Regan Brown
Diesel fuel is a complex mixture of hydrocarbon molecules derived from the distillation of crude oil. It is specifically designed for use in diesel engines, which are a type of internal combustion engine. The process of distillation separates the various hydrocarbons present in crude oil, which have different boiling points, and the resulting diesel fuel consists mainly of paraffins, aromatics, and naphthenes. Diesel fuel generally has a boiling point range of 150°C to 380°C, and its viscosity increases as the temperature decreases. The composition of diesel fuel can vary depending on the source of crude oil and the refining processes used. While diesel fuel typically contains hydrocarbons, other compounds such as sulfur, nitrogen, and oxygen may also be present, and these non-hydrocarbon components must be removed during refining to meet emissions standards.
| Characteristics | Values |
|---|---|
| Composition | Mixture of hydrocarbons, including aliphatic and aromatic hydrocarbons, with carbon numbers predominantly in the range of C9–C20 |
| Boiling Point Range | 150 °C to 380 °C, specifically 163 °C to 357 °C for diesel fuel |
| Distillation | Obtained by distillation of crude oil, with the final product being a blend of conversion products and primary distillation streams |
| Cetane Number | Affects the fuel ignition delay period and self-ignition temperature properties |
| Fuel Volatility | Dependent on the type of crude oil used and the distillation process |
| Density | Higher densities in aromatic hydrocarbons result in higher energy content per unit volume |
| Viscosity | Modified by blending with kerosene, increases as temperature decreases |
| Low-Temperature Operability | Poor low-temperature properties of paraffinic hydrocarbons |
| Sulfur Content | Low sulfur content in synthetic diesel, while petroleum-derived diesel contains impurities such as sulfur compounds |
| Other Compounds | Small amounts of nitrogen, oxygen, and other heteroatoms; non-hydrocarbon compounds like dibenzothiophene and carbazole |
| Alternative Sources | Biodiesel, biomass to liquid (BTL), gas to liquid (GTL) diesel, and synthetic diesel from natural gas |
| Engine Type | Designed for diesel engines, which are compression-ignition engines without spark plugs |
| Efficiency | Higher fuel efficiency and lower CO2 emissions compared to spark-ignition engines |
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What You'll Learn
Diesel fuel is a mixture of hydrocarbons
In the United States, petroleum-derived diesel is composed of about 75% saturated hydrocarbons (primarily paraffins, including n, iso, and cycloparaffins) and 25% aromatic hydrocarbons (including naphthalenes and alkylbenzenes). The average chemical formula for common diesel fuel is C12H23, ranging from C10H20 to C15H28. Diesel fuel contains hydrocarbons with approximately 12–20 carbon atoms and a boiling range between 170 and 360 °C.
The refining process converts crude oil into transportation fuels, including gasoline, jet fuel, and diesel fuel. Diesel fuel is specifically designed for use in diesel engines, which are a type of internal combustion engine. Diesel engines have higher fuel efficiency and lower CO2 emissions compared to spark-ignited petrol engines. However, diesel fuel contains more pollutants that must be extracted to achieve the same emissions level as petrol.
Diesel fuel is also known as diesel oil, heavy oil, or simply diesel. It is classified based on the type of engine it fuels, ranging from 1-D to 4-D. Diesel fuel is a high-volume product of oil refineries and is standardized in many countries, such as the European Union, where the standard is EN 590.
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Crude oil distillation
Crude oil is a mixture of hydrocarbons with different densities. The process of fractional distillation is used to separate the different hydrocarbons in crude oil into useful fractions, which are then converted into petroleum products.
The distillates obtained from crude oil include petrol, diesel, gas oil, kerosene, jet fuel, heating oil, and lubricating oil. Diesel fuel is a mixture of hydrocarbons obtained from the distillation of crude oil, with boiling points ranging from 150-380 °C. It is specifically designed for use in diesel engines, a type of internal combustion engine. Diesel fuel is composed of about 75% saturated hydrocarbons and 25% aromatic hydrocarbons. The average chemical formula for diesel fuel is C12H23, ranging from C10H20 to C15H28.
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Diesel fuel characteristics
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a mixture of hydrocarbons derived from the distillation of crude oil. It is specifically designed for use in diesel engines, which are internal combustion engines that use compressed inlet air and fuel injection for ignition without a spark. Diesel fuel has several important characteristics that are essential for its effective use in modern engines.
One key characteristic of diesel fuel is its high energy content, which provides more power to the engine, resulting in increased efficiency and reduced fuel consumption. The heat value of diesel fuel is measured in British Thermal Units (BTUs) per gallon, with Number 2 diesel having a higher heat value than Number 1 diesel.
Another important characteristic is the cetane rating, which indicates the ignition quality of the fuel. Higher cetane ratings result in shorter lag times between fuel entering the combustion chamber and ignition. Cetane rating requirements depend on various factors, including engine size, design, load, and atmospheric conditions.
The viscosity of diesel fuel is also crucial. Viscosity refers to the resistance of the fuel to flow, and it decreases as temperature increases. High viscosity can lead to issues such as hard starting and white smoke. In cold climates, diesel fuel tends to have higher viscosity and can even gel, affecting its ability to flow in fuel systems. To address this, special low-temperature diesel contains additives to keep it liquid at lower temperatures.
The sulfur content of diesel fuel has received attention due to its impact on engine components. Sulfur, combined with hydrogen sulfide and sulfur dioxide/trioxide formed during combustion, can cause increased wear and corrosion. Additionally, the presence of water and sediment in diesel fuel can lead to rusting and damage to fuel system components.
