Table 6. Optimization Criteria and Validation Results at the Optimum Conditions.

name	goal	limit		predicted value	experimental value
		lower	upper		run 1	run 2	run 3
temperature,°C	in range	55	75	61.87	61 ± 2	61 ± 2	61 ± 2
methanol:oil molar ratio	in range	10	30	23.94	23.94	23.94	23.94
catalyst amount, wt %	in range	3	9	6.33	6.33	6.33	6.33
FAME yield, %	maximize	40.86	78.92	81.06	79.96	80.44	79.72
average yield					80.04