Regan Brown
Alcohol has been used as a fuel for cars for over a hundred years, particularly in racing cars, where it allows for more power in a smaller, lighter engine. The use of alcohol as a fuel in cars is not new, but it has recently begun to attract significant worldwide attention. The four major alcohol fuels are ethanol, methanol, propanol, and butanol, and they are all produced from biomass, fossil fuels, or carbon dioxide and water. Alcohol fuels have a high octane rating, which increases fuel efficiency and results in a comparable fuel economy in terms of distance per volume.
| Characteristics | Values |
|---|---|
| Advantages | Alcohol fuel has a high octane rating, which increases fuel efficiency. It can be derived from fossil fuels, biomass, carbon dioxide, or water. It has fewer toxic emissions and lower tailpipe emissions of CO2. |
| History | Alcohol-powered engines were first used in the 19th century in Europe for farm machinery, automobiles, and household appliances. Early US automobiles used gasoline, but racing cars often used ethanol due to its ability to develop more power in a smaller, lighter engine. |
| Safety | Alcohol fuel is considered safer than gasoline because it is harder to ignite outside the engine, burns at a cooler temperature, and is easier to extinguish with water-based fire extinguishers. |
| Production | Methanol and ethanol are the most common types of alcohol fuel. Methanol can be produced from nearly any biomass, while ethanol is typically produced through the fermentation of sugars. Brazil was the largest producer of alcohol fuel, primarily from sugarcane. |
| Limitations | Alcohol fuel has lower energy density than gasoline, which means more alcohol is needed to produce the same power. It also has compatibility issues with certain metals due to its acidic form and moisture absorption. |
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What You'll Learn
Ethanol as a fuel
Ethanol, an alcohol fuel, is an important fuel for the operation of internal combustion engines used in cars, trucks, and other machinery. Ethanol was first isolated from wine in approximately 1100 and was found to burn shortly after. These early solutions distilled from wine-salt mixtures were referred to as aqua ardens (burning water) or aqua flamens (flaming water). By the 13th century, the development of the cooling coil allowed the isolation of nearly pure ethanol by distillation.
Ethanol is a renewable fuel made from various plant materials collectively known as "biomass". Ethanol is commonly made from biomass such as corn or sugarcane. In the United States, 94% of ethanol is produced from the starch in corn grain. More than 98% of U.S. gasoline contains ethanol to oxygenate the fuel. Typically, gasoline contains E10 (10% ethanol, 90% gasoline), which reduces air pollution. Ethanol is also available as E85 (or flex fuel), which can be used in flexible fuel vehicles, designed to operate on any blend of gasoline and ethanol up to 83%.
Ethanol has a higher octane number than gasoline, providing premium blending properties. Minimum octane number requirements for gasoline prevent engine knocking and ensure drivability. Lower-octane gasoline is blended with 10% ethanol to attain the standard 87 octane. Ethanol contains less energy per gallon than gasoline, to varying degrees, depending on the volume percentage of ethanol in the blend. The use of pure hydrous or anhydrous ethanol in internal combustion engines (ICEs) is only possible if the engines are designed or modified for that purpose.
Brazil was until recently the largest producer of alcohol fuel in the world, 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, 2 billion of them to the U.S. Alcohol cars debuted in the Brazilian market in 1979 and became quite popular because of a heavy subsidy. The first production car running entirely on ethanol was the Fiat 147, introduced in 1978 in Brazil by Fiat. Since 1976, the Brazilian government has made it mandatory to blend ethanol with gasoline, and since 2007 the legal blend is around 25% ethanol and 75% gasoline (E25).
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Methanol as a fuel
Methanol is a type of alcohol fuel that has been used in the past as the primary fuel ingredient in the power plants of radio-controlled cars and trucks. Methanol has a high octane rating of 114, which can lead to higher thermal efficiency and power output compared to gasoline in engines designed for methanol use. Methanol is also the fuel of choice for most alcohol-based fuel cells.