Diesel fuel also contains ash-forming materials, such as abrasive solids and soluble metallic soaps, which contribute to engine deposits and wear. The amount of ash is determined by burning a measured amount of fuel and expressing the weight of the remaining ash as a percentage of the original fuel sample.
In summary, diesel fuel is a complex mixture of hydrocarbons with specific characteristics that are crucial for its performance in diesel engines. These characteristics include heat value, cetane rating, viscosity, sulfur content, corrosion tendency, and ash content. Maintaining and optimising these characteristics ensures the effective operation of modern diesel engines.
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Diesel engine efficiency
Diesel fuel is a mixture of hydrocarbons obtained by distillation of crude oil. It is a complex mixture derived from crude oil through fractional distillation, consisting mainly of aliphatic and aromatic hydrocarbons with a boiling point range of approximately 150–380 °C. The distillates heavier than kerosene derived by atmospheric distillation of crude oil are the gas oil streams, which are the main blending components for diesel fuel production.
Diesel engines are widely recognised for their efficiency and reliability under heavy loads, making them the preferred choice for industries that rely on long-haul drives and high-torque applications. Diesel engines have an average fuel efficiency of 20–35% more than older engines, and fuel efficiency ratings have continued to improve due to re-engineering of engine design with fuel injection systems, improved management systems, and turbocharging capabilities.
The fuel density of a diesel engine can range from 13 to 18% more than a gasoline engine, and diesel vehicles can travel 20% to 35% farther on a single gallon of fuel than similarly-sized gasoline vehicles. Diesel engines excel in long-haul or highway driving due to their higher torque, which contributes to better fuel efficiency and faster acceleration.
Diesel engines were originally used as a more efficient replacement for stationary steam engines, and they have been used in submarines and ships since the 1910s. They were first developed by Rudolf Diesel, who was inspired by the Carnot cycle's ability to convert much more heat energy into work through isothermal change. Diesel engines are designed with either two-stroke or four-stroke combustion cycles, and they work by compressing only air, or air combined with residual combustion gases from the exhaust (known as exhaust gas recirculation, or EGR).
Overall, diesel engines are known for their efficiency, and advancements in engine design and technology continue to improve their fuel efficiency and environmental impact.
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Diesel fuel alternatives
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a complex mixture of hydrocarbon molecules derived from the distillation of crude oil. It is specifically designed for use in diesel engines, which are a type of internal combustion engine. While diesel fuel primarily consists of hydrocarbons, it also contains small amounts of sulfur, nitrogen, and oxygen, known as "heteroatoms".
Due to the complex nature of diesel fuel and its specific use in diesel engines, finding suitable alternatives can be challenging. However, there are several alternative fuels that can be considered:
Vegetable Oil and Biodiesel
Vegetable oil, such as recycled cooking oil or filtered veggie oil, can be used as a diesel fuel alternative, particularly in older diesel engines. However, it is important to properly filter and process the vegetable oil to avoid damaging the fuel system. Biodiesel, which is a refined form of vegetable oil, is another option but may require more effort in terms of work and storage.
Renewable Diesel
Renewable diesel, previously known as green diesel, is a biomass-derived fuel suitable for use in diesel engines. It is produced from fats, oils, and greases, such as soybean oil or canola oil, through various technology pathways like hydrotreating, biological sugar upgrading, and catalytic conversion of sugars. Renewable diesel meets the conventional petroleum ASTM D975 specification, allowing its use in existing diesel engines and infrastructure. It also reduces carbon dioxide and nitrogen oxide emissions compared to petroleum diesel.
Synthetic Diesel
Synthetic diesel can be produced from various carbonaceous precursors, with natural gas being the most important source. The raw materials are converted into synthesis gas, which is then transformed into synthetic diesel using the Fischer-Tropsch process. Synthetic diesel is primarily composed of paraffins with low sulfur and aromatics content, and it is often blended with petroleum-derived diesel.
Hydrogen
Hydrogen is a potentially emissions-free alternative fuel that can power fuel cell electric vehicles. It can be produced from renewable resources, offering a sustainable option for the future.
Natural Gas and Propane
Natural gas and propane are also viable alternatives to diesel fuel. Natural gas can provide significant cost advantages over gasoline and diesel fuels, while propane has been widely used in vehicles worldwide for decades.
It is important to note that the compatibility of these alternative fuels with diesel engines may vary, and modifications may be necessary. Additionally, the availability and cost of these alternatives can fluctuate based on location, time, and global market conditions.
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Frequently asked questions
Diesel fuel is a mixture of hydrocarbons obtained by distillation of crude oil. It is specifically designed for use in a diesel engine, a type of internal combustion engine.
Yes, diesel fuel is a complex mixture of hydrocarbon molecules. It is derived from crude oil through fractional distillation and consists mainly of aliphatic and aromatic hydrocarbons with a boiling point range of approximately 150°C to 380°C.
Diesel fuel is characterized by its cetane number, fuel volatility, density, viscosity, low-temperature operability properties, and sulfur content. It contains more energy per litre than petrol and has a higher fuel efficiency, resulting in lower CO2 emissions.
Diesel fuel is produced by distilling crude oil, which separates the different hydrocarbons based on their boiling temperatures. The distilled diesel may be blended with other refinery streams to increase production and modify its viscosity.
