The influence of methanol to seed ratio
(2:1–6:1), amount of alkali (KOH) catalyst (0.05–0.1 mol/L in methanol), stirring speed (700–900 rpm),
temperature (40–60
°
C) and reaction time (3–5 h) was examined to define optimum biodiesel yield
and biodiesel quality after water washing and drying. When stirring speed, temperature and reaction
time were fixed at 700 rpm, 60°C and 4 h respectively, highest biodiesel yield (80%witha fatty acid methyl ester purity of 99.9%) and optimum biodiesel quality were obtained with a methanol to seed ratio of 6:1 and 0.075 mol/L KOH in methanol.