biodiesel safflower oil physico-chemical properties kinematic viscosity cetane index ASTM D6751 cold flow properties

Using oilseeds with high oil content can play a major role in biodiesel production. In this study, safflower oilseed (Isfahan cultivar) was evaluated and experimented as a biodiesel production feedstock because of its high oil content (30%). The results showed that the kinematic viscosity (4.27 mm²/s) of the produced biodiesel from safflower oil was in the approved range of D6751 ASTM standard. It was also close to the viscosity of soybean methyl ester, but it was better than palm. Its flash point (173˚C) was higher than petroleum diesel and the range of ASTM D6751 standard. In addition, its cold flow properties were similar to soybean methyl ester and better than palm. The cetane index of the produced fuel was lower than the cetane index of palm oil methyl ester, but it was nearly as high as the cetane index of soybean methyl ester. The distillation range of the produced fuel was 303.4-391.2 ˚C.

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