Abstract:
The objective of this research was to produce biodiesel from trapped grease. Greased was
collected from the grease trap of the central canteen of Mahidol University, Salaya Campus, and then
passed through the extraction unit to extract the unwanted matters. This product was able to be
transformed into ethyl ester, biodiesel, by using the transesterification reaction, in the present of acidic
catalyst of concentrated sulfuric acid. The 100% access ethanol was involved to accomplish the
reaction by the molecular ratio of 30:1 between ethanol and grease. At 90 oC for 90 minutes, the
finished process provided the biodiesel of 95.17% by volume.
The results indicated that biodiesel had API gravity value at 15oC of 0.90 g/cm3, viscosity
value at 40oC of 8.69 mm2/s, flash point value of 184oC, and heat value of 9,685.35 Cal/g. After
blending, to local diesel, the property test shown that there were no statistical differences between the
blends and baseline diesel at the significant of 0.01 level.
With testing engine performance, the reported graph of torque and power exhibited that the
blends seemed to be slightly higher than diesel. Moreover, the entire results of correlation value of
every samples graph were in range of 0.97 0.99 which could be declared that the blends were
replaceable to diesel in every ratio.
According to the results of those fuel specific properties and engine performance tests, it can
statistically concluded that canteens trap grease was able to be transformed to ethyl ester, biodiesel,
and every ratio of diesel/biodiesel blend had the potentiality to substitute to diesel. Yet, there were little
differences investigated among the blends which could be supported that the most suitable blend which
had the best performance compared to diesel was B15.