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UBC Theses and Dissertations

Modelling oxygen delignification in pulp processing operations Susilo, Jacky

Abstract

A mathematical model of oxygen delignification for pulp processing operations has been developed to predict the kappa number (lignin content) and pulp strength (CED viscosity) as a function of system operation variables. The model incorporates a set of appropriate chemical reaction kinetics chosen from those available in the literature and gas-liquid mass transfer resistances for pulp suspension mixing and pulp suspension flow through retention towers as measured in our laboratory. This thesis reviews the available kinetic and mass transfer data incorporated in the model and discusses several important issues related to model development and interpretation, including kappa number measurement, the molecular size distribution of the lignin remaining in the pulp and lignin leaching from the fibre. The model is compared with laboratory experimental data from several sources as well an industrial oxygen delignification system.

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