Independent Variable Range and Level -α -1 0  1 α Temperature (Celsius) (A) 220 230 240 250 260 Time (Minutes) (B) 30 60 90 120 150 Molar Ratio (C) 0.1:1 0.2:1 0.3:1 0.4:1 0.5:1 Catalyst Concentration (wt%)(D) 0.02 0.04 0.06 0.08 0.10

Table 1: Formulation of coded variables for experimental analysis