How to Make Biodiesel

On a small scale can be done with 1 liter of cooking oil new or used. Methanol as much as 200 ml or 0.2 liters. Caustic soda or NaOH 3.5 gram to clean cooking oil, if needed 4.5 grams of used oil or maybe more.

This excess is needed to neutralize free fatty acids or FFA a lot of used frying oil. KOH can also use the more expensive but has a price and required 1.4 times more than the soda. The process of making; Soda fire was dissolved in methanol and then inserted into the heated oil about 55 oC, stirred rapidly for 15-20 minutes and then left overnight in a cold state. Then it will be obtained biodiesel at the top with clear yellowish color and slightly lower mix of soap from FFA, the remaining unreacted methanol and glyserin about 79 ml. Biodiesel which is a yellowish liquid at the top are separated easily by pouring and removing the bottom of the liquid. For large-scale bottom product can be purified to obtain valuable glycerin expensive, also the soap and residual methanol that does not react.