Table 3.

Central composite rotatable design with the experimental values of the response variables (Water solvent)

Run order	Time (min)	Liquid/Solid ratios X2	Total phenol (mg/g) Y1	Yield (%)
	X1			Y2
1	6	17.5	19.68	8.3
2	4	10	17.88	7.52
3	2	10	16.5	6.83
4	4	17.5	18.5	7.96
5	2	25	16.61	6.5
6	4	17.5	18.52	7.9
7	4	17.5	18.54	7.88
8	4	17.5	18.55	7.87
9	4	17.5	18.3	7.93
10	6	25	19	8
11	4	25	18.2	7.12
12	2	17.5	16.84	7.09
13	6	10	18.85	7.85