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Journal articles
Magazine articles
Open Access
Kraft pulp bleaching with a P-stage catalyzed by both bicarbonate and TAED, TAPPI Journal July 2019

ABSTRACT: Peroxide bleaching of softwood and hardwood (eucalypt) kraft pulps was performed in solutions of sodium bicarbonate (NaHCO3), sodium carbonate (Na2CO3), and sodium hydroxide (NaOH). The conventional P stage (hydrogen peroxide + sodium hydroxide; H2O2 + NaOH) was the most effective brightening system without an additional activator. However, peroxide activation by bicarbonate anion (HCO3•) was obvious in all cases where NaHCO3 or Na2CO3 was used. When N,N,N’,N’-tetraacetylethylenediamine (TAED) was added to the bleaching sys-tem, Na2CO3 as the alkali source afforded equal or slightly higher bleached brightness compared to NaOH usage for both the softwood and hardwood pulps. This outcome is attributed to simultaneous peroxide activation by HCO3• and TAED. When applied to the eucalypt pulp, the H2O2/Na2CO3/TAED bleaching system also decreased the bright-ness loss due to thermal reversion.

Journal articles
Magazine articles
Open Access
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
Open Access
Co-firing black liquor and biomass in a laboratory single droplet reactor â?¢ effects on emissions and combustion characteristics, TAPPI JOURNAL September 2010

Co-firing black liquor and biomass in a laboratory single droplet reactor • effects on emissions and combustion characteristics, TAPPI JOURNAL September 2010

Journal articles
Open Access
Global survey on lime kiln operation, energy consumption, and alternative fuel usage, TAPPI JOURNAL August 2011

Global survey on lime kiln operation, energy consumption, and alternative fuel usage, TAPPI JOURNAL August 2011

Journal articles
Open Access
Selectivity of oxygen delignification for southern softwood kraft pulps with high lignin content, TAPPI JOURNAL August 2011

Selectivity of oxygen delignification for southern softwood kraft pulps with high lignin content, TAPPI JOURNAL August 2011

Journal articles
Open Access
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
Open Access
Effects of Acetone Extractives in Gray-Stage Lodgepole Pine Killed by Mountain Pine Beetles, TAPPI JOURNAL February 2011

Effects of Acetone Extractives in Gray-Stage Lodgepole Pine Killed by Mountain Pine Beetles, TAPPI JOURNAL February 2011

Journal articles
Open Access
Near-neutral pre-extraction of hemicelluloses and subsequent kraft pulping of southern mixed hardwoods, TAPPI JOURNAL January 2011

Near-neutral pre-extraction of hemicelluloses and subsequent kraft pulping of southern mixed hardwoods, TAPPI JOURNAL January 2011

Journal articles
Open Access
Identification of acid-insoluble filter-plugging compounds and optimal acid-washing procedures for tubular backpulse pressure filters, TAPPI JOURNAL January 2011

Identification of acid-insoluble filter-plugging compounds and optimal acid-washing procedures for tubular backpulse pressure filters, TAPPI JOURNAL January 2011

Journal articles
Open Access
Cost-effective brightening of thermomechanical pulp from mountain pine beetle-infested lodgepole pine, TAPPI JOURNAL January 2011

Cost-effective brightening of thermomechanical pulp from mountain pine beetle-infested lodgepole pine, TAPPI JOURNAL January 2011

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