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Table 1 Range and level of the variables based on the parametric study

From: Response surface optimization of biodiesel yield from pre-treated waste oil of rendered pork from a food processing industry

Independent variableCoded level
− 2− 1012
Methanol–oil ratio (mol)23456
Amount of catalyst (wt%)0.250.500.751.001.25
Reaction time (min)3045607590