Fatty acid ethyl ester from Manilkara zapota seed oil: a completely renewable biofuel for sustainable development
2021
Rajamanickam, Sathish Kumar | Kasinathan, Sureshkumar
This article reports the deliverables of the experimental study on the production of a completely renewable biofuel from Manilkara zapota fruit and seed oil. It was attempted to synthesis ethyl ester from Manilkara zapota seed oil using bioethanol synthesized from decayed Manilkara zapota fruit. Bioethanol was produced through fermentation of decayed Manilkara zapota fruit, waste skin, and pulp with Saccharomyces cerevisiae and then distilled at 72°C. The bioethanol yield was noted as 10.45% (v/w). The 95.09% pure bioethanol and 4.9% water molecules were present in the distilled sample. Mechanically extracted raw Manilkara zapota seed oil was used for ethyl ester conversion. The molar ratio of bioethanol to oil, the quantity of KOH, and process temperature were investigated for the maximum yield of Manilkara zapota ethyl ester. A 9:1 molar ratio of bioethanol to oil, 1.5% (w/w) KOH, and 70°C process temperature were identified as enhanced ethanolysis process parameters. The maximum yield of ethyl ester was identified as 93.1%. Physicochemical characteristics of Manilkara zapota oil, bioethanol, and ethyl ester were measured as per the corresponding ASTM standards. It was found that both Manilkara Zapota ethyl ester and bioethanol synthesized from decayed Manilkara zapota fruit could be promising substitutes for fossil diesel and gasoline.
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