Mill Scale Application of Peroxyboost, 2002 International Pulp Bleaching Conference Proceedings

Neil Turner, Jane Matthews, Gopal C. Goyal, Rocky W. Smith

Mill trials have been performed in conjunction with Potlatch Corporation in Lewiston, Idaho, USA, to evaluate the industrial application of in-situ peracetic acid generated by reacting T.A.E.D (Tetra Acetyl Ethylene Diamine) and peroxide. The aim of the trials was to assess the potential for reducing total chlorine dioxide consumption in the bleaching sequence.

Mill trials were conducted using in-situ peracetic acid (Pa) under alkaline conditions in an O-Pa-D1-(EOP)-D2 bleaching sequence. The peracetic acid was continuously fed to the post-oxygen stage, high-density storage chest using specifically-designed dosing equipment.

Results from the trial demonstrated that the application of in-situ peracetic acid into the post-oxygen stage, high-density storage chest gave rise to a significant reduction in total chlorine dioxide usage (up to 7.90lbs/ADST pulp). Further trials are planned in order to optimise the T.A.E.D addition: chlorine dioxide savings in order to provide an optimal cost situation.

From a general pulp bleaching perspective, the use of in-situ peracetic acid generated from T.A.E.D and peroxide provides a useful de-bottleneck option for mills with limited chlorine dioxide capacity. Potential for net reductions in bleaching costs via chlorine dioxide replacement is also being investigated.