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Journal articles
Open Access
Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013

Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013

Journal articles
Open Access
A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014

A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014

Journal articles
Open Access
Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014

Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014

Journal articles
Open Access
Brownstock washing A review of the literature, TAPPI JOURNAL January 2014

Brownstock washing A review of the literature, TAPPI JOURNAL January 2014

Journal articles
Open Access
Multiple faults detection and isolation approach applied to a kraft recovery boiler, TAPPI JOURNAL January 2014

Multiple faults detection and isolation approach applied to a kraft recovery boiler, TAPPI JOURNAL January 2014

Journal articles
Open Access
Inter-laboratory comparisons of hexenuronic acid measurements in kraft eucalyptus pulps using a UV-Vis spectroscopic method, TAPPI JOURNAL January 2014

Inter-laboratory comparisons of hexenuronic acid measurements in kraft eucalyptus pulps using a UV-Vis spectroscopic method, TAPPI JOURNAL January 2014

Journal articles
Open Access
Characterization of thin pigment coating layers produced by foam coating, TAPPI JOURNAL July 2014

Characterization of thin pigment coating layers produced by foam coating, TAPPI JOURNAL July 2014

Journal articles
Open Access
Cationization of oat ?-D glucan as a dry-strength additive for paper, TAPPI JOURNAL July 2014

Cationization of oat ?-D glucan as a dry-strength additive for paper, TAPPI JOURNAL July 2014

Journal articles
Magazine articles
Open Access
Critical parameters for tall oil separation I: The importance of ration of fatty acids to rosin acids, TAPPI Journal September 2019

ABSTRACT: Tall oil is a valuable byproduct in chemical pulping of wood, and its fractions have a large spectrum of applications as chemical precursors, detergents, and fuel. High recovery of tall oil is important for the economic and environmental profile of chemical pulp mills. The purpose of this study was to investigate critical parameters of tall oil separation from black liquor. To investigate this in a controlled way, we developed a model test system using a “synthetic” black liquor (active cooking chemicals OH- and HS- ions), a complete process for soap skimming, and determination of recovered tall oil based on solvent extraction and colorimetric analysis, with good reproducibility. We used the developed system to study the effect of the ratio of fatty acids to rosin acids on tall oil separation. When high amounts of rosin acids were present, tall oil recovery was low, while high content of fatty acids above 60% significantly promoted tall oil separation. Therefore, manipulating the content of fatty acids in black liquor before the soap skimming step can significantly affect the tall oil solubility, and hence its separation. The findings open up chemical ways to improve the tall oil yield.

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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