Effect of reaction time on FFA conversion
As far as the effect of the reaction time on FFA conversion was concerned, the
effect of reaction time on FFA conversion is shown in Fig.4. Ferric sulfate
loaded on activated carbon can catalyze methanolysis of FFA, so the acid value
can be calculated for the conversion of FFA. Ferric sulfate loaded on activated
carbon was used to catalyze the esterification of short chain organic acid with
alcohol and showed good activity as a solid Lewis acid (Wang et al. 2007, Peng
et al. 1999, Wen et al. 2001). The results show that the methanolysis of FFA in
PFAD. The reaction rate was increased during 0.5 to 6 h of reaction, over
98.22% of FFA was converted into FAME within 6 h, so the excess of boiling
methanol was easy to react with FFA. The reaction of methanolysis approached
equilibrium after 6 h, and prolonging the reaction time did not increase the
conversion of FFA significantly.