Suwari1, Herry Z. Kotta2, and Yohanes Buang1
1Chemistry Department and 2Mining Department, Faculty of Sciences and Engineering, Nusa Cendana University Jl. Adisucipto Kampus Baru Penfui, Kupang, INDONESIA
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The seed kernels of Feunkase (Thevetia peruviana) was extracted with n-hexane and methanol mixture in a soxhlet extractor. The optimum condition for extraction of the crop oil from the seed kernel of Feunkase using conventional soxhlet technique was studied. Solvent used was n-hexane and n-hexane – methanol binary solvent. The parameters investigated effecting the oil yield involved various solvent polarities, extraction time and temperature. Each experiment was conducted in 250 cm3 soxhlet apparatus. The extracted oil was analyzed to examine the physicochemical characteristic, included: density, kinematic viscosity, acid value, iodine value, saponification value, and water content. The optimum conditions were found after 4.0 h extraction time, extraction temperature of 70 oC and n-hexane – methanol ratio of 50:50 (polarity index 3.30). The oil extract was found to be 46.84 ± 0.26%. The physicochemical properties of the extracted oil were density of 785 (kg/m3), viscosity of 0.68 (mm2/s), iodine value of 41.11 (g I2/100 g oil), acid value of 0.09 (mg KOH/g oil), saponification value of 108.4 (mg KOH/g oil) and water content of 0.034 (%). These results revealed that the crop oil from seed kernel Feunkase is a potential feedstock for biodiesel production.