Preparation of Biodiesel from Waste Cooking Oil Catalyzed by Sodium Hydroxide

Abstract

One alternative energy source that required to be developed in India is biodiesel. Used cooking oil is raw material for making biodiesel. The biodiesel was made from used cooking oil and methanol using the transesterification method with NaOH catalyst. The production of biodiesel from used cooking oil Start with mixing raw materials of used cooking oil collected into one. The mixture is then precipitated for 24 hours. The transesterification process was carried out by mixing NaOH (2% of oil weight) with methanol (ratio of methanol: oil 6: 1) at a temperature of 65 oC. After the temperature is reached, the methanol and NaOH solution is added slowly while stirring, with a variation of time 30, 45, 60 ,75 and 90 minutes. Biodiesel purification is done by washing using hot water (temperature 70 °C) washing. Characteristics of biodiesel based on the best conditions for density 0.9104 g / mL, viscosity 0.589 cm²/s, acid value 6.1 mg NaOH and flash point 165 oC.