Taguchi optimization method is highly significant as a statistical design of experiments that provides a systematic framework to evaluate multiple variables simultaneously with minimal experimental trials 23 .
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A non-conventional biodiesel process route from waste palm fatty acid distillate and ethyl acetate via esterification.
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The plot illustrates an increasing trend in FFA conversion as time and ethyl acetate to PFAD molar ratio increases, it suggests that longer reaction times and ethyl acetate to PFAD molar ratio favor higher conversion but ethyl acetate to PFAD molar ratio had the highest influence which indicates that a larger excess of ethyl acetate improves FFA conversion.