Hishamuddin et al J Food Eng IR.pdf (601.15 kB)

Thermodynamic analysis of the isothermal fractionation of palm oil using a novel method for entrainment correction

Download (601.15 kB)
journal contribution
posted on 22.01.2020, 12:24 by Elina Hishamuddin, Zoltan NagyZoltan Nagy, Andy StapleyAndy Stapley
© 2019 Elsevier Ltd The crystallisation kinetics of individual triacylglycerols (TAGs) were studied during the isothermal fractionation of palm oil. On filtration, entrainment of liquid olein within the stearin cake was found to significantly affect measured solid stearin compositions. These could be corrected for entrainment using a mass balance based method along with the assumption that triunsaturated TAGs did not crystallise. These calculations indicated high olein entrainment levels of ~57–59% within the stearin cake, with typically only ~10% of the palm oil crystallising. These values were validated using pulsed NMR solid fat content measurements. The corrected stearin compositions revealed that diunsaturated TAGs were also virtually absent in the solid phase. Crystallisation was initially dominated by trisaturated TAGs, and later by the monounsaturated TAGs once the trisaturates had depleted from the liquid. The time-course of individual TAG crystallisation rates correlated well with chemical potential driving forces based on temperature and composition information, assuming ideal behaviour.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Published in

Journal of Food Engineering

Volume

273

Publisher

Elsevier

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Journal of Food Engineering and the definitive published version is available at https://doi.org/10.1016/j.jfoodeng.2019.109806

Acceptance date

03/11/2019

Publication date

2019-11-06

Copyright date

2020

ISSN

0260-8774

Language

en

Depositor

Dr Andy Stapley Deposit date: 20 January 2020

Article number

109806