Boiling point distributions of WFG, WFG esters, diesel fuel and kerosene base fuel are shown in Fig. 5. Waste fryer grease (WFG) showed higher boiling points than its esters, i.e., waste fryer grease methyl ester (WME), waste fryer grease ethyl ester (WEE), and waste fryer grease methyl–ethyl ester {WMEE(3:3)}. This can be interpreted as the fact that large molecules,such as acylglycerols and polymerized materials present in WFG got converted into smaller molecules, i.e. esters after transesterification. boiling point distributions of all the esters were approximately the same. Diesel fuel and kerosene were more volatile than WFG esters and boiling point of base fuel kerosene was much lower than that of the diesel fuel. But at 90% off the boiling points of WFG esters matched with that of
diesel fuel.