Two-Stage Conversion of High Free Fatty Acid Jatropha curcas Oil to Biodiesel Using Brønsted Acidic Ionic Liquid and KOH as Catalysts

Table 3

Reusability study of ionic liquid^b.

Run	Conversion of FFA (%)	Acid value	FFA (wt%)
1	92.5	1.217	0.61
2	91.3	1.412	0.70
3	89.5	1.704	0.85
4	88.1	1.932	0.97

bReaction conditions: 𝑛(methanol) : JCO : 𝑛([BSMIM]Cl) = 12 : 1 : 0.32; 70°C; 6 h.