Crystallization Behavior of Fatty Acid Methyl Esters View Full Text


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Article Info

DATE

2008-10

AUTHORS

Robert O. Dunn

ABSTRACT

Biodiesel from most agricultural feedstocks has flow properties that are prone to startup and operability problems during cold weather. Biodiesel from soybean oil is generally a mixture of long-chain fatty acid alkyl esters composed of 0.15–0.20 mass fraction saturated esters (melting point [MP] ≫ 0 °C) mixed with unsaturated esters (MP < 0 °C). This work investigates the crystallization properties of two saturated fatty acid methyl esters (FAME) commonly found in biodiesel from soybean oil. Differential scanning calorimetry (DSC) heating and cooling scans of methyl palmitate (MeC16), methyl stearate (MeC18) and methyl oleate (MeC18:1) in pure form were analyzed. Crystallization behavior in ternary FAME mixtures was inferred by the application of thermodynamic models based on ideal solution and freezing-point depression theories. Activity coefficients for MeC16 and MeC18 in MeC18:1 solvent were determined by analyzing DSC cooling curves for binary FAME mixtures. Eutectic points were predicted by both models. Crystallization onset temperatures inferred from freezing point depression theory were more accurate than those for ideal solutions with respect to a direct DSC cooling curve analysis of corresponding ternary mixtures. This work shows that the crystallization onset temperature (cloud point) of biodiesel may be predicted by freezing-point depression theory if the activity coefficients of the component FAME are known. More... »

PAGES

961-972

References to SciGraph publications

  • 1997-08. Low-temperature properties of alkyl esters of tallow and grease in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1996-05. Reducing the crystallization temperature of biodiesel by winterizing methyl soyate in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 1996-12. Improving the low-temperature properties of alternative diesel fuels: Vegetable oil-derived methyl esters in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
  • 2000-03. Crystallization kinetics of palm stearin in blends with sesame seed oil in JOURNAL OF THE AMERICAN OIL CHEMISTS' SOCIETY
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    http://scigraph.springernature.com/pub.10.1007/s11746-008-1279-x

    DOI

    http://dx.doi.org/10.1007/s11746-008-1279-x

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    https://app.dimensions.ai/details/publication/pub.1047080402


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