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

1981-08-26

1983-12-20

Schor, Kenneth M.

Sugar, starch, and carbohydrates

Processes

Carbohydrate manufacture and refining

127 30, 127 461, 127 50, 435105, 435823, C07H 302, C13K 1300, C13D 302

Patent

active

044215681

ABSTRACT:
A method for producing L-sugars including L-idose and L-gulose as well as 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, oxydizing 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.

REFERENCES:
patent: 1833716 (1931-11-01), Kluyver et al.
patent: 2121533 (1938-06-01), Wells et al.
patent: 2207768 (1940-07-01), Weijlard et al.
patent: 2421612 (1947-06-01), Gray
patent: 3206375 (1965-09-01), Kinoshita et al.
patent: 4029878 (1977-06-01), Kruse
patent: 4173514 (1979-11-01), Kruse

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