TCF BLEACHING OF SODA-AQ BAGASSE PULP

摘要

Totally Chlorine Free bleaching (OpQPo) of bagasse pulp and the optimum set of operating conditions for non-silicate bleach stabilizers PP-1 and PP-2 in high temperature Po (pressurized hydrogen peroxide bleaching) stage were investigated. PP-1 and PP-2 can be employed to improve the bleaching response of the final Po stage to reach a given target ISO brightness of 85.0%, and without negative impact on pulp viscosity. The operating conditions were: Op: oxygen pressure 0.6MPa, time 60 min, 2% NaOH, 0.5% MgSO4, 0.5% H2O2. Po: oxygen pressure 0.5MPa, temperature 100°C, time 120 min, 3% H2O2, 0.1% PP-1, 0.5% PP-2, 0.5% MgSO4, 1.0% NaOH.