Response Surface Methodology for Biodiesel Production Using Calcium Methoxide Catalyst Assisted with Tetrahydrofuran as Cosolvent

Figure 5

Response surface plots elucidating the effects of (a) THF in methanol concentration and catalyst concentration; (b) reaction time and catalyst concentration; (c) THF in methanol concentration and methanol-to-oil molar ratio; (d) catalyst concentration and methanol-to-oil molar ratio; (e) THF in methanol concentration and reaction time; and (f) reaction time and methanol-to-oil molar ratio.

(a)

(b)

(c)

(d)

(e)

(f)