Fig. 10
From: Valorization of marble sludge waste in biodiesel production using a central composite design
Contributions of the interaction of reaction time (A)-reaction temperature (B), reaction time (A)-methanol to oil molar ratio (C), reaction time (A)-catalyst concentration (D), reaction temperature (B)-methanol to oil molar ratio (C), reaction temperature (B)-catalyst concentration (D) and methanol to oil molar ratio (C)-catalyst concentration (D).
