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fuel production
Ethanol fuel is an alcohol-based fuel commonly produced by fermenting sugars from crops such as corn, sugarcane, and other biomass, although it can also be synthesized from petroleum derivatives. While it is the same type of alcohol as found in alcoholic beverages, it is most often used as an alternative to gasoline in transportation, either as a pure fuel or blended into gasoline mixtures as a biofuel additive, to reduce reliance on fossil fuels and lower greenhouse gas emissions. Ethanol fuel in Brazil and the United States dominate global ethanol production, together accounting for the majority of supply, and many countries mandate ethanol blending in automotive fuels.
Historically, ethanol has been used as a fuel since the early 20th century, with Brazil pioneering large-scale adoption during the 1970s energy crisis. Advances in flexible-fuel vehicle technology and government policies have expanded its use worldwide. Ethanol's chemical composition (C2H5OH) allows it to burn cleanly, producing carbon dioxide and water, and its high octane rating makes it suitable for high-compression engines. Most ethanol is produced through microbial fermentation of sugars, followed by distillation and dehydration, though synthetic ethanol from ethylene remains a small share of global output.
Ethanol is considered a renewable energy source, but its production raises environmental and economic concerns. While sugarcane-based ethanol in Brazil offers a favorable energy balance and lower carbon emissions compared to gasoline, corn-based ethanol in the United States provides more modest benefits. Large-scale cultivation for ethanol can affect food prices, water resources, and land use, and emissions from production and combustion vary by feedstock and process. Research continues into cellulosic ethanol and other advanced methods to improve sustainability and reduce environmental impact.
Several common ethanol fuel mixtures are in use around the world. The use of pure hydrous or anhydrous ethanol in internal combustion engines (ICEs) is possible only if the engines are designed or modified for that purpose. Anhydrous ethanol can be blended with gasoline (petrol) for use in gasoline engines, but only after engine modifications are made since pure ethanol contains only a fraction of the energy of an equivalent volume of pure gasoline. Despite its inefficiency compared to gasoline, Ethanol is eco-friendlier and produces less greenhouse emissions upon combustion due to more complete combustion as compared to gasoline, leading to less toxic gases emitted, making it an eco-friendly alternative.
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Historically, ethanol has been used as a fuel since the early 20th century, with Brazil pioneering large-scale adoption during the 1970s energy crisis. Advances in flexible-fuel vehicle technology and government policies have expanded its use worldwide. Ethanol's chemical composition (C2H5OH) allows it to burn cleanly, producing carbon dioxide and water, and its high octane rating makes it suitable for high-compression engines. Most ethanol is produced through microbial fermentation of sugars, followed by distillation and dehydration, though synthetic ethanol from ethylene remains a small share of global output.
Ethanol is considered a renewable energy source, but its production raises environmental and economic concerns. While sugarcane-based ethanol in Brazil offers a favorable energy balance and lower carbon emissions compared to gasoline, corn-based ethanol in the United States provides more modest benefits. Large-scale cultivation for ethanol can affect food prices, water resources, and land use, and emissions from production and combustion vary by feedstock and process. Research continues into cellulosic ethanol and other advanced methods to improve sustainability and reduce environmental impact.
Several common ethanol fuel mixtures are in use around the world. The use of pure hydrous or anhydrous ethanol in internal combustion engines (ICEs) is possible only if the engines are designed or modified for that purpose. Anhydrous ethanol can be blended with gasoline (petrol) for use in gasoline engines, but only after engine modifications are made since pure ethanol contains only a fraction of the energy of an equivalent volume of pure gasoline. Despite its inefficiency compared to gasoline, Ethanol is eco-friendlier and produces less greenhouse emissions upon combustion due to more complete combustion as compared to gasoline, leading to less toxic gases emitted, making it an eco-friendly alternative.
View More On Wikipedia.org