Methanol has a long history as a racing fuel, with early Grand Prix Racing using blended mixtures or pure methanol. In 2006, all vehicles in the Indianapolis 500 had to run on methanol, and it was used by the CART circuit during its entire 1979-2007 campaign. Methanol is still used by many short-track organisations, especially for midget, sprint cars, and speedway bikes.
Methanol is usually produced from syngas, which is obtained from steam reforming of methane (the main component of natural gas). In China, which produces around 60% of the world's methanol, it is primarily made from coal. Methanol can also be produced from renewable resources like sustainably sourced biomass, agricultural waste, and carbon dioxide. The production of methanol from carbon dioxide is particularly desirable as it can be produced in a carbon-negative way, removing existing CO2 from the air.
Methanol has been piloted in China as a way to transition to a less polluting and less fossil fuel-dependent automotive industry. Methanol cars can be 21% more energy-efficient than gas cars, emitting 26% less carbon dioxide. Methanol is also an attractive option for powering long-haul heavy vehicles like trucks as they can cost roughly the same amount as traditional trucks since the engines are similar.
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Alcohol fuel history
The use of alcohol fuel has a long history, with ethanol first being isolated from wine around 1100 and found to burn soon after. These early solutions, distilled from wine-salt mixtures, were referred to as "burning water" or "flaming water" and burned without producing noticeable heat. By the 13th century, the development of the cooling coil allowed for the isolation of nearly pure ethanol by distillation.
Throughout the 17th century, small alcohol stoves, or "spirit lamps", were commonly used by travellers to warm food and themselves. Before the American Civil War, many farmers in the United States turned crop waste into free lamp oil and stove fuel for their families using alcohol stills. In 1860, German inventor Nicolaus Otto used ethyl alcohol as fuel in an early internal combustion engine.
In the 19th century, alcohol, in combination with oils, was used to power a variety of lamps, stoves, heaters, laundry irons, hair curlers, and coffee roasters in Europe. By 1902, an estimated 95,000 alcohol-fuelled stoves and 37,000 spirit lamps had been manufactured in Germany. During the 1890s, alcohol-fuelled engines began to be used in farm machinery in Europe, increasing fuel independence.
In 1896, the first "horseless carriages" (cars) appeared on the roads of Europe and the United States. Early automobiles in the US were adapted to use gasoline due to its low cost and abundance, while racing cars often used ethanol as it allowed for more power in a smaller, lighter engine. In 1901, the French Ministry of Agriculture offered prizes for the best alcohol-fuelled engines and household appliances. The following year, an alcohol fuel exposition in Paris exhibited a wide range of alcohol-powered machinery and appliances, including cars, farm equipment, and household items.
In 1906, the Free Alcohol Bill was passed in the US, repealing the alcohol tax and making corn ethanol cheaper than gasoline. In 1908, early models of the Ford Model T had adjustable carburetors that could run on ethanol with gasoline as an option. However, due to the taxation of ethanol and the discovery of new oil fields in Texas, the market for ethanol decreased in the early 20th century.
In the 1970s, alcohol-fuelled cars debuted in Brazil and became popular due to heavy subsidies. However, in the 1980s, rising prices led to gasoline regaining market share. In 2003, new technologies involving flexible-fuel engines increased the market share for alcohol fuel once again.
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Alcohol fuel safety
Alcohol has been used as fuel throughout history, with the four most common types of alcohol fuel being methanol, ethanol, propanol, and butanol. These alcohols are of interest as fuels because they can be synthesized chemically or biologically, and they have characteristics that allow them to be used in internal combustion engines.
Safety of Alcohol Fuel
When compared to petrol and diesel, the four major alcohol fuels have a higher octane rating, which increases their fuel efficiency. However, they have a lower energy density, which can be a drawback. Methanol and ethanol, in particular, can be derived from fossil fuels, biomass, or carbon dioxide and water.
Ethanol is the most common type of alcohol fuel and is often blended with gasoline to create a mix that releases fewer emissions into the environment. This blend is considered cleaner and helps keep the car in better shape by increasing the octane rating of the fuel. It is also accepted by the people, governments, and car companies due to its many benefits, including being water-soluble, biodegradable, and easy to clean up in the event of a spill.
