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Journal articles
Open Access
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
Open Access
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
Open Access
Hydrogen peroxide and caustic soda: Dancing with a dragon while bleaching, TAPPI JOURNAL July 2013

Authors: Peter W. Hart; Carl Houtman; and Kilby Hirth | 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.

Small Particle Migration Mechanisms in Consolidating Pigment Coating Layers, 2008 Advanced Coating Fundamentals Symposium

Small Particle Migration Mechanisms in Consolidating Pigment Coating Layers, 2008 Advanced Coating Fundamentals Symposium

Toward Deinking of LEP Inks Printed on Different Substrates, PaperCon 2013

Toward Deinking of LEP Inks Printed on Different Substrates, PaperCon 2013

Combining Chlorine Dioxide and Molybdate Catalyzed Hydrogen Peroxide for Improved Delignification of Canadian Hardwood and Softwood Pulp, 2011 International Pulp Bleaching Conference

Combining Chlorine Dioxide and Molybdate Catalyzed Hydrogen Peroxide for Improved Delignification of Canadian Hardwood and Softwood Pulp, 2011 International Pulp Bleaching Conference

Near-Neutral Final Chlorine Dioxide Brightening: Theory and Practice, 2011 International Pulp Bleaching Conference

Near-Neutral Final Chlorine Dioxide Brightening: Theory and Practice, 2011 International Pulp Bleaching Conference

TCF bleaching character of Soda-anthraquinone pulp from oil palm frond, 2011 International Pulp Bleaching Conference

TCF bleaching character of Soda-anthraquinone pulp from oil palm frond, 2011 International Pulp Bleaching Conference

Bleachability of Eucalypt Kraft Pulp Derived from Auto-Hydrolyzed Chips, 2011 International Pulp Bleaching Conference

Bleachability of Eucalypt Kraft Pulp Derived from Auto-Hydrolyzed Chips, 2011 International Pulp Bleaching Conference

The impact of hot-water extraction (HWE) of Northern Hardwoods on conventional bleach plant operations and potential chemical savings, 2011 International Pulp Bleaching Conference

The impact of hot-water extraction (HWE) of Northern Hardwoods on conventional bleach plant operations and potential chemical savings, 2011 International Pulp Bleaching Conference

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