“…Similar results were obtained by increasing temperature from (50, 55, and 60 °C) and lowering catalyst concentration to the lower level (0.4 wt%), which decreased biodiesel output to 1.23, 1.11, and 1.67% while maintaining methanol at 86.5 ml as a constant. The generation of soap may be strongly impacted by the high temperature and catalyst concentration, which may favor the saponification of triglycerides and lead to decreased biodiesel yield [ 61 ]. There is no statistically significant interaction between the concentration of NaOH catalyst and reaction temperature, as can be seen from Table 6 ANOVA results.…”