Due to the depletion in fossil fuel and considering environmental degradation it is necessary to look for an alternative fuels, which can be produced from renewable materials available within the country so that cost will be affordable. Although vegetative oils can be used as a fuel for diesel engines, but their high viscosities, low volatilities and poor cold flow properties make those unsuitable to be used as such. Fatty acid methyl esters, known as Biodiesel fuel derived from triglycerides by trans-esterification with methanol, present the promising alternative substitute to diesel fuels and have received the most attention now a day. The main advantages of using Biodiesel are its renewability, better quality exhaust gas emission, its biodegradability and the organic carbon present in it is photosynthetic in origin. It does not contribute to a rise in the level of carbon dioxide in the atmosphere and consequently to the greenhouse effect. Rapeseed, soya bean, peanut, rice bran, sunflower give good yield in conversion to methyl ester of triglyceride ,i.e., biodiesel. But all these are edible oils. Waste vegetable oils, after several time of frying, when food value become almost zero, could be used as the cheap source of biodiesel.
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