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Mitigating crystallization of saturated FAMEs (fatty acid methyl esters) in biodiesel: 2. The phase behavior of 2-stearoyl diolein–methyl stearate binary system

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  • Baker, Mark
  • Bouzidi, Laziz
  • Narine, Suresh S.

Abstract

The phase behavior of a model binary system made of OSO (2-stearoyl diolein) and MeS (methyl stearate) was investigated with differential scanning calorimetry and X-ray diffraction. The study is part of a series of investigations of unconventional additives such as TAGs (triacylglycerols) and dimers of TAGs with a demonstrated potential to significantly alter the crystallization of biodiesel. The TAG (triacylglycerol) was found to be effective in depressing the crystallization onset of the FAME (fatty acid methyl ester) significantly even at low concentration. OSO was shown to affect the crystallization of the mixtures strongly, and to dramatically alter their polymorphism. The system's phase diagram involved marked transformation lines including eutectics and solid–solid transitions. The molecular interactions were evaluated using a simple thermodynamic model. A mechanism for disruption of crystallization was proposed to be dependent on the peculiar geometry of OSO: the “straight” stearic acid participates easily in the lamellar packing of the equally “straight” FAME, whilst its kinked oleic acids effectively halt additional saturated FAMEs from participating due to steric hindrances. The findings of the study indicate that judicious loadings of TAGs which would target biodiesel's saturated FAMEs will have a substantial beneficial effect on the low temperature performance of the fuel.

Suggested Citation

  • Baker, Mark & Bouzidi, Laziz & Narine, Suresh S., 2015. "Mitigating crystallization of saturated FAMEs (fatty acid methyl esters) in biodiesel: 2. The phase behavior of 2-stearoyl diolein–methyl stearate binary system," Energy, Elsevier, vol. 83(C), pages 647-657.
    • Handle: RePEc:eee:energy:v:83:y:2015:i:c:p:647-657
    DOI: 10.1016/j.energy.2015.02.076
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    References listed on IDEAS

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    1. Misra, R.D. & Murthy, M.S., 2011. "Blending of additives with biodiesels to improve the cold flow properties, combustion and emission performance in a compression ignition engine--A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(5), pages 2413-2422, June.
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    1. Mohanan, Athira & Bouzidi, Laziz & Narine, Suresh S., 2017. "Harnessing the synergies between lipid-based crystallization modifiers and a polymer pour point depressant to improve pour point of biodiesel," Energy, Elsevier, vol. 120(C), pages 895-906.
    2. Mohanan, Athira & Bouzidi, Laziz & Narine, Suresh S., 2016. "Mitigating crystallization of saturated FAMEs in biodiesel 6: The binary phase behavior of 1, 2-dioleoyl-3-stearoyl sn-glycerol – Methyl stearate," Energy, Elsevier, vol. 100(C), pages 273-284.

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