<p>Fatty acid methyl ester is being used as biodiesel, which is produced by transesterification of plant oils with methanol. However, biodiesel often contains a small amount of monoglycerides as intermediate compounds, which have higher melting points than their methyl esters. Such monoglycerides usually solidify at low temperatures, plugging the fuel filter. In this study, therefore, a prediction of the solidification temperature was discussed based on the solid-liquid equilibria in binary mixtures of various fatty acid methyl esters and monoglycerides. The solidification temperature and molar enthalpy of melting were measured by differential scanning calorimetry (DSC). On the other hand, the theoretical values were calculated by using the modified UNIFAC (Dortmund) model. As a result, the theoretical and experimental results were consistently found in a good agreement each other.</p>