Bio-fuels and how effective they truly are for the environment Essay

Biodiesel Biodiesel, classified as a renewable and biodegradable diesel fuel which is produced thru extraction of natural fats and oils. It can substantially reduce green house gas emission due to its low sulfur content. It is now commonly used in various parts of the world. Biodiesel can replace petroleum diesel in both the transport and non-transport applications. A shift in the utilization of alternative energy resources (including alternative fuels) will change the total demand for biodiesel as well as the level of utilization in specific applications. Bioethanol â€Å"Bioethanol is a high-octane, water-free alcohol produced from the fermentation of sugar or other converted biomass. In its purest form it is a colorless clear liquid with mild characteristic odor that boils at 78oC and freezes at 112oC† (www. doe. gov. ph). Ethanol burns more cleanly because it contains oxygen and has a high octane number, hence less carbon monoxide emissions and averts premature detonation. It burns slightly cooler, extending engine life, and promotes higher volumetric efficiency of the engine, thus, increases power. Adding ethanol to gasoline â€Å"oxygenates† the fuel so that it burns with less emissions. Most modern gasoline vehicles could operate on pure ethanol with a few basic engine modifications. â€Å"A 10% blend requires no engine modification while making a contribution to reducing emissions. Anything more than 10% requires engine modification† (www. doe. gov. ph). The other commercial blends are E15 (U. S. A. ), E20 (Brazil), E85 (Sweden and Minnesota), and E100 (used with 4% water in Brazil and Argentina). Fuel ethanol is primarily used for land transport as alternative to gasoline in spark-ignition engines. Other Biofuels The potentials of other alcohols such as methanol, propanol and butanol can be exhaustively explored for very specific future applications that can further increase the total amount of biofuel substitute to conventional fossil and fossil derived fuels. Methanol produced from biomass is not economically competitive at present. There is, however, an interesting possibility as alternative to hydrogen as fuel. Propanol and butanol can be produced by the action of microorganisms and enzymes. Butanol, particularly, is produced by fermentation in a process that can be modified for high net enegy gains. It has sufficiently similar characteristics with gasoline fuel such that there is high probability that it can be burned pure in existing commercial engines without modification and without any difficulty. There are other important biofuels such as biogas, charcoal, producer gas, etc. They can be processed and utilized in accordance with the provisions of existing laws, rules, regulations and standards. Studies are conducted in order that these important biofuels can be integrated into the biofuels program in a package for both energy and socio-economic objectives. Other First Generation Biofuels. The most common First Generation Biofuel is biogas which is a product of anaerobic digestion of organic materials an example of which is methane from wastes. Both the gas and digestate can be used as fuel. The utilization is usually site specific because of the environmental implications of production. A number of big commercial farms are producing and using biogas from wastes for process heating and the generation of supplementary power. Another first generation biofuel is Charcoal which is the product of the carbonization of hydrocarbon materials including wastes. Producer gas is from the gasification of hydrocarbon feedstock. In the late seventies, this fuel was utilized as engine fuel. The gas was generated from small wood chips fed into a reactor mounted unto the vehicle. Second-generation Biofuels â€Å"Second generation biofuels are those from lignocellulosic biomass feedstock using advanced technical processes. Being currently developed are: BioHydrogen, Bio- dimethylether (Bio-DME), Biomethanol, dimethylfuran (DMF), High Temperature Upgrading (HTU) diesel, Fischer-Tropsch diesel, Mixed Alcohols† (http://www. export. gov).