Totally Chlorine Free Bleaching for High Brightness Kenaf Bark KP

摘要

The chemical composition of kenaf hark was analysed in this paper,and KP pulping of kenaf bark was optlmlzed, the technology and mechanism of totally chlorine free (TCF) bleaching process (ZFpZP) were studied In detail and compared with that of the high brightness conventional bleaching process (CEHP). With a CEHP conventional blenching sequence, total active chlorine charge being 4.7% and Hydrogen peroxide 0.5% the kenaf bark KP pulp could be bleached to 87.1% SBD. With ZEpZP TCP" bleaching, using total ozone charge 1.7%, and total hydrogen peroxide charge 1.5%, the pulp could be bleached to 87.2% SBD. Although the viscosity of the bleached pulp was lower than that of CEHP pulp, its strength properties were slightly better. SEM observations and IR analysis were employed to illustrate the mechanism of bleaching.