Reducing the crystallization temperature of biodiesel by winterizing methyl soyate
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 WordsBiodiesel crystallization differential scanning calorimetry low-palmitate soybean oil methyl soyate soydiesel winterization
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