Table 2.

Box-Behnken design consisting of experiments for the study of three experimental factors in coded and actual levels with experimental results.

Run no.	Coded variables			Process variables			Actual EE (%)	Predicted EE (%)
	X1	X2	X3	X1	X2	X3
1	−1	−1	0	3.00	2.00	250	89.89	89.97
2	1	−1	0	5.00	2.00	250	91.72	92.34
3	−1	1	0	3.00	4.00	250	89.62	89.00
4	1	1	0	5.00	4.00	250	95.15	95.07
5	−1	0	−1	3.00	3.00	200	90.48	90.92
6	1	0	−1	5.00	3.00	200	95.54	95.43
7	−1	0	1	3.00	3.00	300	90.19	90.30
8	1	0	1	5.00	3.00	300	94.68	94.24
9	0	−1	−1	4.00	2.00	200	92.85	92.33
10	0	1	−1	4.00	4.00	200	93.26	93.44
11	0	−1	1	4.00	2.00	300	91.84	91.66
12	0	1	1	4.00	4.00	300	91.78	92.30
13	0	0	0	4.00	3.00	250	94.72	94.01
14	0	0	0	4.00	3.00	250	93.75	94.01
15	0	0	0	4.00	3.00	250	93.90	94.01
16	0	0	0	4.00	3.00	250	94.09	94.01
17	0	0	0	4.00	3.00	250	93.59	94.01