Method for preparing liquid maltitol and liquid polyols from a raffinate including maltitol

A method for preparing liquid maltitol and liquid polyols from a raffinate including maltitol, comprising:

• obtaining a hydrogenated liquid by hydrogenating a pre-treated raffinate including maltitol, the pre-treated raffinate having a refractive index of 48%-54%, a maltitol content of 15%-40%, a sorbitol content of 25%-40%, and an oligosaccharide alcohol content of 35%˜45%;
• obtaining a post-treated liquid by post-treatment of the hydrogenated liquid to remove impurities;
• obtaining a dilute liquid and a concentrated maltitol solution by membrane-separation of the post-treated liquid;
• and
• using the dilute liquid as the liquid polyols, and obtaining the liquid maltitol by mixing the concentrated maltitol solution with a prepared maltitol solution with a maltitol content of over 50%, wherein the liquid maltitol has a maltitol content greater than or equal to 50%, wherein
• the pre-treatment of the raffinate including maltitol includes membrane concentration or evaporative concentration, first decolorization treatment, and evaporation treatment, and the post-treatment of the hydrogenated liquid includes secondary decolorization treatment and ion exchange treatment.