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Fuzzy Optimization of the Esterification Conditions in Biodiesel Production using Karanja Oil as Feedstock

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Thesis Archive

Fuzzy Optimization of the Esterification Conditions in Biodiesel Production using Karanja Oil as Feedstock

Cassandra Q. Buenviaje
Darwin Tyson H. Cua
Maria Patricia Isabel P. Pascual
Caitlyn Danielle O. See

Abstract:

Current biodiesel production remains unsustainable and costly because of the use of refined edible oils as feedstock. The use of non-edible oils such as Karanja oil would contribute to making biodiesel production more economically competitive because of its availability and low cost. Many studies have performed optimization techniques on biodiesel production which only includes local optimization of operating variables without consideration of cost. This paper performs a case study on the esterification conditions in biodiesel production from Karanja oil which utilizes fuzzy optimization in the multi-objective decision-making process to determine optimized values for the conversion of the free fatty acid (FFA) content in Karanja oil with its cumulative uncertainty error (YQ) and its corresponding total operating cost (CT). This paper also incorporates cumulative uncertainty into the variables and an operating cost equation which are both essential in studying the economic feasibility of the process. The operating variables include the methanol-to-oil ratio, catalyst loading, reaction time, and duty cycle. The Pareto front was generated from the objective functions to determine the boundary limits for YQ and CT. Results indicated an overall satisfaction level of 64.68% for conversion and cost. The optimal conditions of the variables were 5:1 for molar ratio, 0.85 wt% for catalyst loading, 79% for duty cycle, and 89.35 min for reaction time. These conditions yielded a YQ of 68% and a total operating cost of USD 0.12 per liter of Karanja oil esterified. Comparison with previous literature showed a conversion that was 13.51% lower but at a cost that was 24.86% cheaper.

 

Adviser:

Choi, Angelo Earvin S.

Tapia John Frederick D.

[email protected]

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