ACTIVATED OXYGEN - A SELECTIVE BLEACHING AGENT FOR CHEMICAL PULPS .4.TOTALLY CHLORINE-FREE BLEACHING - PILOT TRIAL AND PROCESS DESIGNS - REPORTED RESULTS SHOW PROMISE FOR THE TECHNOLOGY

The results of AO bleaching from laboratory tests have been confirmed in a pilot trial. An industrial application is considered technically feasible based on industry-proven monoperoxysulphuric acid technology. Acetone can be recovered by a stripper system similar to those used i n kraft mills to treat foul condensate inorganic chemicals, Na2CO3, an d H2SO4, can be regenerated by a green liquor carbonation process and a wet sulphuric acid production method. The chemical cost for producin g fully-bleached TCF softwood kraft pulps using AO is comparable to th at using peroxide alone.