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THE KINETIC RESEARCH OF CELLULOSE CONVERSION TO POLYOLS
Abstract
This work is aimed at studying of the kinetics of the cellulose hydrolytic hydrogenation process. In the course of the study, the methodology of the process in a high-pressure reactor under subcritical water conditions in the presence of the optimal synthesised catalyst, 3% Ru based on hypercrosslinked polystyrene MN 270 (Purolite Ltd, UK) (3% Ru/MN 270) was developed. The optimal parameters of the cellulose hydrolytic hydrogenation process were selected: the temperature пїЅ 205 пїЅC, the hydrogen partial pressure пїЅ 6 MPa, reaction time пїЅ 60 min, Ru/cellulose ratio (mmol Ru in the composite per 1 g of cellulose) пїЅ 0.042/1, ruthenium content in the composite пїЅ 3% (by weight). Under these conditions, cellulose conversion was 64.0%, sorbitol selectivity was 43.5%. The mechanism of the cellulose conversion in subcritical water in the presence of 3%Ru/MN 270 catalyst was proposed. Besides, an adequate kinetic model of the cellulose conversion process was selected basing on the proposed mechanism. The kinetic parameters for the selected model were calculated: activation energy = 45 kJ/mol, the pre-exponential factor K0 = 8.92пїЅ106, the reaction rate constant K = 0.102713 (mol/mol)?s-1.
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