LOW-TEMPERATURE KINETICS OF ENZYMATIC PINE (PINUS SILVESTRIS) WOOD LIGNIN OXIDATION IN THE ALKALINE MEDIA
Abstract
Kinetics of the enzymatic lignin (brown rotted wood) of pine wood (Pinus silvestris) by oxygen in water-alkaline media at 90–160 °C is studied. The vanillin yield in the process increases from 3 to 5,6 wt. % based on the lignin when increasing the temperature on the shown interval. Calculated value of the observed activation energy varies in the interval 6–19 kJ/mol depending of the experimental conditions. The reaction order with respect to the oxygen pressure was calculated, and it was equal to 1,02 ± 0,05 in the interval of the first two hours of the process. Low value of the process activation energy and the determined value of the reaction order, both these data demonstrate diffusion field of studied kinetics of the process. The obtained kinetic results show that during the oxidation process the role of the degenerated brunch chain process increases due to the formed hydroperoxides destruction. The oxygen emission from water phase as a result of hydroperoxides destruction was registered by volumetric method. A volume of oxygen gas formed corresponds to the hydroperoxides destruction of 16 mol % based on the initial lignin. The increasing function of the temperature dependence of the selectivity process is discussed and explained.
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