PrePox™ and PHT are pressurized hydrogen peroxide bleaching processes that are very efficient for brightness increase. This means that this technology normally should be an integral part of every new bleaching line to be built. The PHT stage is a lower cost alternative to the PrePox™ stage achieving similar results. PHT is also very attractive for retrofits of existing bleaching stages.
PrePox™ and PHT are suitable for the bleaching of both softwood and hardwood kraft pulps and are without question a first hand choice for bleaching of sulphite pulps.
Benefits compared to a conventional D1 / D2-stage:
• Increased brightness ceiling
• Savings of chlorine dioxide
• Reduced AOX discharges to effluent
• Increased bleach plant flexibility