Autohydrolysis of Hemicelluloses from Sugarcane Bagasse During Hydrothermal Pretreatment: a Kinetic Assessment
Tóm tắt
A simplified kinetic model for autohydrolysis of hemicelluloses from sugarcane bagasse was evaluated in the context of a global process in a batch reactor. In this work, all sugars, oligomers, and decomposition products from hemicelluloses were taken into account in the determination of kinetic parameters. This approach has not been reported in previous kinetic studies which assume just the xylan, xylose, and furfural as compounds from hemicelluloses. Experimental results for hemicelluloses removal from residual solids and dissolved fractions in the liquor are reported at various temperatures and reaction times. Because of the decomposition of sugars in the pretreatment liquors, optimal temperatures and reaction times were maintained at 170 °C and 90 min. Under these conditions, 61.7 % of hemicelluloses were converted to oligomeric and monomeric sugars. In addition, 90 % of cellulose was preserved in the residual solid fraction. Correlation parameters between the kinetic model and experimental data validate the proposed model, although deviations from an Arrhenius-type model were observed. The reaction steps for production of oligomers, monomers, and sugar derivatives/decomposition compounds present activation energies of 143.1, 158.9, and 138.3 kJ/mol, respectively.
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