Increased energy consumption and the depletion of petroleum reserves have pushed up oil prices globally. TheÂ diminishing petroleum reserves are a problem inherent in this type of fossil energy. One alternative energyÂ source that has the potential to be developed in Indonesia is biodiesel. Used cooking oil or used cooking oil is aÂ potential raw material for making biodiesel. In this study biodiesel was made from used cooking oil andÂ methanol using the transesterification method with KOH catalyst. The production of biodiesel from used cookingÂ oil begins with mixing raw materials of used cooking oil collected into one. The mixture is then precipitated forÂ 24 hours. The transesterification process was carried out by mixing KOH (1% of oil weight) with methanol (ratioof methanol: oil 6: 1) at a temperature of 65 oC. After the temperature is reached, the methanol and KOHÂ solution is added slowly while pumping (stirring), with a variation of time 30, 45, 60.75 and 90 minutes.Â Biodiesel purification is done by washing using hot water (temperature 70 ï°C) twice as much washing.Â Characteristics of biodiesel based on the best conditions for density 0.886 g / mL, viscosity 5.89 cSt, FFA 0.11%Â , acid value 0.256 mgKOH/g and flash point 170.52 oC. The biodiesel products based on these parameters meetÂ SNI 7182-2015 standards.
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