HIGH-CONSISTENCY OZONE-BLEACHING TECHNOLOGY

Medium-consistency and high-consistency ozone stages are evaluated bas ed on data from the literature. The effects of mass-transfer processes , ozone consumption, selectivity, and carryover of chemical oxygen dem and are considered. Tests with the high-consistency (HC) ozone stage a re aimed at investigating the optimum parameters. Data are presented f or the rate of the reaction, the correlation between viscosity and str ength properties for elemental-chlorine-free pulps and totally chlorin e-free pulps, the influence of dynamic and static reactors, the effect of temperature, and the effect of closing water loops.