide ascorbique produit.

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