Browsing by Author "Ajala, M.A."
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Item Optimization of a two stage process for biodiesel production from shea butter using response surface methodology(Egyptian Journal of Petroleum, 2017-12) Ajala, E.O.; Aberuagba, F.; Olaniyan, A.M.; Ajala, M.A.; Sunmonu, M.O.The challenges of biodiesel production from high free fatty acid (FFA) shea butter (SB) necessitated this study. The reduction of %FFA of SB by esterification and its subsequent utilization by transesterification for biodiesel production in a two stage process for optimization studies was investigated using response surface methodology based on a central composite design (CCD). Four operating conditions were investigated to reduce the %FFA of SB and increase the %yield of shea biodiesel (SBD). The operating conditions were temperature (40–60°C), agitation speed (200–1400 rpm), methanol (MeOH): oil mole ratio: 2:1–6:1 (w/w) for esterification and 4:1–8:1 (w/w) for transesterification and catalyst loading: 1–2% (H2SO4, (v/v) for esterification and KOH, (w/w) for transesterification. The significance of the parameters obtained in linear and non-linear form from the models were determined using analysis of variance (ANOVA). The optimal operating conditions that gave minimum FFA of 0.26% were 52.19°C, 200 rpm, 2:1 (w/w) and 1.5% (v/v), while those that gave maximum yield of 92.16% SBD were 40°C, 800 rpm, 7:1 (w/w) and 1% (w/w). The p-value of <0.0001 for each of the stages showed that the models were significant with R2 of 0.96 each. These results indicate the reproducibility of the models and showed that the RSM is suitable to optimize the esterification and transesterification of SB for SBD production. Therefore, RSM is a useful tool that can be employed in industrial scale production of SBD from high FFA SB.Item Optimization of a two-stage process for biodiesel production from shea butter using Response Surface Methodology(Egyptian Journal of Petroleum (EGYJP). Published by Elsevier. doi: 10.1016/j.ejpe.2016.11.005, 2017) Ajala, E.O.; Aberuagba, F.; Olaniyan, A.M.; Ajala, M.A.; Sunmonu, M.O.The challenges of biodiesel production from high free fatty acid (FFA) shea butter (SB) necessitated this study. The reduction of %FFA of SB by esterification and its subsequent utilization by transesterification for biodiesel production in a two stage process for optimization studies was investigated using response surface methodology based on a central composite design (CCD). Four operating conditions were investigated to reduce the %FFA of SB and increase the %yield of shea biodiesel (SBD). The operating conditions were temperature (40–60 C), agitation speed (200– 1400 rpm), methanol (MeOH): oil mole ratio: 2:1–6:1 (w/w) for esterification and 4:1–8:1 (w/w) for transesterification and catalyst loading: 1–2% (H2SO4, (v/v) for esterification and KOH, (w/w) for transesterification. The significance of the parameters obtained in linear and non-linear form from the models were determined using analysis of variance (ANOVA). The optimal operating conditions that gave minimum FFA of 0.26% were 52.19 C, 200 rpm, 2:1 (w/w) and 1.5% (v/v), while those that gave maximum yield of 92.16% SBD were 40 C, 800 rpm, 7:1 (w/w) and 1% (w/w). The p-value of <0.0001 for each of the stages showed that the models were significant with R2 of 0.96 each. These results indicate the reproducibility of the models and showed that the RSM is suitable to optimize the esterification and transesterification of SB for SBD production. Therefore, RSM is a useful tool that can be employed in industrial scale production of SBD from high FFA SB.Item Thermal modification of chicken eggshell as heterogeneous catalyst for palm kernel biodiesel production in an optimization process(Springer Berlin Heidelberg, 2020-02-04) Ajala, E.O.; Ajala, M.A.; Odetoye, T.E.; Aderibigbe, F.; Osanyinpeju, H; Ayanshola, A.M.Synthesis of the heterogeneous chicken eggshell catalyst (CEC) using thermal treatment at temperatures of 800 °C (CEC800) and 900 °C (CEC900) for palm kernel biodiesel (PBD) production was undertaken. The morphology, chemical composition, and surface area of the catalysts were determined. Catalyst’s efficiency in the production of biodiesel frompalmkernel oil was studied using a definitive screening design of optimization technique. The optimization parameters investigated were calcination temperature, catalyst quantity, methanol:oil molar ratio, and reaction time. The stability of the catalyst after the 5th cycle of repeated usage was studied. The CEC900 contained the highest chemical composition of 32.36% (wt) calcium with the morphology of highly porous, uniformly distributed spherical shape, with no agglomeration.A surface area of 120.4m2/g and a smaller pore size of 1.324 nmwere obtained fromthe CEC900. The optimal operating parameters of 4% (w/w) catalyst quantity, 10:1 methanol:oil molar ratio, 50 °C reaction temperature, 1 h reaction time, and 900 °C calcination temperature were obtained to yield optimum biodiesel of 97.10%. Qualitative characterization confirmed that the CEC900 is suitable to produce quality PBD of ASTM standard. Reduction in the catalytic activity of 6% PBD was noticed in the 5th cycle. Therefore, thermal-modified CEC is a suitable and low-cost catalyst for biodiesel production.