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Journal articles
Waste to power, TAPPI JOURNAL February 2012
Waste to power, TAPPI JOURNAL February 2012
Journal articles
Delamination in the scoring and folding of paperboard, TAPPI JOURNAL January 2012
Delamination in the scoring and folding of paperboard, TAPPI JOURNAL January 2012
Journal articles
Modeling fine particles and alkali metal compound behavior in a kraft recovery boiler, TAPPI JOURNAL July 2012
Modeling fine particles and alkali metal compound behavior in a kraft recovery boiler, TAPPI JOURNAL July 2012
Journal articles
Extraction of hardwood biomass using dilute alkali, TAPPI JOURNAL June 2012
Extraction of hardwood biomass using dilute alkali, TAPPI JOURNAL June 2012
Journal articles
Influence of topcoat pigment particle size distribution on tail-edge pick resistance in sheet-fed offset printing, TAPPI JOURNAL June 2012
Influence of topcoat pigment particle size distribution on tail-edge pick resistance in sheet-fed offset printing, TAPPI JOURNAL June 2012
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
Imaging of ink jet penetration in uncoated paper using microscopic techniques, TAPPI JOURNAL November 2011
Imaging of ink jet penetration in uncoated paper using microscopic techniques, TAPPI JOURNAL November 2011
Journal articles
Magazine articles
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
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
Magazine articles
A novel approach for determining the reactivity of dissolving pulp based on the COD method
ABSTRACT: A novel approach for determining the reactivity of dissolving pulp according to the chemical oxygen demand (COD) of water has been discussed. First, a sample of dissolving pulp was subjected to mercerization and xanthation in order to obtain dissolved cellulose fractions. Next, the fractions were digested with a testing solution as applied in COD procedures. Finally, the resulting liquid was rapidly tested by ultraviolet-visible spectrophotometry (UV-Vis). By quantifying the absorbance of Cr3+ at a wavelength of 600 nm, the reactivity of dissolving pulp was indirectly calculated. The results measured by this novel COD method correlated well with the most accepted Fock test results with less than 10% relative difference. Meanwhile, this newly developed COD method required less time-consuming procedures as compared to the Fock test.