Rajan Wilcox
Diesel fuel, also known as diesel oil, is a combustible liquid used as fuel for diesel engines. It is derived from crude oil through fractional distillation, consisting of hydrocarbons with carbon numbers predominantly in the range of C9–C20 and boiling points of 163–357°C (325–675°F). Diesel fuel is designed for engines that use compression ignition, named after their inventor, Rudolf Diesel, who patented the design in 1892. Diesel fuel has various grades, such as light-middle and middle distillates for high-speed engines, and heavy distillates for low and medium-speed engines. The performance criteria for diesel fuel include the cetane number, ease of volatilization, and sulfur content. While petroleum-derived diesel is common, alternative sources such as biodiesel, biomass-to-liquid, and synthetic diesel are also used.
| Characteristics | Values |
|---|---|
| Viscosity | Lower |
| Performance in cold weather | Better |
| Ignition delay | Shorter |
| Cetane rating | Higher |
| Volatility | Lower |
| Fuel efficiency | Higher |
| Maintenance requirements | Reduced |
| Lubricants | Added |
| Detergents | Added |
| Everyday driving | Suited |
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What You'll Learn
- Diesel fuel is a combustible liquid used for diesel engines
- It's derived from crude oil through fractional distillation
- Diesel fuel has several grades, such as light-middle and heavy distillates
- Synthetic diesel is made from natural gas and biomass
- Biodiesel is made from vegetable oil, animal fats, and methanol
Diesel fuel is a combustible liquid used for diesel engines
Diesel fuel, also known as diesel oil, is a combustible liquid used for diesel engines. It is a distillate fuel oil designed for use in motor vehicles with compression ignition engines. Unlike gasoline engines, diesel engines do not require spark plugs and rely on compression to burn. Diesel fuel is produced from various sources, most commonly petroleum, through the fractional distillation of crude oil. This process results in a mixture of carbon chains containing between 9 and 20 carbon atoms per molecule. The resulting diesel fuel has a higher boiling range than gasoline, typically between 160°C and 371°C.
In addition to petroleum-derived diesel, synthetic diesel, or Fischer-Tropsch diesel, can be produced from natural gas, synthesis gas derived from coal, or biogas obtained from biomass. Synthetic diesel generally consists mainly of paraffins with low sulfur and aromatics content. It is often blended with petroleum-derived diesel to modify its viscosity. Biodiesel, another alternative diesel fuel, can be produced from vegetable oil, animal fats, or oily plants such as soybean or oil palm. These alternative fuels offer a way to reduce dependence on petroleum and lower emissions, with biodiesel providing a life cycle carbon dioxide benefit.
Diesel fuel is classified into different grades based on the type of engine it fuels. Higher-grade diesel fuels, designed for high-speed engines like trucks and automobiles, have better ignition characteristics and are more volatile. On the other hand, lower-grade diesel fuels, intended for low-speed engines, are less volatile, leave more carbon residue, and typically have higher sulfur content. Sulfur in diesel fuel is a critical pollutant that contributes to air pollution and has been heavily regulated in recent years. As a result, ultra-low-sulfur diesel (ULSD) has become the standard in many countries, including the United States, the United Kingdom, mainland Europe, and North America.
The performance of diesel fuel can be adjusted by mixing it with various additives. However, two main challenges are associated with additives in diesel fuel: maintaining injector nozzle cleanliness and preventing gelling in cold weather. Diesel fuel is also used in diesel-engine generators to generate electricity in remote locations and as backup power in hospitals, industrial facilities, and large buildings. The pricing of diesel fuel varies across different countries and regions, influenced by factors such as demand, local regulations, and taxes.
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It's derived from crude oil through fractional distillation
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is derived from crude oil through fractional distillation. Fractional distillation is a process used in oil refineries to separate crude oil into useful substances known as fractions, which have different hydrocarbons and boiling points. The process involves heating the oil to various temperatures to vaporize and separate its component parts. Crude oil, which is specifically drilled from the ground, is refined into various petroleum products through fractional distillation, including internal combustion engine fuels such as petrol and diesel.
The most common type of diesel fuel is derived from petroleum, which is produced by the fractional distillation of crude oil between 200 and 350 °C at atmospheric pressure. This results in a mixture of carbon chains typically containing between 9 and 25 carbon atoms per molecule. This fraction is then subjected to hydrodesulfurization to remove sulfur, which can cause air pollution emissions that are harmful to human health.
The design and operation of fractionation towers in the oil refining industry are largely based on empirical calculations and equations. The two main types of distillation columns used are tray and packing columns, with tray columns being the more common choice for separating petroleum fractions. The distillates produced during fractional distillation are often grouped based on similar characteristics, such as density and flashpoint. Diesel fuel falls under the category of "'middle distillates,'" which are formed lower down the columns and have higher flashpoints than 42°C.
While petroleum-derived diesel, also known as petrodiesel, is the most prevalent, alternative sources for diesel fuel production are being developed and adopted. These include biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel, with biodiesel being derived from vegetable oil or animal fats. Synthetic diesel is another option, produced from carbonaceous precursors like natural gas through the Fischer-Tropsch process.
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Diesel fuel has several grades, such as light-middle and heavy distillates
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel 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 injection of fuel. Diesel fuel is most commonly derived from fractional distillates of petroleum fuel oil, but alternative sources such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel are becoming more prevalent.
Diesel fuel has various grades, including light, middle, and heavy distillates. Middle distillates, also known as gasoil, primarily consist of extra light heating oil, diesel fuel, marine diesel oil, and jet fuel. They are produced in refineries through the distillation of crude oil, separating it into its constituent parts. Middle distillates are clear, colourless to light yellow flammable liquids with a defined range of physical properties, including carbon atom count and density.
