Figure 1a: Effect of reaction temperature on the reaction progress with time of ethyl acetate in glycerol using NaOH as catalyst. Reaction conditions: 0.1 g ethyl ester, 0.01 g NaOH, 5 g glycerol. (♦) 45°C; (■) 55°C; (▲) 75°C; (x) 100°C.