Methanol, on the other hand, is a simpler molecule that can be produced from biomass or carbon dioxide and water. It has been used as racing fuel and has the potential to be a future biofuel. However, it is essential to note that methanol is highly corrosive and toxic, which can be a safety concern.
Propanol and butanol are less toxic and less volatile than methanol, making them safer alternatives. Butanol, in particular, has a high flashpoint of 35°C, which is beneficial for fire safety.
In terms of emissions, alcohol-based fuels generally lead to an increase in CO and HC emissions but a decrease in NOx emissions. They also have anti-knock qualities and better combustion efficiency due to their high latent heat of vaporization and oxygen content.
Overall, alcohol fuels have been recognized by governments and automobile manufacturers for their benefits, and efforts are being made to integrate them into everyday use.
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Alcohol fuel production
Alcohol fuel, or ethanol, is an important fuel for the operation of internal combustion engines used in cars, trucks, and other machinery. Ethanol was first isolated from wine in approximately 1100 and was found to burn shortly after. The basic steps for large-scale production of ethanol are microbial (yeast) fermentation of sugars, distillation, dehydration, and denaturing (optional).
Ethanol can be produced from biological material through fermentation processes. It is most commonly produced through the fermentation of sugars, particularly from corn kernels, sugarcane, corn grain, and switchgrass. However, it can also be produced from vegetative material, wood waste, and even genetically engineered E. coli bacteria. Second-generation processes are being developed to improve ethanol production, such as using enzymes and yeast fermentation to convert plant cellulose into ethanol or employing pyrolysis to convert the entire plant into bio-oil or syngas.
Other types of alcohol fuel include methanol, propanol, and butanol. Methanol is most often produced from natural gas or biomass, while propanol and butanol are less commonly used as direct fuel sources for petrol engines. Butanol has a higher combustion energy density than ethanol, and companies like Butalco GmbH are working on technologies to modify yeasts to produce butanol instead of ethanol.
Alcohol fuels have several advantages. They have a high octane rating, which increases fuel efficiency. Additionally, they produce fewer toxic emissions and reduce NOx, CO, and HC. Alcohol fuels also have a better "fuel economy" in terms of distance per volume, such as kilometers per liter or miles per gallon. However, one disadvantage is that pure ethanol contains only 2/3 the energy of an equivalent volume of pure gasoline, requiring engine modifications to meter the increased fuel volume.
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Frequently asked questions
Alcohol fuel is a renewable energy source that can be derived from fossil fuels, biomass, or carbon dioxide and water. It has been used to power cars, trucks, and other machinery for over a hundred years. The most common type of alcohol fuel is ethanol, which can be produced by fermenting sugar solutions, such as corn starch or sugarcane. Other types of alcohol fuel include methanol and butanol, which can be produced from biomass or fossil fuels. Alcohol fuels have a higher octane rating than gasoline, which increases their fuel efficiency and makes them a desirable alternative to traditional fossil fuels.
Alcohol fuel offers several advantages over traditional gasoline. Firstly, it is a renewable energy source, which helps reduce our reliance on non-renewable fossil fuels. Secondly, alcohol fuels have a higher octane rating, which improves fuel efficiency and results in comparable "fuel economy" in terms of distance per volume. Additionally, alcohol fuels produce fewer toxic emissions, such as NOx, CO, and HC, and reduce tailpipe emissions of CO2 due to their lower carbon-to-hydrogen ratio. Alcohol fuels also have safety benefits; they burn at a cooler temperature and are easier to extinguish with water-based fire extinguishers compared to gasoline.
One of the main drawbacks of alcohol fuel is its lower energy density compared to gasoline, which means more alcohol is required to generate the same amount of power. This can make cold-starting difficult, as alcohol fuels burn more slowly. Additionally, ethanol, a commonly used alcohol fuel, is subject to liquor tax laws unless it is mixed with petrol. Another concern is the compatibility of alcohol fuels with existing fuel systems and infrastructure. Finally, while alcohol fuel reduces certain emissions, it still releases pollutants, including permeation emissions (fuel soaking through pipes) and tailpipe emissions.
