B. Ghobadian - Department of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Tehran, Islamic Republic of Iran.
H. Rahimi - Mega Motor Co., Tehran, Islamic Republic of Iran.
T. Tavakkoli Hashjin - Department of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Tehran, Islamic Republic of Iran.
M. Khatamifar - Department of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Tehran, Islamic Republic of Iran.

Biofuels are the main substitute to fossil fuels. These fuels are less polluting in compari-son to fossil fuels and can be produced from agricultural material residues for use in die-sel engines. In this research work bioethanol was produced from potato waste. It was de-hydrated in a vapor phase using ۳A zeolite and was used in combination with sunflower methyl ester oil and diesel fuel blending which was evaluated thereafter. The sunflower methyl ester was also produced using a transesterification method. Considering the labo-ratory conditions and fuel stability limits to be used, the suitable blending proportion of bioethanol and diesel fuel was determined to be ۱۲ to ۸۸ and then, for maintaining fuel stability at temperatures lower than ۱۵oC, the sunflower methyl ester was added to the mixture. The pour point of the fuel and different fuel blends, the viscosity, cetane number, flash point, amount of fuel ash, sulfur content and copper corrosion were determined in the laboratory. Experiments show that ethanol plays an important role on the flash point of the blends. With the addition of ۳% bioethanol to diesel and sunflower methyl ester, the flash point was reduced to ۱۶oC. The viscosity of the blends was reduced with the in-crease in the amount of ethanol. The sulfur content of bioethanol and sunflower methyl ester is very low compared with that of diesel fuel. The sulfur content of diesel is ۵۰۰ ppm whereas that for ethanol and sunflower methyl ester is ۰ and ۱۵ ppm, respectively. The lower amount of sulfur content facilitates the use of fuel blends in diesel engines. For the ethanol and sunflower methyl ester combination, this amount is less than ۲۰ ppm.

Biodiesel, Bioethanol, Biofuel, Ediesel, Methyl Ester