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In this study, the effects of ethanolic KOH concentration, reaction temperature, and reaction time to free fatty acid (FFA) percentage were investigated. D-optimal design was employed to study significance of these factors and optimum condition for the technique predicted and evaluated. The optimum conditions for maximum FFA% were achieved when 1.75 M ethanolic KOH concentration was used as the catalyst, reaction temperature of 65°C, and reaction time of 2.0 h. This study showed that ethanolic KOH concentration was significant variable for saponification ofJ. curcasseed oil. In an 18-point experimental design, percentage of FFA for saponification ofJ. curcasseed oil can be raised from 1.89% to 102.2%.
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Salimon et al. (2012) studied this question.
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