Regan Brown
Diesel fuel, also known as diesel oil, is a liquid fuel that is specifically designed for diesel engines. It is a complex mixture of hydrocarbons derived from crude oil through fractional distillation, with a boiling point range of approximately 163–357 °C. The chemical formula for diesel is approximated as C nH 2n, with the most common formula being C12H23. Diesel fuel is a high-volume product of oil refineries and is widely used in vehicles such as trucks, buses, and military equipment.
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What You'll Learn
Diesel fuel is a complex mixture of hydrocarbons
The chemical formula for diesel is generally accepted to be C nH 2n, with diesel fuel created from carbon and hydrogen chains that emerge at temperatures between 200°C and 380°C. Diesel fuel is derived from crude oil through fractional distillation, with a boiling point range of 163–357 °C. It is a mixture of aliphatic, olefinic, naphthenic, and aromatic hydrocarbons.
Diesel fuel No. 1 is a straight-run middle distillate with a boiling range consistent with that of kerosene. It contains branched-chain alkanes (paraffins), cycloalkanes (naphthenes), aromatics, and mixed aromatic cycloalkanes. Diesel No. 1 has a chemical composition that largely eliminates the presence of benzene and polycyclic aromatic hydrocarbons (PAHs).
Diesel fuel No. 2 is a blend of straight-run and catalytically cracked streams, including straight-run kerosene, straight-run middle distillate, hydrodesulfurized middle distillate, and light catalytically cracked distillate. It contains normal and branched-chain alkanes (paraffins), cycloalkanes (naphthenes), aromatics, and mixed aromatic cycloalkanes. Due to the presence of cracked stocks in one or more of its blend streams, it also contains olefins and mixed aromatic olefin types such as styrenes.
In the United States, petroleum-derived diesel is composed of about 75% saturated hydrocarbons (mainly paraffins) and 25% aromatic hydrocarbons. The average chemical formula for common diesel fuel is C12H23, ranging from C10H20 to C15H28.
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It is derived from crude oil through fractional distillation
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel specifically designed for diesel engines. Diesel fuel is derived from crude oil through fractional distillation.
Fractional distillation is a process used to separate a mixture into its component parts, or fractions. It involves heating a mixture to a temperature at which one or more fractions of the mixture will vaporize. The process is used in oil refineries to separate crude oil into useful substances with different hydrocarbons and boiling points. Crude oil is placed into a distillation tower and heated to over 400°C. As the oil is heated, different chains of hydrogen and carbon atoms (hydrocarbons) begin to separate. Diesel fuel emerges between temperatures of 200°C and 380°C and is collected on distillation plates, which then siphon the fuel to a holding tank.
The distillates produced through fractional distillation vary based on their density and form at different stages of the fractionating column. The least dense gases are at the top, while the denser heavy fuels and bitumen are at the bottom. Diesel fuel is a middle distillate, formed lower in the column with a flashpoint higher than 42°C. Other middle distillates include kerosene, jet fuel, and gas oil.
The chemical formula for diesel fuel is approximately C12H23, ranging from C10H20 to C15H28. It consists mainly of aliphatic and aromatic hydrocarbons with a boiling point range of 163–357°C. Diesel fuel contains more carbon atoms than gasoline, which usually has the formula C9H20. The carbon and hydrogen atoms in diesel fuel form chains, rings, or a combination of both.
Diesel fuel is a high-volume product of oil refineries and is standardized in many countries. It is derived from petroleum, but alternative sources such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel are also being developed.
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Diesel fuel has a higher melting point than gasoline
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel specifically designed for diesel engines. These engines are a type of internal combustion engine in which fuel ignition occurs without a spark due to the compression of inlet air and the subsequent injection of fuel. Rudolf Diesel, a German scientist and inventor, created the first diesel engine prototype around 1892.
Diesel fuel is derived from crude oil through fractional distillation, a process where crude oil is heated to over 400°C in a distillation tower, separating its components based on their different boiling temperatures. Diesel fuel is created at the lower end of the tower, with a boiling point range of approximately 163-357°C. It consists mainly of aliphatic and aromatic hydrocarbons, with carbon numbers predominantly ranging from C9 to C20.
