Process for making l-sugars and d-fructose

Details Process for making l-sugars and d-fructose Process for making l-sugars and d-fructose

C - Chemistry, Metallurgy

12

P

195/139, 260/227

C12P 19/02 (2006.01) C07H 3/02 (2006.01) C13K 11/00 (2006.01) C13K 13/00 (2006.01)

Patent

CA 1183480

ABSTRACT A method for producing L-sugars including L-idose and L-gulose as well ad D-fructose from D-glucose. The method comprises epimerizing D-glucose to a mixture of D-glucose and D-mannose, hydrogenating the mixture in a fixed catalyst bed to provide D-sorbitol and D-mannitol, separating the D-mannitol by fractional crystallization, oxidizing separately the D-sorbitol and D-mannitol to provide L-sorbose and D-fructose, respectively; and racemizing the L-sorbose in a weak alkaline solution to provide a mixture of L-sorbose, L-idose and L-gulose, and precipitating the remaining L-sorbose with a dilute lime solution. The unconverted L-sorbose is recovered and recycled.

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