Abstract—An improved method for essential oil extraction was developed with the application of ohmic heated hydro distillation. In this study the parameters affecting citronella oil extraction by ohmic heated hydro distillation such as power input, extraction time, solvent to solid ratio and chopping frequency were investigated to achieve maximum oil yield. The kinetics of extraction was assumed and verified based on a second-order mechanism. The initial extraction rate, the saturated extraction capacity and the rate constant of extraction were calculated using the second-order model. The optimum parameters were found at voltage input of 77 V up to boiling point and 50 V until the end of extraction, 120 minutes extraction time, solvent to solid ratio of 3:1 and once chopping frequency. The kinetics and mechanism of ohmic heated hydro distillation of citronella oil has proved follow second-order model. The initial extraction rate (h) was 0.134 gL-1min-1; the extraction capacity (Cs) was 5.787 gL-1; the second order extraction constant (k) was 0.004 Lg-1min-1 and the coefficient of determination (R2) was 0.976.
Index Terms—Ohmic heating; hydro distillation; citronellaoil; optimization; kinetics
Muhammad Hazwan H. and Hasfalina C. M. are with Department of Biological and Agricultural Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia (e-mail:hazwan@eng.upm.edu.my; has@eng.upm.edu.my).
Hishamuddin J. is with Food Technology Section, Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology(MICET), Lot 1988, Bandar Vendor Taboh Naning, 78000 Alor Gajah, Melaka, Malaysia (e-mail: hishamuddin@micet.unikl.edu.my).
Zurina Z. A. is with Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400Serdang, Selangor, Malaysia (e-mail: zurina@eng.upm.edu.my).
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Cite: Muhammad Hazwan H., Hasfalina C. M., Hishamuddin J., and Zurina Z. A., " Optimization and Kinetics of Essential Oil Extraction from Citronella Grass by Ohmic Heated Hydro Distillation," International Journal of Chemical Engineering and Applications vol. 3, no. 3, pp. 173-177, 2012.
