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Journal articles
Open Access
Extended usage of xylanase enzyme to enhance the bleaching of softwood kraft pulp, TAPPI JOURNAL, January 2006, Vol. 5(1) (164 KB)

Extended usage of xylanase enzyme to enhance the bleaching of softwood kraft pulp, TAPPI JOURNAL, January 2006, Vol. 5(1) (164 KB)

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.

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