Improvement of Physicochemical Characteristics of Monoepoxide Linoleic Acid Ring Opening for Biolubricant Base Oil

Table 1

Independent variables and their levels for D-optimal design of the oxirane ring opening reaction.

Independent variables		Variable levels
		−1	0	+1
(1) OA/MEOA (w/w)	𝑋1	0.30	0.45	0.60
(2) PTSA/MEOA (w/w)	𝑋2	0.2	0.35	0.5
(3) Temperature (°C)	𝑋3	90	100	110
(4) Time (h)	𝑋4	3	4.5	6