Abstract
Swietenia mahagoni seed oil contains common unsaturated fatty acids such as oleic (25.5%), linoleic (32.6%), linolenic (12.2%) and saturated fatty acids, namely, palmitic (13.0%) and stearic (14.1%) as major fatty acids with 58.1% oil content. In the present study, the oil with 1.39% free fatty acids was converted into biodiesel employing conventional acid-catalyzed esterification followed by base-catalyzed transesterification reaction. The resultant biodiesel was evaluated for physico-chemical properties namely iodine value (104.6), free fatty acids (0.05%), phosphorous content (0ppm), flash point (165.0°C), cloud point (7°C), pour point (9°C), viscosity at 40°C (4.13 cSt), oxidative stability at 110°C (3.7h), density (0.880g/cm3 at 15°C), and trace metals (Group I metals, 0.5ppm). The physico-chemical properties were found to be within the range of ASTM and almost falling in the range of EN biodiesel specifications.
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