Biodiesel is the product of the transesterification reaction of vegetable oils or animal fats with a short-chain alcohol, such as methanol or ethanol . Because it is an oxygenated fuel and free of aromatic and sulfurized components, it has a more efficient combustion, reducing the emissions of many polluting gases, such as sulfur dioxide, carbon monoxide, hydrocarbons, and particulate matter . Comparatively, butanol has demonstrated potential as a fuel soon, with energetic power comparable to petro-fuels while being less corrosive, less volatile, and less explosive . Furthermore, butanol can be obtained from biomass through the acetone-butanol-ethanol (ABE) fermentation process .