Light distillates, such as No. 1 diesel fuel, are used in on-highway diesel engines like those found in trucks and automobiles. They have distillation temperatures of 550 degrees Fahrenheit at the 90% point and meet the specifications outlined in ASTM Specification D 975. No. 1 distillate can also be used as a fuel oil for portable outdoor stoves and heaters.
Heavy distillates, on the other hand, include No. 2 diesel fuel, which is used in high-speed diesel engines such as those in railroad locomotives, trucks, and automobiles. No. 2 diesel fuel has a higher distillation temperature of 640 degrees Fahrenheit at the 90% recovery point and adheres to ASTM Specification D 975. Additionally, No. 2 fuel oil, also known as heating oil, falls under the category of heavy distillates. It is used for domestic heating or moderate-capacity commercial/industrial burner units and complies with ASTM Specification D 396.
The distinction between light and heavy distillates is based on the molecular weight of the fuel, with diesel fuel grades ranging from lighter to heavier molecular weights relative to other fuels like gasoline and kerosene.
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Synthetic diesel is made from natural gas and biomass
Diesel fuel is a liquid fuel designed for use in diesel engines, which are internal combustion engines that use compression, rather than spark plugs, for fuel ignition. The most common type of diesel fuel is derived from petroleum, but alternative sources are increasingly being developed and adopted. These include biodiesel, biomass-to-liquid (BTL) diesel, and gas-to-liquid (GTL) diesel.
Synthetic diesel is a type of diesel fuel that can be produced from various carbon-bearing feedstocks, including natural gas, coal, and biomass. Natural gas is the most important feedstock for synthetic diesel production. In the synthetic diesel production process, raw materials are converted into synthesis gas, also known as syngas, which is a mixture of carbon monoxide and hydrogen. This synthesis gas is then converted into synthetic diesel through the Fischer-Tropsch process, which was first developed in the 1920s in Germany. The Fischer-Tropsch process involves the use of a catalyst to transform syngas into liquid products, primarily diesel fuel and jet fuel, as well as potentially waxes.
The use of natural gas as a feedstock for synthetic diesel production is referred to as gas-to-liquid (GTL) technology. GTL plants are particularly suitable for regions with ample low-cost gas resources, such as the Middle East, West Africa, and the North Slope in Alaska. However, the commercialization of synthetic fuels produced from natural gas may be limited by their similar greenhouse gas emissions compared to petroleum diesel.
Biomass is another important feedstock for synthetic diesel production, known as biomass-to-liquid (BTL) technology. The process of converting biomass into biofuels typically involves thermochemical conversion using well-established technologies such as gasification and the Fischer-Tropsch synthesis. Second-generation biomass sources, such as switchgrass or woody biomass, can undergo pyrolysis to produce a bio-oil, which is then catalytically stabilized and deoxygenated to create a renewable synthetic paraffinic kerosene jet fuel. The use of biomass as a feedstock has the potential to significantly reduce lifecycle greenhouse gas emissions compared to conventional petroleum-derived fuels.
In conclusion, synthetic diesel is made from natural gas and biomass through processes such as the Fischer-Tropsch synthesis, gasification, and pyrolysis. These processes convert carbonaceous feedstocks into synthesis gas, which is then transformed into synthetic diesel, offering the potential for reduced environmental impact and increased fuel availability.
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Biodiesel is made from vegetable oil, animal fats, and methanol
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel designed for use in diesel engines, which rely on compression rather than spark-induced ignition to burn. Rudolf Diesel, the German engineer who invented the diesel engine, originally considered using vegetable seed oil as fuel, which eventually contributed to biodiesel production and use today.
Biodiesel is a substitute for fossil diesel and can be used pure or blended with petroleum diesel. It is produced from vegetable oils, waste cooking oils, animal fats, and methanol. The process of converting these raw materials into biodiesel is called transesterification, which uses a catalyst, such as sodium or potassium hydroxide, to transform the fats and oils into biodiesel and glycerin. Approximately 100 pounds of oil or fat are reacted with 10 pounds of a short-chain alcohol, typically methanol, to produce 100 pounds of biodiesel and 10 pounds of glycerin.
Vegetable oils and animal fats have similar chemical structures, mainly composed of triglycerides. However, the use of vegetable oils for biodiesel production has raised questions about sustainability. Animal fats have been found to have certain advantages over vegetable oils in biodiesel production, such as lower nitrogen oxide (NOx) emission levels.
Mixtures of animal fats and vegetable oils have been studied for their potential to reduce production costs and environmental impact. These mixtures have been shown to meet the European biodiesel quality standard EN 14214. The use of waste frying oil, in particular, has been suggested as a more sustainable and cost-effective alternative to virgin vegetable oils.
Overall, biodiesel production from vegetable oils, animal fats, and methanol offers a feasible and renewable alternative to fossil diesel, with potential benefits for the environment and engine performance.
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Frequently asked questions
Diesel Fuel #1 is a type of diesel fuel that is more refined and thinner than Diesel Fuel #2. It has a lower gel point, making it better for cold weather as it prevents the fuel from gelling.
Diesel Fuel #1 has added detergents and lubricants, which help keep fuel systems clean and extend the life of fuel pumps and other components. It also has a shorter ignition delay, reducing wear on engine batteries and maintenance requirements.
Diesel Fuel #1 is ideal for everyday driving and regular vehicles, especially in cold climates. It is also suitable for those who drive in regions with harsh winter conditions, as it ensures reliable engine performance.
