OBTAINING XYLITOL BY HYDROLYSIS-HYDROGENATION OF LIQUORS DERIVED FROM SUGARCANE BAGASSE DOBIJANJE KSILITOLA HIDROLIZOM-HIDROGENACIJOM OTPADNOG LUGA IZ OBRADE BAGAZE ŠEĆERNE TRSKE

CERIONI, JULIETA L.; VALLEJOS, MARIA E.; FELISSIA, FERNANDO E.; AREA, MARÍA C.; NICHIO, NORA N.; SANTORI, GERARDO F.

CHEMICAL INDUSTRY AND CHEMICAL ENGINEERING QUARTERLY

ASSOC CHEMICAL ENG

Año: 2023 vol. 29 p. 43 - 52

1451-9372

This work presents the study of heterogeneous catalysis of sugarcane bagasse hydrothermal treatment spent liquors using a sulfonated resin. Besides, results were compared with those obtained by a conventional route using sulfuric acid as a homogeneous catalyst. Heterogeneous catalysis is suitable for the hydrolysis of sugarcane bagasse hydrothermal liquors under mild conditions (100 °C and 6 h). The obtained maximum xylose yield was 82% due to furfural formation, which causes a xylose selectivity drop. The hydrogenation of this xylose-rich liquor at 100 °C and 3 MPa of hydrogen pressure employing a supported Ni/γ-Al2O3 produced the total conversion of xylose with a selectivity towards xylitol of 100% by using a catalyst to xylose mass ratio of 0.5. Heterogeneous catalysis in a two-step route (hydrolysis and hydrogenation) constitutes an outstanding alternative to producing xylitol from sugarcane bagasse hydrothermal spent liquors since materials can be easily separated and reused in several reaction cycles.