Sylvie Willis
Alcohol has been used as an alternative fuel for cars for almost a century, and its potential as a renewable energy source has attracted significant worldwide attention. Alcohols such as ethanol, butanol, and methanol can be used as fuel, with ethanol being the most common due to its ability to be produced through the fermentation of sugars. While alcohol has advantages such as a high octane rating, it also has drawbacks, including lower energy density compared to gasoline, resulting in reduced fuel efficiency and mileage. Additionally, alcohol is more expensive to produce than gasoline, and its corrosive nature can damage fuel systems. Despite these challenges, countries like Brazil have successfully adopted ethanol as a primary fuel, and with the increasing cost of fossil fuels and growing environmental concerns, alcohol may play a more significant role in the future energy landscape.
| Characteristics | Values |
|---|---|
| Can alcohol be used as fuel for cars? | Yes |
| Is alcohol a viable alternative to gasoline? | No |
| Why isn't alcohol a viable alternative to gasoline? | Alcohol doesn't produce the same amount of power as gasoline, so you get less mileage per gallon. |
| Are there other reasons why alcohol isn't a viable alternative to gasoline? | Yes, alcohol is corrosive and can destroy fuel system components unless they are specifically designed for it. |
| What are the benefits of using alcohol as fuel? | Alcohol is cleaner to burn than gasoline and can be produced from renewable sources, such as biomass or carbon dioxide and water. |
| What are the drawbacks of using alcohol as fuel? | Alcohol is more expensive to produce than gasoline, and large quantities of raw materials are required to achieve the same mileage as traditional petroleum-based fuel. |
| Which types of alcohol are used as fuel? | Ethanol, butanol, methanol, and fusel oil and ethers (methyl tertiary butyl ether (MTBE) and Dimethyl Ether (DME)) |
| Where is alcohol used as fuel for cars? | Brazil, the United States, and the United Kingdom |
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What You'll Learn
Ethanol can be produced by fermenting sugar solutions
Alcohol can be used as a fuel for cars, and ethanol is the alcohol found in beer, wine, and spirits. Ethanol can be produced by fermenting sugar solutions, a process known as ethanol fermentation. This process involves the conversion of sugars, such as glucose, fructose, and sucrose, into ethanol and carbon dioxide using yeast or other microorganisms. The yeast Saccharomyces, for instance, converts sugar into ethanol and carbon dioxide at a warm temperature in an anaerobic process, i.e., in the absence of oxygen.
Ethanol fermentation is a well-known and important process in the biotechnology industry, with about 4.5 billion gallons of ethanol produced annually in the US alone from corn for transportation fuel. The process is slow and can take days or weeks to finish. It is also used in the production of alcoholic beverages and bread dough rising.
The feedstock for ethanol production varies depending on the region. In warmer regions, sugarcane is the dominant feedstock, while corn or sugar beets are used in temperate regions. Brazil, for example, has been a major producer of ethanol fuel, typically fermenting ethanol from sugarcane. The country produces a total of 18 billion liters (4.8 billion gallons) annually, of which 3.5 billion liters are exported, with 2 billion going to the US.
In recent years, there has been a focus on using sustainable sources for ethanol production. Starches, such as cassava, are considered the cheapest source, and other options like pearl millet and duckweed are being explored. Additionally, there is research into converting waste products, such as stale bread and biomass, into ethanol.
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Methanol is toxic, colourless, and cheaper than ethanol
Alcohol has been used as a fuel for cars, with methanol and ethanol being the most common types. Both methanol and ethanol are types of alcohol, but they have distinct chemical structures, properties, uses, and effects.
Methanol (or methyl alcohol) is a highly toxic substance and is unsuitable for drinking. Consuming even a small amount can cause serious health issues, including blindness and death. It is commonly found in household and industrial products, such as windshield wiper fluid, industrial solvents, and some types of antifreeze. Methanol has been used as a racing fuel and has a long history in Grand Prix Racing. It burns cooler than regular gasoline or ethanol, resulting in condensation on the air intakes of race cars. Methanol can be produced from synthesis gas, and modern methods involve using enzymes instead of fermentation. It is a simple molecule that can be derived from fossil fuels, biomass, or carbon dioxide and water.
In contrast, ethanol is the type of alcohol found in alcoholic beverages. It is traditionally and commercially produced through the fermentation process of sugars using yeast. While ethanol can be derived from fossil fuels or biomass, it is most commonly produced from sugarcane, as seen in Brazil, the largest producer of alcohol fuel. Ethanol has a higher combustion energy density than methanol, resulting in better fuel efficiency.
Despite their differences, both methanol and ethanol have their advantages as fuel for cars. Methanol is cheaper than ethanol, and its use in fuel cells can generate a higher voltage. On the other hand, ethanol is safer due to its lower toxicity and is more suitable for flexible-fuel engines, as seen in Brazil's "Flex" cars.
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Alcohol is corrosive and can destroy fuel systems
Alcohol can be used as fuel for cars and has been used in the past, especially in Brazil, where alcohol cars debuted in 1979 and became quite popular due to heavy subsidies. However, one of the main drawbacks of using alcohol as fuel is that it is corrosive and can destroy fuel systems over time.
Ethanol, an alcohol fuel made from grains, corn, and other plant materials, is highly water-soluble. This means that when left in the fuel system, water and ethanol can cause rusting, fuel degradation, and other problems. The mixture of ethanol and water also creates an environment for bacteria called acetobacter to grow, which produces acetic acid, a highly corrosive substance. This can lead to severe engine damage and fuel system corrosion.
