Extended Oxygen Delignification with the Oxy Trac<SUP>TM</SUP> Process
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概要
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Many mills have adopted oxygen delignification systems in order to decrease chemical consumption in a bleaching plant since 1970's.<BR>Generally, the maximum delignification obtained by oxygen delignification system keeping pulp strength has been considered about 50% for softwood pulp because possible delignification by oxygen is limited to certain groups of residual lignin after cooking.<BR>Valmet has reviewed the reaction of oxygen delignification factor by factor to meet the current demand of reducing environmental impact with ECF/TCF bleaching sequence and has developed a new two-stage oxygen delignification process named "OxyTrac<SUP>TM</SUP>" which improves selectivity and enables to obtain 70-75% delignification on softwood without quality degradation.<BR>The OxyTracTM process has already been adopted in several mills in the world showing better results than laboratory results especially on bleachability, pulp strength and kappa reduction.<BR>One of the new facts found in the mills is an effect of oxidized COD recirculation. In the OxyTrac<SUP>TM</SUP> process, COD is acting as chelating agent to protect a rection of hydrogen per oxide which is creating in OxyTrac<SUP>TM</SUP> process.<BR>This paper reports the process of OxyTrac<SUP>TM</SUP> and its performance on pulp quality, selectivity, bleachability and shive reduction based on data from running installations.
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