Regan Brown
Diesel fuel is a mixture of hydrocarbons obtained by refining and distilling crude oil. The refining process involves heating the viscous liquid to over 400 degrees Celsius, turning it into a vapour that enters a fractional distillation tower. As the vapour rises and cools, it condenses into liquids that are captured at different levels of the tower. Diesel fuel emerges when the vapour cools down to between 200 and 350 degrees Celsius. The distillation process extracts shorter hydrocarbon chains, which are then siphoned off into a diesel holding tank. This process converts the dark, thick crude oil into the much lighter diesel fuel that is used in diesel engines.
| Characteristics | Values |
|---|---|
| What is diesel fuel refined from | Crude oil, biomass materials, vegetable seed oil, vegetable oil, animal fats |
| Crude oil refining process | Heating the viscous liquid to over 400 degrees Celsius to turn it into a vapour, which then enters a fractional distillation tower |
| Diesel fuel emerges | When the vapour reaches between 200 and 350 degrees Celsius |
| Hydrocarbons | Chains of hydrogen and carbon of varying lengths |
| Hydrocarbon chains | Longer chains have a higher boiling point than shorter chains |
| Hydrotreating | A commonly used upgrading process for diesel fuel that involves chemical reactions with hydrogen |
| Hydrocracking | A refinery stream that contributes to diesel fuel |
| Synthetic diesel | Can be produced from carbonaceous precursors like natural gas |
| Biodiesel | Made from biolipids like vegetable oil or animal fats, and can be used as a mix with diesel |
| Sulphur | Ultra-low-sulphur diesel (ULSD) is a type of diesel fuel with a sulphur content of 15 parts per million or less |
| Cetane number | A property used to characterise diesel fuel |
| Fuel volatility | A property used to characterise diesel fuel |
| Density | A property used to characterise diesel fuel |
| Viscosity | A property used to characterise diesel fuel |
| Low-temperature operability | A property used to characterise diesel fuel |
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What You'll Learn
Crude oil distillation
Crude oil is a naturally occurring liquid composed of thousands of compounds with different properties, each with a different boiling point. Diesel fuel is one of the many products derived from refining crude oil.
The process of refining crude oil into diesel fuel begins with heating the viscous liquid to over 400 degrees Celsius. This heating process turns the liquid crude oil into vapour. The vapour then enters a fractional distillation tower, where it starts to cool down. As the vapour rises in the tower, it reaches different temperature points, and the hydrocarbon chains within it return to a liquid state. The distillation tower has plates that capture these liquids as they emerge. The longest hydrocarbon chains have a boiling point of over 400 degrees Celsius and emerge as asphalt or bitumen at the bottom of the tower. As the vapour rises, shorter hydrocarbon chains begin to liquefy. When the vapour cools down below 350 to 370 degrees Celsius, diesel fuel begins to emerge. The vapour collects on the distillation plates and is siphoned off into a diesel holding tank.
The distillation process extracts shorter hydrocarbon chains as the vapour rises higher in the tower. The shortest chains emerge at the top as a vapour gas. Another method for creating diesel fuel is to recombine specific proportions of these shorter hydrocarbon chain distillates. Additives are then blended into the diesel fuel before it is ready for sale.
The simplest refineries stop the distillation process after separating the crude oil into its various components. However, more complex refineries may further process the lower-value heavy fractions into lighter, higher-value products. This process, known as cracking, involves using heat, pressure, catalysts, and sometimes hydrogen to break down heavy hydrocarbon molecules into lighter ones.
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Hydrocarbon chains
Diesel fuel is a distillate fuel oil designed for use in diesel engines, which are internal combustion engines that use compression, rather than a spark, to ignite the fuel. Diesel fuel is produced by refining crude oil, a naturally occurring liquid that is made up of various kinds of hydrocarbons, or chains of hydrogen and carbon.
The first step in refining crude oil is to heat the viscous liquid to over 400 degrees Celsius, turning it into a vapour. This vapour then enters a fractional distillation tower, where it cools down and the hydrocarbon chains within it return to a liquid state. The length of a hydrocarbon chain determines its boiling point, with longer chains having higher boiling points. As the vapour rises in the tower, it cools further, and shorter hydrocarbon chains liquefy. Distillates are captured at different levels of the tower, with longer chains emerging as asphalt or bitumen at the bottom, and shorter chains emerging as fuel oil in the middle. When the vapour reaches between 200 and 350 degrees Celsius, diesel fuel begins to emerge. The distillation process extracts shorter and shorter hydrocarbon chains as the vapour rises, with the shortest chains emerging at the top as a vapour.
The distillates that emerge from the fractional distillation tower can be recombined to create diesel fuel. This involves combining specific proportions of shorter hydrocarbon chain distillates. The resulting diesel fuel is then ready to have additives blended in before being sold.
Diesel fuel can also be created through the use of alternative feedstocks, such as biomass-based diesel fuels. In the United States, diesel fuel is typically composed of about 75% saturated hydrocarbons and 25% aromatic hydrocarbons. The average chemical formula for common diesel fuel is C12H23, ranging from C10H20 to C15H28.
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Diesel fuel extraction
Diesel fuel is a distillate fuel oil designed for use in diesel engines, which are internal combustion engines that use compression, rather than spark ignition. Diesel fuel is denser than petrol and contains about 15% more energy by volume.
