In this study, the correlation between response, yield and three parameters, reaction temperature, amount of catalyst, KOH and methanol to oil molar ratio were analyzed using reactive extraction batch reactor. The experimental data of the three parameters and the response yield were shown in Table 3. The Response Surface Methodology was conducted to find the relationship between the catalyst, temperature and methanol to oil molar ratio. In this process, methanol acts as the solvent for extraction and transesterification process. This investigation was to obtain high yield of biodiesel without adding co-solvent.
A model for the experimental design was fitted using Design Expert 6.0.7 (Stat-Ease Inc., USA). There is no transformation is required to improve the model. Final equation in terms of ( coded factors) experimental data was: