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Magazine articles
Fundamental molecular characterization and comparison of the O, D0, and E stage effluents from hardwood pulp bleaching, TAPPI Journal 2019
ABSTRACT: The present study characterized effluents from the O, D0, and E stages using nuclear magnetic reso-nance (NMR) and gel permeation chromatography (GPC) techniques to better understand the chemical nature of the dissolved organics formed from the bleaching of a high-yield hardwood kraft pulp. Understanding the structures and molecular weight distribution of these organics is the first step in developing methods to mitigate these contam-inates in the discharged effluents. The results indicated that the molecular weight distribution (MWD) of the dis-solved organics from oxygen delignification effluent is broader than those from D0 and E stage effluents. In addition, the O stage filtrate contained considerable amounts of lignin and xylan fragments, which showed its efficiency in removing such materials. The effluent from the D0 stage contained a lower amount of high molecular weight frag-ments and a higher amount of low molecular weight fragments versus the O-stage filtrate. Aromatic structures were nearly absent in the D0 stage filtrate, but the degraded organic material, presumably from oxidized lignin, contained olefinic (C=C) and carbonyl (C=O) functional groups. Furthermore, higher molecular weight fragments were detected in the E-stage effluent, presumably due to the extensive solubilization and removal of the oxidized lignin generated from the D0 pulp.
Journal articles
Evaporation of Na2CO3-Na2SO4 solutions: A method to evaluate the distribution between bulk and surface crystallization , TAPPI JOURNAL March 2011
Evaporation of Na2CO3-Na2SO4 solutions: A method to evaluate the distribution between bulk and surface crystallization , TAPPI JOURNAL March 2011
Journal articles
Pretreatment to improve adsorption and effectiveness of wet end chemicals for a bleached chemithermomechanical pulp, TAPPI JOURNAL August 2011
Pretreatment to improve adsorption and effectiveness of wet end chemicals for a bleached chemithermomechanical pulp, TAPPI JOURNAL August 2011
Journal articles
2015 TAPPI Centennial Celebration, TAPPI JOURNAL 2015 March - 15MAR100
2015 TAPPI Centennial CelebrationHonoring Our Past, Inspiring Our Future, TAPPI JOURNAL March 2015
Journal articles
The hyperbolic theory of light scattering, tensile strength, and density in paper, TAPPI JOURNAL November 2011
The hyperbolic theory of light scattering, tensile strength, and density in paper, TAPPI JOURNAL November 2011
Journal articles
Effects of softwood morphology and chip thickness on pulping with a displacement kraft batch process, TAPPI JOURNAL, July 1998, Vol. 81(7)
Effects of softwood morphology and chip thickness on pulping with a displacement kraft batch process, TAPPI JOURNAL, July 1998, Vol. 81(7)
Journal articles
Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)
Biofiltration of a-pinene and its application to the treatment of pulp and paper air emissions, TAPPI JOURNAL, August 1998, Vol. 81(8)
Journal articles
The evolution of maintenance management and engineering in the pulp and paper industry over the past fifty years, TAPPI JOURNAL, February 1996, Vol. 79(2)
The evolution of maintenance management and engineering in the pulp and paper industry over the past fifty years, TAPPI JOURNAL, February 1996, Vol. 79(2)
Journal articles
Recycling laminated flexible-packaging materials, TAPPI JOURNAL, March 1996, Vol. 79(3)
Recycling laminated flexible-packaging materials, TAPPI JOURNAL, March 1996, Vol. 79(3)
Journal articles
Optimization of combustion air delivery, TAPPI JOURNAL, September 1998, Vol. 81(9)
Optimization of combustion air delivery, TAPPI JOURNAL, September 1998, Vol. 81(9)
