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Journal articles
Open Access
The recyclability of papers treated with environmentally friendly PET polyesters, TAPPI JOURNAL, January 2006, Vol. 5(1) (332 KB)

The recyclability of papers treated with environmentally friendly PET polyesters, TAPPI JOURNAL, January 2006, Vol. 5(1) (332 KB)

Journal articles
Open Access
Evaluation of the APMP process for mature and juvenile loblo

Evaluation of the APMP process for mature and juvenile loblolly pine, TAPPI JOURNAL, July 2006, Vol. 5(7)

Journal articles
Open Access
Influence of the Combined Use of Cationic Starch and Cationi

Influence of the Combined Use of Cationic Starch and Cationic Polyacrylamideon the Quality of Printing Paper, TAPPI JOURNAL, June 2006, Vol. 5(6) (394 KB)

Journal articles
Open Access
Visualization of Liquid-Vapor Phase Change Phenomena in Impu

Visualization of Liquid-Vapor Phase Change Phenomena in Impulse Technology, TAPPI JOURNAL, June 2006, Vol. 5(6) (767 KB)

Journal articles
Open Access
Simulation of the Behavior of Stickie-Contaminated Sheets in

Simulation of the Behavior of Stickie-Contaminated Sheets in a Dryer Section, TAPPI JOURNAL, June 2006, Vol. 5(6) (505 KB)

Journal articles
Open Access
Development of Predictive Oxygen Delignification Models Usin

Development of Predictive Oxygen Delignification Models Using Kinetic Expressions and Neural Networks, TAPPI JOURNAL, May 2006, Vol. 5(5) (151 KB)

Journal articles
Open Access
Upsets in papermaking ash control: various dead-time compens

Upsets in papermaking ash control: various dead-time compensators, TAPPI JOURNAL, October 2006

Journal articles
Open Access
Effects of calcium on peroxide bleaching and washing of ther

Effects of calcium on peroxide bleaching and washing of thermomechanical pulp, TAPPI JOURNAL, October 2006

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.

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