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Understanding the risks and rewards of using 50% vs. 10% strength peroxide in pulp bleach plants, TAPPI Journal November 2018
Authors: Alan W. Rudie and Peter W. Hart | ABSTRACT: The use of 50% concentration and 10% concentration hydrogen peroxide were evaluated for chemical and mechanical pulp bleach plants at storage and at point of use. Several dangerous occurrences have been documented when the supply of 50% peroxide going into the pulping process was not stopped during a process failure. Startup conditions and leaking block valves during maintenance outages have also contributed to explosions. Although hazardous events have occurred, 50% peroxide can be stored safely with proper precautions and engineering controls. For point of use in a chemical bleach plant, it is recommended to dilute the peroxide to 10% prior to application, because risk does not outweigh the benefit. For point of use in a mechanical bleach plant, it is recommended to use 50% peroxide going into a bleach liquor mixing system that includes the other chemicals used to maintain the brightening reaction rate. When 50% peroxide is used, it is critical that proper engineering controls are used to mitigate any risks.
Developing Numeric Nutrient Criteria: Impacts on the Pulp and Paper Industry, 2008 Engineering, Pulping and Environmental Conference
Developing Numeric Nutrient Criteria: Impacts on the Pulp and Paper Industry, 2008 Engineering, Pulping and Environmental Conference
Mixed Brazilian Eucalyptus and Pinus Species - Bleaching Evaluation, 2008 Engineering, Pulping and Environmental Conference
Mixed Brazilian Eucalyptus and Pinus Species - Bleaching Evaluation, 2008 Engineering, Pulping and Environmental Conference
Polymer-Based Peroxide Stabilizer for Recycle Fiber Bleaching, 2008 Engineering, Pulping and Environmental Conference
Polymer-Based Peroxide Stabilizer for Recycle Fiber Bleaching, 2008 Engineering, Pulping and Environmental Conference
Towards Overcoming the Brightness Ceiling of Mechanical Pulps Prepared from Blue-Stained Lodgepole Pine Chips, 2008 Engineering, Pulping and Environmental Conference
Towards Overcoming the Brightness Ceiling of Mechanical Pulps Prepared from Blue-Stained Lodgepole Pine Chips, 2008 Engineering, Pulping and Environmental Conference
Na2CO3 as Alkali in Hydrogen Peroxide Bleaching of Softwood Kraft Pulp, 2011 International Pulp Bleaching Conference
Na2CO3 as Alkali in Hydrogen Peroxide Bleaching of Softwood Kraft 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
Combining Chlorine Dioxide and Molybdate Catalyzed Hydrogen Peroxide for Improved Delignification of Canadian Hardwood and Softwood Pulp, 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
Journal articles
Conversion of paper-grade pulp from rice straw into dissolving pulp, TAPPI Journal June 2025
ABSTRACT: About 1,165 million metric tons of rice straw is generated every year worldwide, which can be a good source for the circular bioeconomy. In this research paper, the paper-grade pulp from rice straw was converted to dissolving-grade pulp by fractionation in a biorefinery initiative. Rice straw was cooked at an optimum condition of 8% potassium hydroxide (KOH) charge for 120 min at 150°C and produced a pulp yield of 47.2% with a kappa number of 18.5. Subsequently, D0(EP)D1 bleaching was carried out for the produced pulp, and the brightness of the pulp reached to 82.4%. From the black liquor, 16.5% of the lignin and 11.9% of the hemicellulose were isolated for producing biobased products and chemicals, and then the spent liquor was used for soil amendment. The bleached pulp was fractionated in a Bauer McNett fiber classifier. The pulp fibers retained on 16-, 30-, and 50-mesh screens were used as a longer fiber fraction pulp, and pulp fibers retained on 100- and 200-mesh screens were used as a shorter fiber pulp. The longer and shorter fiber fraction pulps were analyzed for cellulose, R10, pentosan, and viscosity. The long fiber fraction pulps were characterized by higher cellulose (88.2% vs. 83.1%) and lower pentosan (11.3% vs. 13.0%) content than the shorter fiber fraction pulps. The longer fiber fraction was further treated with cold KOH to remove residual hemicellulose. The KOH extraction reduced pentosan content in pulp to 6.3% and increased á-cellulose content to 91.3%. The short fiber fraction was converted to monomeric sugars using cellulase enzymes with varying reaction time, temperature, and consistency. The efficiency of cellulase activity was assessed through glucose yield and residual dry weight. A temperature of 45°C, 5.0 pH, 5% consistency, and 6 filter paper units/gram (FPU/g) o.d. pulp resulted in maximum sugar conversion of 85.7%.
Closing the Water Cycle of Pulp Mills by Evaporating Bleaching and Debarking Effluents, 1997 Minimum Effluent Mills Symposium Proceedings
Closing the Water Cycle of Pulp Mills by Evaporating Bleaching and Debarking Effluents, 1997 Minimum Effluent Mills Symposium Proceedings