Hardwood Pulping Kinetics of Initial, Bulk and Residual Phases, 2014 PEERS Conference

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In an attempt to improve the utilization of different hardwood species, this study analyzed the kinetics of initial, bulk and residual delignification phases of Eucalyptus nitens, E. globulus, E. benthamii, acacia, maple and Loblolly pine. Kinetics experiments were performed using a Microwave Digestion System model Milestone Ethos EX for fast heating of the kraft liquor. Delignification rates were obtained for three different temperatures (150°C, 160°C and 170°C) and correlated with wood S/G ratio. Activation energy values were also calculated and they appear to have a linear correlation with wood S/G ratio. It was also found a linear correlation between the Kraft delignification rate and the S/G ratio. This study can provide a better understand of semi-chemical and low kappa pulping process and also bioconversion industry, identifying opportunities for optimum raw materials selection based on delignification behavior.