1) is a kind of biofuel produced from biological substances which can fuel standard diesel engines. A number of and can be used to produce biodiesel. Biodiesel is formed as a result of chemical reaction of vegetable oils, waste oils or animal fats with in the presence of an appropriate During reaction, fatty acids present in the structure of vegetable fat molecule (. forms a new . with alcohol. forms as a byproduct of the reaction revealed. Chemically, biodiesel can be defined as esters of long chain fatty acids which is derived from a renewable biological source. To obtain biodiesel, a bio-oil is reacted with a short chain alcohol (such as ) and being accelerated by the reaction yields an ester and glycerin in the end. is the reaction process of exchanging the organic . of an ester of fats in the structure of triglyceride (vegetable oils, domestic waste oil, animal fats) with the organic of an which is catalyzed by the addition of a base catalyst. This process is also called as reaction in which the vegetable oil reacts with low molecular weight of alcohol in the presence of catalyst, which results in formation of and thus in production of biodiesel. Glycerin makes the thick and adhesive