The higher melting point of diesel fuel can pose challenges in colder climates, as it tends to gel or solidify at low temperatures. To address this issue, additives such as kerosene can be used to reduce the fuel's viscosity and decrease its tendency to gel. Additionally, diesel engines may require an engine block heater to start in cold weather conditions.
Diesel fuel is commonly used in heavy trucks, school buses, construction machines, public buses, trains, boats, military vehicles, and generators. Its higher melting point and lower flammability compared to gasoline make it a preferred choice for military applications.
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It is less flammable and less prone to stalling than gasoline
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel designed for use in diesel engines. Diesel engines are more efficient than gasoline engines, reaching 40% efficiency or higher, compared to 20% efficiency for gasoline engines. This is because diesel is much less flammable than gasoline. While gasoline vapours can be ignited with a small spark, diesel requires intense pressure or a sustained flame to ignite.
The chemical composition of diesel fuel is primarily a mixture of aliphatic and aromatic hydrocarbons, with a boiling point range of approximately 163–357 °C. The average chemical formula for common diesel fuel is C12H23, ranging from C10H20 to C15H28. Diesel fuel typically freezes at temperatures below -8.1 °C.
In terms of flammability, diesel is considered combustible but not explosive. It produces less flammable fumes than petrol, making it a safer option. Gasoline, on the other hand, is highly volatile and explosive, with even the fumes from a gas can being exposed to flames posing a risk of explosion.
Diesel engines also have turbochargers, which pump more air into the combustion chambers, allowing them to perform better at high altitudes. This makes diesel a popular choice for heavy vehicles like trucks, as it provides more torque and is less prone to stalling. The increased torque in diesel engines is due to their higher angular momentum of release, which provides more force to get the vehicle rolling.
While diesel engines are less likely to stall, it's important to note that the ease of stalling also depends on other factors such as engine size, clutch size and type, and driving conditions. Small engines, for example, are generally easier to stall, regardless of whether they are diesel or gasoline. Additionally, the design of the clutch pedal and its linkage to the clutch release mechanism can impact the likelihood of stalling.
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Diesel fuel can be petroleum-based or non-petroleum-based
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel designed for use in diesel engines. Diesel engines are a type of internal combustion engine where fuel ignition occurs without a spark due to the compression of inlet air and the subsequent injection of fuel. Diesel fuel is typically characterised by its good compression ignition characteristics and high torque capabilities.
Non-petroleum-based diesel fuels, such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel, are increasingly being developed and adopted as alternatives. These fuels offer a more sustainable option by utilising renewable resources. Biodiesel, for example, is typically produced from vegetable oils or animal fats and can be used in pure form or blended with petrodiesel. It has a higher flash point than petrodiesel, making it safer but also unsuitable for spark-ignition engines.
The chemical composition of diesel fuel can vary depending on the specific type and blend of the fuel. Generally, diesel fuel consists of a complex mixture of hydrocarbons, including aliphatic, olefinic, naphthenic, and aromatic hydrocarbons. The presence of paraffins (alkanes) in diesel contributes to its gelling behaviour at low temperatures, while aromatics form ring-like structures with their carbon atoms. The specific types and ratios of these hydrocarbons can differ between diesel fuel types and regions.
Diesel fuel has various colloquial names and designations depending on the region. In the United States, diesel fuel is often referred to simply as diesel, while in the United Kingdom, it may be called white diesel or red diesel, with the latter denoting an agricultural-only product with reduced tax. In Australia, diesel fuel is known as distillate, while in Indonesia, Israel, and the Middle East, it is commonly referred to as Solar, a trademarked name. Despite the varying names, diesel fuel plays a significant role in transportation, construction, and military applications worldwide.
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Frequently asked questions
Diesel fuel, also called diesel oil, heavy oil or simply diesel, is a liquid fuel made from the byproduct of petroleum. It is a complex mixture of aliphatic, olefinic, naphthenic and aromatic hydrocarbons. Its chemical formula is approximately C12H23, ranging from C10H20 to C15H28.
Diesel fuel is derived from crude oil through fractional distillation. It is heated to over 400°C in a distillation tower, which separates the different components with varying boiling temperatures.
Diesel fuel is primarily used in diesel engines, which are found in school buses, construction machines, public buses, trucks, trains, boats, military vehicles, and generators.
