Process for the preparation of alpha -D-glucopyranosido-1,6-mannitol and -sorbitol from alpha -D-glucopyranosido-1, 6-fructose

摘要

Sugar alcohols can be prepared from the corresponding sugars by catalytic hydrogenation in aqueous solution with hydrogen, the hydrogenation being carried out continuously at a hydrogen pressure of 100 to 400 bar and a reaction temperature of 40 DEG to 80 DEG C. on support-free shaped bodies which are arranged in a fixed bed and are composed of pressed powders of alloys of the elements of the iron sub group of sub group VIII of the Periodic Table of the Elements containing elements of sub group VI. The shaped bodies have a compressive strength of 20 to 250 N and an internal surface area of 10 to 80 m2/g.