Reducing the crystallization temperature of biodiesel by winterizing methyl soyate

  • Inmok Lee
  • Lawrence A. Johnson
  • Earl G. Hammond
Article

Abstract

Methyl soyate, made from typical soybean varieties, has a crystallization onset temperature (T co) of 3.7°C and, as a biodiesel fuel, is prone to crystallization of its high-melting saturated methyl esters at cold operating temperatures. Removal of saturated esters by winterization was assessed as a means of reducing theT co of methyl soyate. Winterizing neat methyl esters of typical soybean oil produced aT co of −7.1°C, but this was not an efficient way of removing saturated methyl esters because of the low yield (26%) of the separated liquid fraction. However, aT co of −6.5°C with 86% yield was obtained by winterizing the neat methyl esters of a low-palmitate soybean oil; aT co of −5.8°C with 77% yield was obtained by winterizing methyl esters of normal soybean oil diluted with hexane.

Key Words

Biodiesel crystallization differential scanning calorimetry low-palmitate soybean oil methyl soyate soydiesel winterization 

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Copyright information

© AOCS Press 1996

Authors and Affiliations

  • Inmok Lee
    • 1
  • Lawrence A. Johnson
    • 1
  • Earl G. Hammond
    • 1
  1. 1.Center for Crops Utilization Research and Department of Food Science and Human NutritionIowa State UniversityAmes

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