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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

Magazine articles
Five Steps to Excellent Communications on the Job, Solutions!, February 2006, Vol. 89(2) (159 KB)

Five Steps to Excellent Communications on the Job, Solutions!, February 2006, Vol. 89(2) (159 KB)

Magazine articles
A Retirement Tribute to Wayne H. Gross, TAPPI President, Solutions!, January 2006, Vol. 89(1) (68 KB)

A Retirement Tribute to Wayne H. Gross, TAPPI President, Solutions!, January 2006, Vol. 89(1) (68 KB)

Magazine articles
The World Looks Just a Little Brighter in 2006, Solutions!, January 2006, Vol. 89(1) (38 KB)

The World Looks Just a Little Brighter in 2006, Solutions!, January 2006, Vol. 89(1) (38 KB)

Magazine articles
Are you in the MRO Parts Business or Pulp and Paper?, Solutions!, January 2006, Vol. 89(1) (104 KB)

Are you in the MRO Parts Business or Pulp and Paper?, Solutions!, January 2006, Vol. 89(1) (104 KB)

Magazine articles
Has Safety Compliance Become "Groundhog Day?�, Solutions!, March 2006, Vol. 89(3) (106 KB)

Has Safety Compliance Become "Groundhog Day?”, Solutions!, March 2006, Vol. 89(3) (106 KB)

Magazine articles
Europe Maps A Course Toward The Inudstry Of Tomorrow, Solutions!, April 2006, Vol. 89(4) (498 KB)

Europe Maps A Course Toward The Inudstry Of Tomorrow, Solutions!, April 2006, Vol. 89(4) (498 KB)

Magazine articles
People on the move, Solutions!, August 2004, Vol. 87(8) (78KB)

People on the move, Solutions!, August 2004, Vol. 87(8) (78KB)

Magazine articles
TAPPI-PIMA student summit: unique learning, â??amazingâ?? mill visit, Solutions!, August 2004, Vol. 87(8) (203KB)

TAPPI-PIMA student summit: unique learning, ‘amazing’ mill visit, Solutions!, August 2004, Vol. 87(8) (203KB)

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