951045.fig.002a
(a)
951045.fig.002b
(b)
951045.fig.002c
(c)
Figure 2: (a) Sulfur removal as a function of O/S, acid/S = 2, and time = 150 min. (b) Sulfur removal as a function of acid/S, O/S = 3, and time = 100 min. (c) Sulfur removal as a function of time, O/S = 28, and acid/S = 2 (oxidation condition: T = 65°C; aqueous phase pH = 1.5. Extraction condition: T = 22°C; solvent-to-oil phase volume ratio = 1; number of extraction stages = 2).