Nonlinear Kinetics, Thermodynamics, and parametric studies of Colocynthis vulgaris Shrad seeds oil extraction

• Published in: Industrial crops and products Vol. 123; pp. 386 - 400
• Main Authors: Agu, Chinedu M., Kadurumba, Chukwuma H., Agulanna, Albert C., Aneke, Ozioma O., Agu, Ijeoma E., Eneh, Joy N.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2018
• Subjects: Colocynthis vulgaris shrad; Kinetics; Nonlinear models; Thermodynamics; Thermodynamics; Nonlinear models; Kinetics; Colocynthis vulgaris shrad
• ISSN: 0926-6690; 1872-633X
• DOI: 10.1016/j.indcrop.2018.06.074

•The temperature and time increment increases the oil yield of Colocynthis vulgaris Shrad (CVSS), while the highest oil yield was obtained with the smallest particle size.•The evaluated physicochemical characteristics of CVSS oil indicated its potential industrial application; however, the fatty acid composition of the oil indicated that the oil was highly unsaturated.•For all the models evaluated, parabolic diffusion, hyperbolic, Elovich’s and pseudo second order models, gave good fit to the experimentally obtained kinetic data.•The obtained values of the thermodynamic parameters of ΔG, ΔS, and ΔH, indicated that the extraction process was spontaneous, irreversible, and endothermic, respectively. Nonlinear kinetics and thermodynamics of Colocynthis vulgaris Shrad Seeds oil (CVSSO) extraction were investigated using solvent extraction method. Parabolic diffusion, power law, hyperbolic, Elovich’s, and pseudo second order models were the models studied. Seed average particle size, time and temperature were the considered process variables. Highest oil yield of 53.86% (by weight) was obtained at 55 °C, 0.5 mm and 150 min, while its physicochemical properties indicated its potential industrial utilization. In ascending order, the best fitted models are parabolic, Elovich’s, pseudo second order and Hyperbolic (average R2, RMS, SEE, ARE%, SSE, HYBRID%, MPSED% and SD: 0.9962, 0.02735, 0.3599, 1.7274, 4.1623, 2.879, 2.0386 and 0.0378). However, power law model failed to give adequate fitting to the experimental data. ΔH, ΔS and ΔG values of CVSSO extraction obtained at 0.5 mm and 328 K were 333.40 KJ/mol, 1.22 KJ/mol and - 64.82 KJ/mol, respectively, indicating endothermic, irreversible and spontaneous process.