Implementation of the Near-Neutral Chlorine Dioxide Brightening Technology at Domtar Johnsonburg Mill, 2018 PEERS

Near-neutral chlorine dioxide brightening (NNB), a technology proven to improve the performance of the final chlorine dioxide stage in the bleaching of chemical pulps, has been implemented in several pulp mills in North America. This paper presents the results of another successful NNB application at the Domtar kraft mill in Johnsonburg, Pennsylvania.  The implementation’s results showed that the historical brightness loss of as much as 0.8% ISO unit has been eliminated in the HD tower due to the persistent brightening effect of chlorite (NaClO₂), which is the brightening agent generated in the NNB process.  The NNB implementation at this mill resulted in an average savings of 3 to 4 lb chlorine dioxide per ton of pulp while maintaining the target final pulp brightness.  The elimination of gas off issues at the D₂ washer, realized by maintaining a higher pH (greater than five) at the end of the D₂ stage, offered an additional safety benefit. A composite D₂ ClO₂ dosage control equation, specifically designed for this mill, was also developed which, in conjunction with NNB technology, improved D₂ final pulp brightness stability to the HD tower. The implementation of this process requires very little capital expenditures (small piping, valves, pressure gauge and flow meter), making it an attractive technology to many fully-bleached chemical pulp mills. 

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