Optimization of Sunflower Oil Transesterification Process Using Sodium Methoxide

Table 1

The matrix of central composite design (CCD) resulted from response surface methodology design of experiment.

Treatment run	Blocks	Time of reaction (𝑥1, min)	Excess stoichiometric amount of alcohol to oil (𝑥2, w/w%)	Catalyst amount (𝑥3, w/w%)
1^c	2	120	75	0.5
2	2	150	50	0.3
3	2	90	100	0.3
4^c	2	120	75	0.5
5	2	90	50	0.7
6	2	150	100	0.7
7^c	1	120	75	0.5
8	1	150	50	0.7
9	1	150	100	0.3
10	1	90	50	0.3
11^c	1	120	75	0.5
12	1	90	100	0.7
13	3	120	25	0.5
14^c	3	120	75	0.5
15	3	60	75	0.5
16	3	120	125	0.5
17	3	120	75	0.9
18	3	180	75	0.5
19	3	120	75	0.1
20^c	3	120	75	0.5
Opt. point*	—	60	25	0.5

^cCenter point.
^*The optimum point was resulted from the optimization procedure.