METHOD FOR PREPARING LIQUID MALTITOL AND LIQUID POLYOL BY USING MALTITOL CHROMATOGRAPHIC RAFFINATE

The present invention relates to a method for preparing a liquid maltitol and a liquid polyol by using a maltitol chromatographic raffinate, comprising the following steps: hydrogenating a pretreated maltitol chromatographic raffinate to obtain a hydrogenated liquid; performing post-treatment on the hydrogenated liquid to remove impurities to obtain a post-treated liquid; performing membrane separation treatment on the post-treated liquid to respectively obtain a dilute liquid and a maltitol enriched concentrated liquid, the dilute liquid directly serving as a liquid polyol; and blending the maltitol enriched concentrated liquid with an existing maltitol blended liquid having a maltitol content of higher than 50% to obtain a liquid maltitol having a maltitol content of ≥ 50% and conforming to the national standard. In the present invention, before membrane separation treatment is employed, the reducing sugar component in the sugar liquid is reduced by using a hydrogenation method, the risk that the color turn