Process for the preparation of xylitol

Abstract

The application discloses a preparation method of xylitol, which comprises the following steps: S1, putting deprotonated seaweed particles into Ni 2+ / MoO4 2‑ in a metal citrate precursor solution to form seaweed-Ni 2+ / MoO4 2‑ ; S2, introducing CO2 into a reaction kettle, heating, and synchronously pulsing a microwave; hemicellulose is converted and xylitol is accumulated; meanwhile, the seaweed-Ni 2+ / MoO4 2‑ is converted into Ni-Mo synergistic active sites; S3, cooling the reaction kettle, separating CO2, adjusting pH to neutral, introducing H2, heating, and catalyzing xylitol to be reduced to xylitol by using the in-situ enriched Ni-Mo active sites of seaweed particles; S4, cooling and decompressing, releasing H2 to normal pressure, concentrating and crystallizing to obtain target xylitol; in the application, the seaweed particles are used as a carrier dispersed catalyst to synchronously release xylitol and convert Ni-Mo synergistic active sites under the action of CO2, and then H2 reduction is performed, so that the yield and purity of xylitol are effectively improved.

Images