The existence of oxygen in ethanol also increases metal corrosion attacks. Stainless steel, for example, exhibits a lower corrosion rate due to its ability to form a thin passive layer of oxides on its surface, which insulates it from corrosion. On the other hand, copper and brass corrode more quickly than mild steel because of their lower passivation potential.
To mitigate the corrosive effects of ethanol, fuel additives like Biobor EB can be used, which reduce corrosion and protect fuel lines and tanks from contaminants. Regular maintenance checks and inspections of the fuel system are also essential to ensure that the engine is not being damaged by ethanol fuel.
In summary, while alcohol can be used as fuel for cars, its corrosive nature can lead to serious problems for vehicles and fuel systems over time. Proper care, maintenance, and the use of fuel additives can help minimize the risk of corrosion and engine damage.
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Alcohol has been used as fuel for almost 100 years
Ethanol was first isolated from wine in 1100 and was soon found to burn. These early solutions, distilled from wine-salt mixtures, were called aqua ardens (burning water) or aqua flamens (flaming water). They had such low alcohol content that they burned without producing noticeable heat. By the 13th century, the development of the cooling coil allowed the isolation of nearly pure ethanol by distillation.
In the 19th century, alcohol-based fuels were used almost exclusively as burning fluids. For example, small alcohol stoves (also called "spirit lamps") were commonly used by travelers in the 17th century to warm food and themselves. Before the American Civil War, many farmers in the United States had an alcohol still to turn crop waste into free lamp oil and stove fuel for their families' use.
In 1826, Samuel Morey created an ethanol-fueled experimental car. In 1899, the German government taxed petroleum imports and subsidized domestic ethanol. Henry Ford's first car, the Quadracycle, was built in the same year and ran on gasoline, but Ford was aware of experiments with ethanol in Germany and subsequently backed the lifting of the U.S. tax on industrial uses of ethanol.
In 1908, the Ford Model T was introduced with adjustable carburetors to run on ethanol, with gasoline as an option. In 1909, the U.S. Geological Survey praised alcohol as a fuel, noting its cleanliness and absence of smoke and disagreeable odors compared to gasoline or kerosene. In 1914, the Free Alcohol bill was amended to decrease the regulatory burden and encourage alcohol fuel production in the U.S. In 1917, Alexander Graham Bell said: "Alcohol makes a beautiful, clean and efficient fuel… Alcohol can be manufactured from corn stalks, and in fact from almost any vegetable matter capable of fermentation…".
In 1923, the French assembly passed the Carburant National law, requiring gasoline importers to buy alcohol for 10% blends from the State. In 1949, S. J. W. Pleeth, a chemist for the Cleveland Discol company in Great Britain, wrote about the bias in research on alcohol as a motor fuel, noting that countries with considerable oil deposits or control of oil deposits tended to produce reports against the use of alternative fuels.
In the 1970s, Brazilian President Geisel and his National Alcohol Program successfully revolutionized the nation's fuel industry following OPEC oil price hikes and a national sugarcane surplus. Brazil became the largest producer of alcohol fuel in the world, typically fermenting ethanol from sugarcane. In 1979, alcohol cars debuted in the Brazilian market and became quite popular due to heavy subsidies. However, in the 1980s, prices rose and gasoline regained the leading market share.
In the 2000s, new technologies involving flexible-fuel engines, called "Flex" or "Total Flex", have helped alcohol rapidly increase its market share in Brazil once again.
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Brazil is the world's largest exporter of ethanol
Alcohol can be used as fuel for cars, and ethanol is one of the four major alcohol fuels, along with methanol, propanol, and butanol. Ethanol is produced by the fermentation of sugars, and in the case of Brazil, sugarcane is the primary feedstock. Sugarcane has been cultivated in Brazil since 1532 and was one of the first commodities exported to Europe by Portuguese settlers.
Brazil's success in the ethanol industry is due to several factors, including the country's strong domestic sugarcane and ethanol production, a robust internal market, and flexibility in terms of legislation and regulation. The Brazilian government has also played a significant role in promoting the use of ethanol as a fuel. In 1975, the National Alcohol Program, known as Pró-Álcool, was launched to reduce the country's reliance on foreign fossil fuels by blending petrol with ethanol. Additionally, Brazil has been a pioneer in using ethanol as motor fuel in flex-fuel engines, and the mixing of ethanol with gasoline is required by law.
Brazil's ethanol industry faces some challenges, such as the growing popularity of electric vehicles, which has resulted in Brazil becoming the largest export market for Chinese electric vehicles. However, the country continues to innovate and develop new projects in the biofuel sector, positioning itself as a leader in second-generation ethanol production, which is derived from non-food biomass like sugarcane bagasse.
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Frequently asked questions
Yes, alcohol can be used as fuel for cars. Alcohols such as ethanol, butanol, and methanol have been used as fuels in internal combustion engines for almost 100 years.
Alcohol is a renewable energy source that can be produced from biomass or carbon dioxide and water. It has a high octane rating, which increases fuel efficiency and results in a comparable "fuel economy" in terms of distance per volume. Alcohol also produces fewer toxic emissions than gasoline.
Alcohol is more expensive to produce than gasoline, and it doesn't produce the same amount of power, resulting in lower fuel efficiency and mileage per gallon. Additionally, alcohol is corrosive and can damage fuel system components not designed for it.
Brazil is the largest producer and exporter of alcohol fuel, typically fermenting ethanol from sugarcane. In 2012, approximately 87% of newly-registered vehicles in Brazil ran on alcohol. The United States is also a major user of ethanol fuel, with many cars capable of running on E10 or "gasohol".
