3-7-2 バイオディーゼルの低温特性に及ぼすジグリセリドの影響

抄録

Biodiesel generally refers to a mixture of fatty acid methyl esters (FAMEs). Solid precipitates are occasionally generated in biodiesel due to the presence of minor components, such as monoglycerides (MGs) and diglycerides (DGs). The effect of diglycerides to biodiesel cold flow properties was studied in the current study. Binary mixtures of FAME-DG and MG-DG and multi-component mixtures of FAME-DG-MG were prepared, and the melting temperature was measured by DSC. Two prediction models (ideal liquid and non-ideal liquid models) were then applied to the experimental result. It was found that the binary mixtures with DG followed the non-ideal liquid model. Deviations from the model were found only when the concentration of MG was low, or when MG was the first solidified component, which was likely due to the polymorphism of MG. Hence, DGs did not critically affect the cold flow properties of biodiesel, while MGs were critical for the solidification.