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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
TAPPI Journal Summaries, Paper360º September/October 2019

TAPPI Journal Summaries, Paper360º September/October 2019

Journal articles
Water Sustainability and the North American Forest Products industry, Paper360° September/October 2010

Water Sustainability and the North American Forest Products Industries, Paper360º September/October 2010

Journal articles
Microfilters Reduce Fresh Water Consumption, Paper360° September/October 2010

Microfilters Reduce Fresh Water Consumption, Paper360º September/October 2010

Journal articles
TAPPI JOURNAL Summaries, Paper360° September/October 2010

TAPPI JOURNAL Summaries, Paper360º September/October 2010

Journal articles
ABB's Roger Bailey, Paper360° September/October 2010

Inteview: ABB's Roger Bailey, Paper360º September/October 2010

Journal articles
The role of mill engineering in water conservation, Frontline Focus, Volume 7, Issue 2

Frontline Focus, February 2011

Journal articles
Pipe Systems Under Attack, Frontline Focus, Volume 7, Issue 6

Frontline Focus, June/July 2011

Journal articles
Paper mill maintenance maturing in more ways than one, Frontline Focus, Volume 7, Issue 7

Frontline Focus, August 2011

Journal articles
Maintaining suction roll internal bearings, Frontline Focus, Volume 7, Issue 8

Frontline Focus, September 2011

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