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Journal articles
Open Access
Impulse drying of board grades: converting trials, TAPPI JOURNAL, October 2000, Vol. 83(10)

Impulse drying of board grades: converting trials, TAPPI JOURNAL, October 2000, Vol. 83(10)

Journal articles
Open Access
Infrared analysis for process control in the pulp and paper industry, TAPPI JOURNAL, October 2000, Vol. 83(10)

Infrared analysis for process control in the pulp and paper industry, TAPPI JOURNAL, October 2000, Vol. 83(10)

Journal articles
Open Access
Impact of the cluster rule on the cost competitiveness of the u.s. papermaking industry in the global market, TAPPI JOURNAL, September 2000, Vol. 83(9)

Impact of the cluster rule on the cost competitiveness of the u.s. papermaking industry in the global market, TAPPI JOURNAL, September 2000, Vol. 83(9)

Magazine articles
Open Access
What's new with tappi test methods?, TAPPI JOURNAL, September 2000, Vol. 83(9)

What's new with tappi test methods?, TAPPI JOURNAL, September 2000, Vol. 83(9)

Journal articles
Open Access
Design and operation of a woodwaste cogeneration plant, TAPPI JOURNAL, September 2000, Vol. 83(9)

Design and operation of a woodwaste cogeneration plant, TAPPI JOURNAL, September 2000, Vol. 83(9)

Journal articles
Open Access
Steambox comparator experiments: apparatus validation and investigation of steambox performance, TAPPI JOURNAL, September 2000, Vol. 83(9)

Steambox comparator experiments: apparatus validation and investigation of steambox performance, TAPPI JOURNAL, September 2000, Vol. 83(9)

Journal articles
Open Access
Water minimization in the washing section of a paperboard mill, TAPPI JOURNAL, September 2000, Vol. 83(9)

Water minimization in the washing section of a paperboard mill, TAPPI JOURNAL, September 2000, Vol. 83(9)

Magazine articles
Open Access
Environmental issues continue to be a major industry concern, TAPPI JOURNAL, September 2000, Vol. 83(9)

Environmental issues continue to be a major industry concern, TAPPI JOURNAL, September 2000, Vol. 83(9)

Magazine articles
Open Access
Taiwan holds first symposium on environmentally friendly and emerging technologies for a sustainable industry, TAPPI JOURNAL, September 2000, Vol. 83(9)

Taiwan holds first symposium on environmentally friendly and emerging technologies for a sustainable industry, TAPPI JOURNAL, September 2000, Vol. 83(9)

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.

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