Kinetics of SO2-Alcohol-Water (SAW) Pulping of Sugarcane Straw (SCS), 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

Pulping kinetics of sugarcane straw (SCS) using the SO2-Alcohol-Water (SAW) system were investigated with different solvents (methanol, ethanol and iso-propanol) in order to evaluate the effect of the solvents. The methanol, ethanol and iso-propanol SAW pulps are identified as SMW, SEW and SPW respectively. The pulping experiments were carried out at 135, 145 and 155°C with cooking liquor (L/F = 4 L/Kg feedstock) composition; SO2/Alcohol/Water of 12/44/44 wt %. The pulps were characterized in terms of yield, kappa number, viscosity, cellulose and hemicellulose and lignin content. After a fast initial dissolution phase, two regimes of delignification were identified in all solvent systems; a bulk and residual phase. Bulk delignification and xylan removal followed first order kinetics in residual lignin and xylan respectively, while the cellulose hydrolysis rate was zeroth order in cellulose. 

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