| Abstract:The independent variable was ozone consumption, responses values were Kappa number, viscosity and brightness, the influence of ozone consumption on pulp properties was studied. A pulp with Kappa number of 8.1, viscosity of 658.4 mL/g and whiteness of 41.9% could be achieved under an optimal condition with ozone consumption was 0.77%. The bleaching selectivity, the efficiency expressed as brightness gain and lignin removal was calculated, the appropriate mathematical models were established by linear regression. The Kappa number estimation function of hardwood kraft pulp by the ozone consumption was:K=7.359（O3CON）-0.2318 and R2was 0.9987. Combined with the equations between viscosity, brightness and Kappa number, when the ozone dosage was 0.77% and other conditions were certain, the Kappa number, viscosity and whiteness of the pulp were predicted to be 7.8, 624.2 mL/g, and 42.9%, respectively. The model could be used to predicate and optimize the bleaching responses of ozone bleaching of low consistency hardwood kraft pulp as the ozone consumption changed. |
