Abstract
This study aimed to optimize the process parameters and evaluated economic feasibility for biodiesel production. A pyrolytic rice straw ash (RSA) support with various amounts of calcium oxide (25–35 wt%) and calcination temperatures (600–800 °C) were used in the study. The results identified 35 wt% of CaO/RSA and calcination at 600 °C as the most effective catalyst with turnover frequency (TOF) of 2.88 h−1 for biodiesel synthesis, giving a biodiesel yield of 96.49%. The optimal conditions for biodiesel production included a methanol: palm oil molar ratio of 9.34:1, a catalyst loading of 4.87 wt%, 175 min reaction time, and 65 °C reaction temperature. The study also included a techno-economic analysis of biodiesel production, revealing a payback period of 7.17 years, an internal rate of return of 17.20%, and a net present value of 4,151,905.61 USD. These findings pave the way for more sustainable and economically feasible biodiesel production.
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