I want to discuss the effect of parameters on the kinetics of esterification for bio-diesel production. In esterification process, temperature effect and molar ration are two important parameters. During conversion of oliec acid with methanol to bio-diesel, temperature contributes more than molar ratio ( happen before 70 to 80 % conversion to bio-diesel). But after 70 to 80% conversion molar ratio contribute more than temperature.
My question is why this happens. Why the contribution of temperature and molar ratio reverse after 70 to 80% conversion to bio-diesel?