Add time:08/27/2019         Source:sciencedirect.com

New experiments of cellulose acetylation were performed using the ionic liquid 1-allyl-3-methylimidazolium chloride ([Amim]Cl) as a solvent, at temperatures of 80, 60 and 40 °C. An attempt is done to improve the performance of the reaction by pressurizing the reaction with 80 bar of CO2. The results indicate that scCO2 speeds up the kinetics of the reaction probably due to a reduction of the viscosity of the ionic liquid, which favours diffusion of the reactants. Additionally, CHN elemental analysis revealed that cellulose acetate (CA) obtained with scCO2 is of higher quality since it does not incorporate residues of the solvent. A kinetic model able to describe the reaction is proposed and kinetics parameters are adjusted. The model can fit experimental data from the literature obtained at different operation conditions, obtaining different kinetic constants.

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