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The kinetics of ASAM and kraft pulping of eucalypt wood ( Eucalyptus globulus ) were studied in relation to delignification and polysaccharide removal. In comparison to kraft, ASAM pulping had lower mass losses and delignification for the same temperature and reaction times (59.2% at Kappa 25 vs 50.0% at Kappa 17, at 180°C). The ASAM pulps have a higher brightness. ASAM pulping had a short initial period with no mass loss and lignin removal, followed by two reaction phases: a main phase where 61% of lignin was removed (at 180°C) and a subsequent final phase. In comparison to kraft, the main delignification rates of ASAM pulping were approximately 2.5 slower (at 180°C, −1.8 × 10 −2  min −1  for ASAM and −4.2 × 10 −2  for kraft pulping), and the calculated Arrhenius activation energies were higher (132.4 kJ mol −1  and 83.5 kJ mol −1 , respectively). The loss of cellulose was relatively small (12.5 %) and lower than in kraft pulps.

Kinetics of ASAM and Kraft Pulping of Eucalypt Wood (Eucalyptus globulus)