Response surface methodological approach to optimize the operational parameters extraction yield of Moroccan oil shale by olive oil mill wastewater

A. Chham, E. khouya, M. Oumam, A. K. Abourriche, S. Gmouh, N. Rhazi, S. Mansouri, M. El bouchti, N. El Hammoudi, H. Hannache

Abstract


In order to optimize the factors affecting the extraction of Moroccan oil shale of Timahdit area (Y layer) by sub-critical water extraction, we conducted a study by response surface design type faced central composite design (FCCD). The treatment of the results for experimental designs was carried out using software of experimental design JMP 10. After an appropriate choice of three variables, 20 experiments led to a mathematical second degree model relating the response function (extraction yield) to factors and allowing a good control of the extraction process. Our study proved the great efficiency to applying the experiments design methodology for optimizing the operational parameters affecting the sub-critical water extraction of Moroccan shale oil. The modeling extraction process create a mathematical model between extraction conditions (factors studied) and the response measured (propriety searched). The ANOVA test was used to identify the significant factors. Later than the realization of the experiments and data analysis, the study has allowed the knowledge of the optimal conditions necessary to obtain a better essential oil yield about 95.52%. The optimized parameters are: operating temperature of 315.1 °C, an extraction time of 117.4 min and 55.6 g of olive oil mill wastewater with 50 g of oil shale. It is about a relevant and economical way which allows obtaining the maximum of information in a short time with a minimum of experiments. However for a sustainable environment and to try to address environmental issues, we could develop these effluents (liquid wastes) as extraction solvent of Moroccan oil shale.


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