Biodiesel is a renewable and clean burning fuel made from waste vegetable oil, animal fat or recycled restaurant grease for diesel vehicles. Why biodiesel has been recommended now? Actually, Biodiesel produces less toxic pollutants and greenhouse gases than petroleum diesel. So this is important point which it is green and environmental protection. There are other reasons we initiate to use it, such as it is domestically produced and can be used in any diesel engine with little or no modification to the engine or the fuel system; it may reduce foreign oil dependence; It can positive Economic Impact; it is easy to make and even at home to make it by own. Well, so how to make Biodiesel is the topic today that I will expound below,
If you plan to make clean, high quality bio diesel for cheap, you may reference some methods,
1. The waste vegetable oil is first filtered to remove the large pieces of food left by the fryer. We used a paint filter. The filtrate is mostly breadcrumbs and occasionally there are somethings about chunk of waste. Mix all oil from different sources to get a uniform sample.
2. Next we need to titrate to observe the acidity of the oil. A small amount of the phenolphthalein indicator dye was added to the carefully prepared mixture of methanol and sodium hydroxide. An acid waste oil sample was added to the mixture using a calibrated pipette.
3. Turbulent in the prepared base reagent until the mixture remained purple for 10 seconds. The amount of reagent added here determines the amount of methoxide (methanol/sodium hydroxide mixture), then added to the oil to complete the transesterification process. Need some simple math or look up table to calculate the totally amount.
4. This method is that the oil was heated to 120 F and then a calculated amount of methanol/hydroxide mixture was added. The Fuel-Meister processor we use allows you to mix methanol/lye in a tank mounted to the lid. Transfer the transfer pump hose back to the container and stir for one hour. At this point, the oil will be converted to bio diesel. Let the heavier glycerin precipitate for a few hours.
5. Glycerol is discharged from the bottom until a lighter color of it, thinner bio diesel is injected from the valve. The excess methanol, soap residue and lye in the bio diesel is then washed with water. The water will settle to the bottom of the container within a few hours, where you can drain it.
6. Allow the fuel to expose in air for one or two days, then allowing any turbidity (caused by a small amount of remaining water) to dissipate.
This is the process that chemistry involved in transforming vegetable oil into bio diesel. The vegetable oil (VO) is made up of chains of fatty acids held together by glycerol molecules. The alcoholic
antioxidants are separated by fatty acids apart. The corrosive, alkaline lye (sodium hydroxide, although you can also use potassium Hydroxide, breaks the glycerol (a heavy alcohol) off those chains and the methanol (a light alcohol) in turn takes the place of the glycerol, leaving shorter, lighter, more combustible molecules.