Development of a Model for Predicting the Yield of Biodiesel During Biodiesel Production

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E. I. Bello
I. A. Daniyan
T. I Ogedengbe
L. Lajide
P. B. Mogaji


The production of methyl esters using vegetable oil or animal fat requires selective catalysis and controlled process conditions to meet biodiesel specifications and optimum yield. In this work, a suitable model for the optimization of biodiesel yield as a function of five independent process parameters namely: reaction time, reaction temperature, stir speed, catalyst concentration and methanol-oil ratio was developed using the central composite design and response surface methodology. Alkali transesterification was used for the conversion of palm olein virgin oil to biodiesel with 99.8% pure methanol and sodium hydroxide (NaOH) as catalyst, methanol being in excess to oil ratio (4: I to 9:1). The designed experiment was carried out using a four-level-five factor central composite design model and response surface methodology to study the interaction of the independent variables; reaction time (1-5 hours), temperature (40- 90oC), stir speed (200-400 rpm), catalyst concentration (1-2 wt%) and methanol-oil ratio (4: I to 9: I) on the biodiesel yield with the response in terms of percentage yield. A predictive model was formulated which correlates the yield of biodiesel to the five process variables. The regression model was found to be highly significant at 9 5% confidence level as correlation coefficient R (0.985), R-Squared (0.9700), adjusted R-Squared (0.9686) and predicted R-Squared (0.9653) was very close to 1. This is an indication that very small deviation exists between the experimental and predicted values. Results obtained from the model output was in good agreement with experimental values hence the developed model can be employed to predict the yield of biodiesel.

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Author Biography

I. A. Daniyan, Department of Mechanical & Mechatronics Engineering, Afe Babalola University, Ado-Ekiti, Nigeria

Department of Mechanical & Mechatronics Engineering, Afe Babalola University, Ado-Ekiti, Nigeria


Al-Zuhair, S., Dowaidar, A. and Kamal, H. (2010). Dynamic Modelling of Biodiesel Production from Simulated Waste Cooking Oil Using Immobilized Lipase. Biochemical Engineering Journal, 44 (2-3): 256-262.

Apostolaku, A. A., Kookos, I. K., Marazioti, C., and Angelopoulos, K. C. (2009). Techno-economic Analysis of a Biodiesel Production Process from Vegetable Oils. Fuel Process. Technol. 90 (2009): 1026-1030.

Bello, E. I., Ogedengbe, T. I., Lajide, L. and Daniyan, I. A. (2016). Optimization of Process Parameters for Biodiesel Production. American Journal of Energy Engineering. 4(2):8-16.

Bello, E. I., Daniyan, I. A., Akinola A. 0, and Ogedengbe, T. I. (2013). Development of a Biodiesel Processor. Research Journal in Engineering and Applied Sciences. 2(13): 182-186

Collusi, J. A., Borrero, E. E. and Alape, F. (2005). Biodiesel from an Alkaline Transesterification Reaction of Soybean Oil Using Ultrasonic Mixing. Journal of American Oil Chemist Society 82(7) 525-530.

Daramola, M. 0, Mtshali, K. Senokome, L. and Fayemiwo, 0. M. (2015). Influence of Operating Variables on the Transesterification of Waste Cooking Oil to Biodiesel over Sodium Silicate Catalyst: A Statistical Approach. Journal of Taibah University for Science. pp. 1-10.

Demirbas, A. (2010). Microalgae as Feedstock for Biodiesel: Energy Edu. Sci. Technology PartA25 (I): 31-40.

Diaz, M. S., Espinosa, S. and Brignole, E. A. (2009). Model-Based Cost Minimization in Non-Catalytic Biodiesel Production Plants. Energy and Fuels, 23:5588-5593.

Dorado, M. P., E. Ballesteros, F. J. Lopez and M. Mittelbach (2004). Optimization of Alkali-catalysed Transesterification of Brassica carinata Oil for Biodiesel Production. Energy and Fuels 18(1)77-83.

Freedman, B., Pryde, E. H. and Mounts, T. L. (1984). Variables Affecting the Yields of Fatty Esters from Transesterified Vegetable Oils. Journal of American Oil Chemical Society. 61(10): 1638-1643.

Glisic, S. and Skala, D. (2009). The Problems in Design and Detailed Analyses of Energy Consumption for Biodiesel Synthesis at Super-critical Conditions. Journal of Super­critical Fluids. 49:287-300.

Helwani, Z., Othman, M. R.,Aziz, N., Kim, J. and Fernando, W. J. N. (2009). Solid Heterogeneous Catalysts for Transesterification of Triglycerides with Methanol: a review, Appl. Catal. A-Gen. 363:1-10.

Institution of Prospective Technological Studies IPTS, (2002). "Techno-Economic Analysis of Biodiesel Production in the EU: a Short Summary for Decision Makers", Report EUR 20279 EN.

Liu, K. (1994). Preparation of Fatty Acid Methyl Esters for Gas Chromatographic Analysis of Lipids in Biological Materials. Journal of American Oil Chemist Society 71(11): 1179-1187.

Mathiyazhagan, M. and Ganapathi, A. (2011). Factors Affecting Biodiesel Production. Res. Plant Biol. I (2): 1-5

Meher, L.C., Vidya Sagar, D.; Naik, S.N. (2006). Technical Aspects of Biodiesel Production by Transesterification-a review. Renewable and Sustainable Energy Reviews, 10 (3): 248-268.

Mittelbach, M., Pokits, B. and Silberholz, A. (1994). Diesel Fuel derived from Vegetable Oils, IV: Production and Fuel Properties of Fatty Acid Methyl Esters from Used Frying Oil. Liquid Fuels from Renewable Resources, Proceedings of the Alternative Energy Conference. Michigan (USA): American Society of Agricultural Engineers. pp. 74-77.

Muazu, K., Mohammed-Dabo, I. A., Waziri, S. A., Ahmed, S. A., Bugaje, I. M. and Ahmed, A. S. (2013). Development of a Mathematical Model for the Esterification of Jatropha Curcas Seed Oil. Journal of Petroleum Technology and Alternative Fuels. 4(3):44-52.

Pokoo-Aikins, G., Nadim, A., El-Halwagi, M. M. and Mahalec, V. (2010). Design and Analysis of Biodiesel Production from Algae Grown through Carbon Sequestration 12(3):236-251.

Van Gerpen, J., Shanks B. and Pruszko, R. (2004). Biodiesel Production Technology. Renewable Energy Laboratory, IOWA State University, US. pp. 01-105.

West, A. H., Posarac, D., and Ellis, N. (2008). Assessment of Four Biodiesel Production Processes Using HYSYS. Plant Resour. Technol. 99:6589-6600.

Zhang, Y., Dube, M. A., McLean, D. D. and Kates, M. (2003a). Biodiesel Production from Waste Cooking Oil: Process Design and Technological Assessment. Bioresour. Technol., 89:3-14.

Zhang, Y., Dube, M. A., McLean, D. D. and Kates, M. (2003b). Biodiesel Production from Waste Cooking Oil: Economic Assessment and Sensitivity Analysis. Bioresour. Technol., 90:231-240.

Zhang, Y., Stanciulescu, M. and Ikura, M. (2009). Rapid Transesterification of Soybean Oil with Phase Transfer Catalysts. Applied Catalysis, A-General, 366, 1 (2009): 178-180, 0926-860X.