Search
Use the search bar or filters below to find any TAPPI product or publication.
Filters
Content Type
Publications
Level of Knowledge
Committees
Event Type
Collections
Carbon Monoxide Emissions from Oxygen Delignification and Chlorine Dioxide Bleaching of Wood Pulp, 1997 Pulping Conference Proceedings
Carbon Monoxide Emissions from Oxygen Delignification and Chlorine Dioxide Bleaching of Wood Pulp, 1997 Pulping Conference Proceedings
Chipper Performance Improved Through Analysis of Critical Angles, 1997 Pulping Conference Proceedings
Chipper Performance Improved Through Analysis of Critical Angles, 1997 Pulping Conference Proceedings
Chlorine Dioxide Bleaching of Single Species Samples of Three Hardwood Kraft Pulps; Oak, Maple and Gum, 1997 Pulping Conference Proceedings
Chlorine Dioxide Bleaching of Single Species Samples of Three Hardwood Kraft Pulps; Oak, Maple and Gum, 1997 Pulping Conference Proceedings
Defoamers for Brown Stock Washers, 1997 Pulping Conference Proceedings
Defoamers for Brown Stock Washers, 1997 Pulping Conference Proceedings
Economic Analysis of Brown Stock Washing Systems, 1997 Pulping Conference Proceedings
Economic Analysis of Brown Stock Washing Systems, 1997 Pulping Conference Proceedings
Effluent Closure of Hardwood Pulp Hydrogen Peroxide Bleaching - Focus On Influence of Metal Ions, 1997 Pulping Conference Proceedings
Effluent Closure of Hardwood Pulp Hydrogen Peroxide Bleaching - Focus On Influence of Metal Ions, 1997 Pulping Conference Proceedings
Journal articles
Reducing aox by increasing oxidation potential in the first caustic extraction stage, TAPPI Journal December 2024
Authors: Peter W. Hart and Jeffrey S. Hsieh | Tappi J. 74(11): 117(1991) - ABSTRACT: An increase in the standard oxidation potential of the reinforcing agent in the first caustic extraction stage will reduce the amount of AOX in the stage's effluent. A chlorinated broumstock pulp was treated alternatively in a basic caustic extraction (E) stage, an oxygen-reinforced caustic extraction (EO) stage, and an extraction stage reinforced with oxygen and peroxide (EOP). An AOX reduction of up to 30% was obtained in the effluent from the peroxide-reinforced extraction stage. In addition to the brownstock work, using two different model lignin compounds, we ran tests using oxyen, potassium permanganate, hydrogen peroxide with oxygen, and ozone with oxygen-reinforced caustic stages. In all cases, increasing the oxidation potential of the reinforcing agent decreased the amount of AOX detected in the effluent.
Journal articles
Production of high yield bleached hardwood kraft pulp: Breaking the kraft pulp yield barrier,TAPPI Journal December 2024
Author: Peter W. Hart | TAPPI J. 10(9): 37(2011) - ABSTRACT: A modified kraft pulping process has been developed that successfully breaks the traditional hard-wood kraft pulp yield barrier. The process produces fully bleached, high brightness hardwood kraft pulp with a yield of greater than 53% on wood. Details of the development and processing steps, along with various recovery cycle impacts, are discussed.
Journal articles
Hydrogen peroxide and caustic soda: Dancing with a dragon while bleaching,TAPPI Journal December 2024
Peter W. Hart, Carl Houtman, and Kilby Hirth | TAPPI J. 12(7): 59(2013) - ABSTRACT: When hydrogen peroxide is mixed with caustic soda, an auto-accelerating reaction can lead to generation of significant amounts of heat and oxygen. On the basis of experiments using typical pulp mill process concentration and temperatures, a relatively simple kinetic model has been developed. Evaluation of these model results reveals that hydrogen peroxide-caustic soda systems are extremely sensitive to hydrogen peroxide:caustic soda ratio, transition metal contamination, and temperature. Small changes in initial conditions can result in a closed system becoming explosive. Analysis of model results was used to develop guidelines for safer application of hydrogen peroxide in a mill setting.
Journal articles
Understanding recovery boiler smelt runoff phenomena 15-Jan-41
Understanding recovery boiler smelt runoff phenomena, TAPPI JOURNAL January 2015