Non Degrading TCF Bleaching Sequences Including an Ozone Stage for Hardwood and Softwood Kraft Pulps, and Characterization of the Effluents, 1993 Pulping Conference Proceedings

The response of various pulps (hardwood or softwood kraft or sulfite) to ozone was similar. However the problem of cellulose degradation was relevant only in the case of softwood kraft pulp where pulp quality was really affected by cellulose depolymerization. Full bleaching with the OZP sequence ( 0 for oxygen. Z for ozone and P for hydrogen peroxide ) gave high pulp quality when a proper management of the metal ions was made before Z and before P and some reducing stage was performed before P. Sodium borohydride was the most efficient reagent in this purpose. No toxicity was detected in the OZP effluent.

Author: Chirat, C., Lachenal, D.
Non Degrading TCF Bleaching Sequences Including an Ozone Sta
Non Degrading TCF Bleaching Sequences Including an Ozone Stage for Hardwood and Softwood Kraft Pulps, and Characterization of the Effluents, 1993 Pulping Conference Proceedings
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