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Critical parameters for tall oil separation I: The importance of the ratio of fatty acids to rosin acids
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-4432-9532
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0002-2900-4713
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.ORCID iD: 0000-0001-8817-2031
2019 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 18, no 9, p. 547-555Article in journal (Refereed) Published
Abstract [en]

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. Application: Controlling the ratio of fatty acids to rosin acids in kraft pulping can significantly affect the tall oil separation and improve its yield and quality.

Place, publisher, year, edition, pages
TECH ASSOC PULP PAPER IND INC , 2019. Vol. 18, no 9, p. 547-555
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-262797DOI: 10.32964/TJ18.9.547ISI: 000488856500003OAI: oai:DiVA.org:kth-262797DiVA, id: diva2:1362658
Note

QC 20191021

Available from: 2019-10-21 Created: 2019-10-21 Last updated: 2019-10-21Bibliographically approved

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Dogaris, IoannisLindström, MikaelHenriksson, Gunnar

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