Table 3: Central composite design arrangement and results for transesterification of soybean oil using dolomite calcined at 800°C and a reaction time of 4 h.

Run Independent variablesFAME yield (wt%)
(°C) (wt%)

15560.685.5
26560.689.9
355150.693.6
465150.696.1
55562.092.6
66562.091.6
755152.093.2
865152.094.3
96010.50.693.7
106010.52.095.0
1160151.394.4
126061.389.3
136510.51.394.6
145510.51.395.6
156010.51.397.3
166010.51.396.5
176010.51.397.1