EXTRACTION, CHARACTERIZATION AND KINETIC MODELS OF OILS FROM LUFFA CYLINDRICA AND HURA CREPITAN SEEDS
Present study depicts possibility of extracting oils from Hura crepitan and Luffa cylindrical seeds by soxhlet extraction process, using normal hexane as solvent at different temperature, particle size and extraction time. The oils extracted were separated from oil-solvent mixture by distillation. Physicochemical analysis of the refined oils showed saponification values of 132.45 and 290.32 mgKOH/g, acid values of 12.62 and 27.21 mg KOH/g; iodine values of 3.33 and 176.89 g/100g; viscosity (at 15 °C) of 2.43cp and 3.40cp; refractive index of 1.42 and 1.43; flash point of 128°C and 130°C; specific gravity of 0.93 and 0.94; and moisture content of 6.61% and 8.11% for Hura crepitan and Luffa cylindrical seeds respectively. These results indicated that Hura crepitan oil was highly unsaturated making it suitable for industrial applications as compared with oil from Luffa cylindrica . Maximum percent yields of oils were obtained at 60 OC, extraction time of 80 mins using 40g of grounded seeds, 0.425mm particle size and 200ml of normal hexane. The kinetics of oils extracted were derived from mass transfer rate equation and power index model and were found to fit reasonably well with the power index model kinetics with mass transfer co-efficient of 0.044min-1 for mass transfer model and 0.0736min-1 for the power index model.