Table 2.

D-optimal design arrangement and OOC% response of HYOOA.

Run	Coded independent variable levels				Response
Number	OAa/MEOAb (w/w, X1)	PTSAc/MEOA (w/w, X2)	Temperature (°C, X3)	Time (h, X4)	OOCd (%, Y)
1	0.60	0.20	110	4.5	2.60
2	0.60	0.50	110	6	0.90
3	0.30	0.20	90	4.5	3.80
4	0.30	0.50	90	6	3.20
5	0.30	0.20	110	3	3.40
6	0.30	0.50	90	3	3.10
7	0.45	0.50	100	4.5	2.70
8	0.60	0.50	90	4.5	2.40
9	0.30	0.35	100	4.5	2.10
10	0.30	0.50	100	3	1.80
11	0.30	0.20	100	6	1.50
12	0.30	0.50	90	4.5	2.90
13	0.45	0.20	100	4.5	3.05
14	0.30	0.20	90	3	3.50
15	0.30	0.35	110	6	0.60
16	0.60	0.50	110	3	0.80
17	0.45	0.20	110	6	0.40
18	0.60	0.50	110	3	0.30
19	0.60	0.20	90	3	2.95
20	0.45	0.35	100	3	1.40
21	0.45	0.35	100	5.25	0.20
22	0.60	0.20	100	6	0.90
23	0.60	0.20	90	6	0.70
24	0.30	0.50	110	4.5	0.05
25	0.60	0.35	100	4.5	0.60

Notes: oleic acid (a); 9(12)-10(13)-monoepoxy 12(9)-octadecanoic acid (b); p-toluene sulfonic acid (c); oxirane oxygen content (d).