Table 2. ANOVA for the Response Surface Quadratic Model Obtained for the Reactive Extraction of Castor Kernel Oil.

source	sum of squares	df	mean square	F-value	p-value
model	5041.61	9	560.18	2280.92	<0.0001	significant
A—methanol to oil molar ratio	2695.82	1	2695.82	10976.78	<0.0001
B—catalyst concentration	166.88	1	166.88	679.51	<0.0001
C—temperature	586.98	1	586.98	2390.04	<0.0001
AB	6.18	1	6.18	25.15	0.0005
AC	87.85	1	87.85	357.70	<0.0001
BC	5.33	1	5.33	21.70	0.0009
A2	1195.72	1	1195.72	4868.69	<0.0001
B2	75.73	1	75.73	308.35	<0.0001
C2	406.33	1	406.33	1654.47	<0.0001
residual	2.46	10	0.2456
lack of fit	2.05	5	0.4098	5.03	0.0503	not significant
pure error	0.4071	5	0.0814
Cor total	5044.07	19
R2= 0.9995, R2 adj = 0.9991	predicted R2 = 0.9968, CV = 6.588%