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Brian P. Roy, Barbara van Lierop, Richard Berry & André Audet
Pulp and Paper Research Institute of Canada
Increasing the reaction temperature in alkaline peroxide bleaching to temperatures of >100°C greatly accelerated both the rate and extent of pulp delignification. The use of higher temperatures increased the extent of lignin removal for a given charge of hydrogen peroxide. When using short reaction times (<20 minutes),="" increasing="" the="" peroxide="" charge="" was="" less="" effective="" in="" increasing="" the="" extent="" of="" delignification="" than="" was="" increasing="" the="" temperature.="" additional="" retention="" time="" at="" atmospheric="" pressure="" can="" be="" used="" to="" increase="" the="" extent="" of="" delignification.="" the="" addition="" of="" oxygen="" to="" the="" high="" temperature="" peroxide="" stage="" when="" used="" to="" treat="" an="" oxygen-delignified="" pulp="" increased="" the="" delignification="" to="" a="" limited="">
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High Temperature Alkaline Peroxide Bleaching of Kraft Pulps, 1995 Pulping Conference Proceedings