KINETICS OF THE HYDROLYTIC HYDROGENATION OF INULIN TO MANNITOL ON Ru-CONTAINING MAGNETIC CATALYST

Mannitol is an important raw material in the production of resins, lubricants, coatings, surfactants, explosives, cosmetics and drugs. One of the promising ways to obtain it is the catalytic conversion of inulin, a natural polyfructosan found in large quantities in some agricultural crops. In this study, for the first time, a Ru-containing polymer catalyst based on a mesoporous matrix of hypercrosslinked polystyrene was proposed for the process of hydrolytic hydrogenation of inulin to mannitol. Under optimal reaction conditions (0.1167 mmol of Ru in the composition of the catalyst per 1 g of inulin; 30 ml of H2O; temperature 150 & DEG;C; hydrogen partial pressure 60 bar; reaction time 45 min), a high mannitol selectivity of 48.7% was obtained 100% conversion of the original polysaccharide. At the same time, the productivity of the polymer catalyst turned out to be higher than the productivity of the magnetic catalyst based on mesoporous silicon dioxide, which we syn-thesized in previous studies. In the course of the work, kinetic experiments were carried out, the regularities of the reaction of hydrolytic hydrogenation of inulin with the formation of mannitol and a number of minor products were revealed. Based on the experimental data obtained, a reac-tion scheme was proposed, a mathematical model of the process that most adequately describes the experimentally obtained data, and its parameters were calculated. The polymeric magnetic catalyst turned out to be stable under hydrothermal reaction conditions, easily separated from the liquid phase of the catalyzate by an external magnetic field, which makes it promising, in particular, for use in the processes of conversion of plant biomass into raw materials for chemical synthesis and fuel production.