In Situ Transesterification of Spirulina Microalgae to Produce Biodiesel Using Microwave Irradiation

Table 5

Experimental matrix and results from RSM central composite design.

Variables (actual)					Yield (%)
STD	Run	Catalyst Conc. ()	Volume of CH3OH ()	Reaction time () ()	Experimental	Predicted
3	1.	1	12	3	37.56	38.5363
2	2.	3	6	3	42	42.8006
11	3.	2	4	6	38.32	37.6164
13	4.	2	9	1	46.56	46.9381
6	5.	3	6	9	63.76	63.9538
16	6.	2	9	6	79.4	80.294
7	7.	1	12	9	44.4	44.7695
17	8.	2	9	6	80.66	80.294
9	9.	0.32	9	6	49	48.0875
14	10.	2	9	11	72	69.9672
20	11.	2	9	6	83.43	80.294
8	12.	3	12	9	69.96	71.8784
12	13.	2	14	6	42.62	41.6688
19	14.	2	9	6	78.12	80.294
5	15.	1	6	9	48.958	50.8439
4	16.	3	12	3	54.41	53.6942
18	17.	2	9	6	78.75	80.294
1	18.	1	6	3	42.39	41.6417
10	19.	3.682	9	6	72.6	71.8578
15	20	2	9	6	81.12	80.294