Effect of Fatty Acid Profile of Biodiesel on Adiabatic Compressibility and Viscosity of Biodiesel and Blends (original) (raw)
Biodiesel is an alternative environmental friendly fuel to Petroleum Diesel (PD). In this work, adiabatic compressibility and viscosity of Cotton Seed Oil Methyl Esters (CSOME) and Palm Stearin Methyl Esters (PSME) biodiesels and their blends with PD were investigated as a function of fatty acid profile of biodiesels. Adiabatic compressibility was measured using ultrasonic interferometer of frequency 2 MHz. Viscosity was measured using capillary flow technique. The fatty acid profile was measured using Gas Chromatography (GC) method with Flame Ionization Detector (FID). CSOME biodiesel was rich in unsaturated Fatty Acid Methyl Esters (FAME) and PSME biodiesel in saturated FAME. Adiabatic compressibility decreased linearly in similar fashion at different rates with increase in blend percent of both biodiesels with PD. Viscosity was increased non linearly in similar fashion for both the biodiesel blends with increase in blend percent of biodiesel in PD. Adiabatic compressibility and viscosity were constant in the lower blends irrespective of FAME composition of biodiesels. Significant difference in adiabatic compressibility and viscosity was observed for pure biodiesels. The physical properties, adiabatic compressibility and viscosity were changed in the similar fashion with small difference in values even though having significant structural difference between saturated and unsaturated FAME.
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