Diesters Biolubricant Base Oil: Synthesis, Optimization, Characterization, and Physicochemical Characteristics

Figure 2

Response surface (a) and contour plots (b) for the effect of reaction temperature (𝑋₃, °C) and reaction time (𝑋₄, h) on the yield (Y, %) of OLHYOOD.

(a)

(b)