Abstract
Currently, biodiesel is produced from non-edible oils, which have various poisonous and un-saponifiable components; therefore, it is harmful and unfit for humans. Biodiesel replaces petro-diesel fuel, which can be used as additives or substitutes for diesel engines. The novelty of the present study is to optimize the process parameters of a two-step (esterification and transesterification) process for biodiesel production using high free fatty acid (FFA) containing Karanja oil (Pongamia pinnata oil), with the ultrasound (US) process intensification (PI) technique, which is carried out for the first time. In the first step, a reduction in the initial FFA concentration of 11.06% was achieved through optimization of the esterification process using response surface methodology (RSM)-supported central composite design (CCD) method in which methanol:oil molar ratio of 6:1 and 60 °C reaction temperature kept as fixed parameter, whereas H2SO4 catalyst loading (0.5–1.5 w/w%) and reaction time (15–45 min.) were varied. The FFA value is reduced to 1.56% under the optimal condition (32.8 min reaction time and 1.14 w/w% of catalyst loading). The second step of optimization of the transesterification of esterified oil was performed by applying RSM supported Box-Behnken design (BBD) method with varying independent parameter ranges such as the molar ratio (A), CH3OK catalyst loading (B), and reaction time (C) with the range of 6:1–9:1 (methanol: oil), 0.5–1.5 w/w%, and 10–30 min., respectively. A biodiesel yield of 98.16% was obtained under optimal conditions of a molar ratio of 7.6:1, catalyst loading of 0.98 w/w%, a reaction time of 20.6 min., and a reaction temperature of 60 °C (constant). Superior optimization results were observed than the conventional stirring method. The biodiesel’s estimated characteristics were discovered to be within ASTM criteria and suitable for blending with diesel fuel.
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The Centre for Biofuels and Bioenergy Studies (CBBS) in PDEU provided laboratory facilities for this project.
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The authors received funding from the Gujarat Energy Development Agency (GEDA), Gujarat, India.
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All authors contributed to the study’s conception and design. Material preparation, data collection, software development, validation, investigation, original draft writing, and analysis were performed by Suvik Oza and Harshil Thakar. Pravin Kodgire and Surendra Singh Kachhwaha were responsible for conceptualization, providing resources, reviewing and editing the manuscript, creating visualizations, supervising the project, and acquiring funding.
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Oza, S., Thakar, H., Kodgire, P. et al. Utilizing an ultra-sonication process to optimize a two-step biodiesel production from Karanja oil. Environ Sci Pollut Res (2023). https://doi.org/10.1007/s11356-023-28711-6
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DOI: https://doi.org/10.1007/s11356-023-28711-6