| 摘要 |
A method for producing xylitol from D-glucose, D-fructose, D-galactose or mixtures thereof, characterized in that it comprises the steps of: a) oxidation of the starting material to an intermediate that consists mainly of L-xylonic acid, D-arabinonic acid, D-lyxonic acid or a mixture of at least two of said acids, whereby said acids are free or in the form of their salts, lactones or O-formyl derivatives; b) treatment of said intermediate with a hydrogenation catalyst and hydrogen gas in one or several steps to a product consisting mainly of xylitol or a mixture of xylitol, arabinitol and ribitol; c) and, if necessary, separation of xylitol from said product and, if said product consists mainly of said mixture of pentitols, feeding of the fractions of arabinitol and ribitol back to the preceding reaction step b). |
