Biodiesel is nontoxic and renewable fuel which used at place of diesel in CI engine without any major modification. Biodiesel had better lubrication property, less emission and clean burning as compare to diesel. In the present work, the Transesterification process was used for production of cotton seed oil methyl ester because yield and reaction type was less as compare to other biodiesel production process. Ethanol was used as oxygenated fuel that was mix in blend of cotton seed oil methyl ester and diesel. Because ethanol had high calorific value and high cetane no. ethanol would reduce the consumption of diesel, content of HC and CO in engine emission and ignition lag in CI engine. An experimental study was carried out compare the properties of blend D80-B10-E10 and D60-B20-E20 with diesel and pure biodiesel. The optimum blend was selected on the basis of properties. Results showed that the properties of blends were very near to pure diesel The properties were include density, viscosity, flash point and fire point, cloud point and pour point, carbon residue content and ash residue content and calorific value.
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