Each reaction was carried out for a specified reaction time period. The recycling studies were performed using the 20% CaO/n-Al2O3 catalyst. After completion of each run, the catalyst was separated from the reaction mixture and washed several times with methanol and n-heptane solvents simultaneously to remove the surface bound glycerides, i.e. triglycerides (TG), diglyceride (DG) and monoglyceride (MG), from the catalyst.