Kinetic modeling of multi‐component crystallization of industrial‐grade oils and fats

Jeppe L. Hjorth, Rasmus L. Miller, John M. Woodley, Søren Kiil

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Transient crystallization kinetics is investigated for complex, industrial‐grade vegetable oils consisting of more than ten triacylglycerols (TAG). The classical nucleation model has been used to describe primary nucleation, while secondary nucleation has been described by a semi‐empirical approach. Growth is modeled using a modified Burton‐Cabrera‐Frank (BCF) model. Surface tensions and growth constants have been determined using focused‐beam‐reflectance measurements (FBRM). The required adjustable parameters in the model have been fitted to overall crystallization curves obtained by solid‐fat content (SFC) measurements for a given oil at different cooling rates and degrees of dilution. The developed model can accommodate more polymorphs simultaneously and performs well with respect to predicting crystallization onset, rate of crystallization and final SFC value. It can also qualitatively describe how higher cooling rates lead to formation of more meta‐stable crystals and smaller mean‐crystal sizes. : The model provides a good starting point for developing more realistic, transient models for TAG crystallization with the ability to accommodate processing conditions and complex chemical compositions. Such a predictive model may provide a powerful tool to screen and optimize oil formulations in industrial processes and allow product developers to evaluate recrystallization events.
Original languageEnglish
JournalEuropean Journal of Lipid Science and Technology
Volume117
Issue number7
Pages (from-to)1066-1078
ISSN1438-7697
DOIs
Publication statusPublished - 2015

Keywords

  • Crystallization
  • Kinetics
  • Mathematical modeling
  • Solid‐fat content
  • Triacylglycerols

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