Making biodiesel

The process is to put lye( AKA caustic soda/"draino") in vegetable oil,and that will separate the glycerin which will fall to the bottom and will need to be disposed of, and then put in some type of alcohol such as isopropyl or methanol into the new mixture and it will react to produce biodiesel.
It should work in any diesel engine but you may need to change the rubber fuel lines and fuel filter shortly after have been using biodiesel.You can also make a mixture of biediesel and regular diesel.
So if you make your own alcohol and vegetable oil and you will have to only buy caustic soda in order to make a supply of biodiesel fuel. Although you need to use different amounts of Lye for different degrees of rancidity of the vegetable oils. So do a titration test. Now just figure in the cost of each ingredient needed, and the amount of product produced from that and you will get the "cost/gallon".(usually around .50 cents/gallon)

The following was found under " biodiesel" on Wikipedia:
August 31, 1937, G. Chavanne of the University of Brussels (Belgium) was granted a patent for a "Procedure for the transformation of vegetable oils for their uses as fuels" (fr. 'Procédé de Transformation d’Huiles Végétales en Vue de Leur Utilisation comme Carburants') Belgian Patent 422,877. This patent described the alcoholysis (often referred to as transesterification) of vegetable oils using methanol and ethanol in order to separate the fatty acids from the glycerol by replacing the glycerol by short linear alcohols. This appears to be the first account of the production of what is known as "biodiesel" today.

Biodiesel is a renewable fuel that can be manufactured from vegetable oils, animal fats, recycled restaurant greases, and some types of algae; it can be produced locally in most countries. It is safe, biodegradable and reduces air pollutants, such as particulates, carbon monoxide and hydrocarbons. Blends of 20 percent biodiesel with 80 percent petroleum diesel (B20) can generally be used in unmodified diesel engines. Biodiesel can also be used in its pure form (B100), but may require certain engine modifications to avoid maintenance and performance problems.

Biodiesel refers to a non-petroleum-based diesel fuel consisting of short chain alkyl (methyl or ethyl) esters, typically made by transesterification of vegetable oils or animal fats, which can be used (alone, or blended with conventional petrodiesel) in unmodified diesel-engine vehicles.

Belgian Patent 422,877. This patent described the alcoholysis (often referred to as transesterification) of vegetable oils using ethanol (and mentions methanol) in order to separate the fatty acids from the glycerol by replacing the glycerol with short linear alcohols. This appears to be the first account of the production of what is known as 'biodiesel' today.^{[4]
ADDED LATER:}

• ^{If you're making a small batch: Use a throwaway blender on low speed for 1/2 hour to an hour, to blend it and then pour into another container to let the glycerol settle to be thrown away later.}
  
• ^{Biodiesel dissolves rubber, so change the fuel lines in car to synthetic}
• ^{Do a Titration test of the oil to see how acidic it has become, to know how much methanol or ethanol to add to the mixture. Because every batch is different.}
• ^{Titration test 1st method: Is mixing an indicator solution and the titrating solution which is lye powder (of a specified amount) and then against that reference amount you add small amounts of oil at a time until the indicator changes the color of the entire sample.The indicator that was added is called (phenolphthalein,or turmeric) Which turns pink. Then you measure the ratio of oil to lye powder that was used in the sample and you will know how much oil/lye/methanol needed for a big batch.}
• ^{Mix 1 liter of water with 1 gram of catalyst exactly.(The catalyst is '''lye")This is how to make lye water. But in the real batch of biodiesel you don't want any water to be in it, so only use the lye powder without any water added. To not have to filter the water out later}
  
• ^{Titration test 2nd method:First put alcohol in a glass container and then add a tiny bit of home made PH indicator of Turmeric, which turns pink when it's at the right PH. It should turn a little pink because alcohol is slightly acidic. Then put a specified amount of lye powder in the glass container of alcohol and indicator, and then slowly add the oil that hadn't put in yet a little bit at a time (drops at a time) until the solution changes color, making sure to measure the amount that was put in it, in the end. And you will then know the ratio of lye/ oil to use in a bigger batch.}
  
• ^{http://www.freedomfuelamerica.com/}
• ^{When the biodiesel has been fully reacted you then separate the fuel from the glycerol by either pouring out the glycerol from a hole in the bottom of the container(easier to do if you have that kind of container) or pouring/siphoning the fuel from the top of the container.}
• ^{Then to further purify the fuel you want to boil away any excess unreacted alcohol(or methanol) and you may distill it to be used later, also, if needed. But it may not be necessary.}
  
• To mix the fuel better, in a large tank:^{May use a small air bubbler(The kind used in fish tanks. Get it at a thrift store for $1) and also a tank heater to aid in reaction. The large tank should have a draining spout at the bottom of the container.}
  
• ^{Then pour the good fuel into a gas can and put into diesel engine car.}
• ^{The best homemade biodiesel product out there:}http://www.fuelmeister.com/