Mango Seeds Oil Extraction: Effects of Operating Variables, Kinetics and Thermodynamics Studies
Authors: Osagiede CA, Akerele OO, Ogbeide SE, Onaifo JO
Kinetics and thermodynamics aspect of the extraction of oil from mango seeds using n-hexane as the extraction solvent were investigated in this study. The individual effects of operating variables such as temperature, extraction time, particle size and amount of solvent on the oil yield were also investigated. The actual experimental data obtained from the oil extraction process were analysed to ascertain the relative oil yields. The mass transfer kinetics power model and the laws of thermodynamics were applied to describe the kinetics and the thermodynamic parameters of the extraction process respectively. Maximum oil yield of 12.15 % was obtained at 80 oC for an extraction time of 210 minutes using 15 g of dried mango seeds of size 0.353 mm and 50 ml of n-hexane. Analysis of the experimental data showed that the extraction followed first-order kinetics with a rate constant largely influenced by temperature. The activation energy (Ea), enthalpy change (?H) and entropy change (?S) were estimated to be 45.640 kJ/mol, 32.781 kJ/mol and 0.109 kJ/mol respectively with negative values of Gibbs’ free energy change ?G at each prevailing temperature value. The positive value of enthalpy showed that mango seeds oil extraction process is endothermic and therefore required energy input.
Affiliations: Department of Chemical Engineering, Faculty of Engineering, University of Benin, Benin City, Nigeria.
Keywords: Extraction, Kinetics, Thermodynamics, Mango Seeds, Temperature
Published date: 2019/06/30