Diesel fuel is primarily refined from crude oil, which is a naturally occurring liquid comprising various types of hydrocarbons. The refining process involves heating the viscous crude oil to over 400 degrees Celsius, turning it into a vapour. This vapour then enters a fractional distillation tower, where it cools and the hydrocarbon chains return to a liquid state. Distillation plates capture the liquids as they emerge at different levels of the tower. As the chains enter, they begin to turn back into liquids, with the longest chains emerging as asphalt or bitumen at the bottom. As the vapour rises, it cools further and shorter hydrocarbon chains liquefy. When the vapour reaches between 200 and 350 degrees Celsius, diesel fuel begins to emerge and is siphoned off into a holding tank. The distillation process extracts shorter hydrocarbon chains as the vapour rises.
The shortest hydrocarbon chains emerge at the top as a vapour, which can be recombined to create diesel fuel. This diesel fuel is then ready for additives and sale. The refining process can be adjusted to balance refinery production patterns with market demands, with large hydrocarbon molecules broken into smaller ones through the application of heat, pressure, or catalysts. Techniques such as thermal cracking, catalytic cracking, and hydrocracking are used to increase the yield of desired products.
An alternative method of diesel fuel extraction involves the use of biomass materials. Biodiesel is obtained from vegetable oil or animal fats, which are mainly fatty acid methyl esters (FAMEs). These FAMEs are transesterified with methanol, using catalysts such as sodium or potassium hydroxide. The process results in biodiesel and byproducts like glycerine and water, which are removed. Biodiesel can be used pure or as a blend with diesel fuel. Other alternative sources of diesel fuel include biomass-to-liquid (BTL) and gas-to-liquid (GTL) diesel.
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Diesel fuel additives
Diesel fuel is a mixture of hydrocarbons obtained by the distillation of crude oil. Crude oil is heated to over 400 degrees Celsius, turning it into a vapour that rises up a fractional distillation tower. As the vapour cools, it liquefies into various petroleum products, including diesel fuel, which emerges when the vapour cools to between 200 and 350 degrees Celsius.
One of the main functions of diesel additives is to improve lubricity, reducing friction and wear on the fuel system. This helps to prevent excessive wear and tear, which can lead to costly repairs.
Another key role of additives is to improve and maintain fuel system cleanliness. Carbon deposits can build up on diesel injectors over time, leading to incomplete combustion and wasted fuel. Additives such as AR6500 and Diesel Extreme are designed to clean injectors and prevent carbon build-up, ensuring the engine runs efficiently.
Some additives, like Everyday Diesel Treatment, contain cetane improvers, which boost engine performance and power.
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Diesel fuel distribution
Diesel fuel is a fractional distillate of petroleum fuel oil, which is obtained through the refining of crude oil. Crude oil is a naturally occurring liquid that can be refined into various fuels and other petroleum-based products. The refining process involves heating the viscous liquid to over 400 degrees Celsius, turning it into a vapour. This vapour then enters a fractional distillation tower, where it cools down and separates into different products based on their boiling points. The longest hydrocarbon chains have a boiling point of over 400 degrees Celsius and emerge as asphalt or bitumen, while shorter chains liquefy at lower temperatures, with fuel oil emerging at around 370 degrees Celsius. Diesel fuel begins to emerge when the vapour reaches between 200 and 350 degrees Celsius.
Once the diesel fuel is refined, it needs to be distributed to consumers. In the United States, most diesel fuel moves by pipeline from refineries and ports to terminals near major consuming areas. Barges and trains are also used to transport diesel fuel to these terminals. From the terminals, trucks deliver the diesel fuel to retail service stations and large-volume consumers such as vehicle fleet operators.
The distribution of diesel fuel is carefully managed to ensure that the product meets the required specifications. As diesel fuel and other petroleum products are often sent through shared pipelines, mixing can occur. Therefore, the quality of the diesel fuel is tested as it enters and leaves the pipelines. If the product fails to meet local, state, or federal specifications, it may be returned to the refinery for further processing or sold as a different product.
The United States is a major producer and consumer of diesel fuel, with U.S. petroleum refineries producing most of the diesel fuel consumed in the country. In 2022, U.S. refineries produced about 1.75 billion barrels (73.46 billion gallons) of ultra-low-sulfur distillate (ULSD), which is the standard diesel fuel sold in the United States. While most of the diesel fuel consumed in the U.S. is produced domestically, the country also imports a small percentage of ULSD, with Canada being the main source of these imports.
The distribution of diesel fuel is an important aspect of the diesel fuel industry, ensuring that the refined product reaches consumers across the country. By utilising pipelines, barges, trains, and trucks, diesel fuel can be efficiently transported from refineries to the end-users, contributing to the country's energy needs and supporting various industries that rely on diesel-powered vehicles and equipment.
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Frequently asked questions
Diesel fuel is refined from crude oil and biomass materials. Crude oil is a naturally occurring liquid that can be refined into various fuels and other petroleum-based products.
The refining process involves heating the viscous crude oil to over 400 degrees Celsius, turning it into vapour. The vapour then enters a fractional distillation tower, where it cools and turns back into a liquid. Distillation plates capture the liquids at different levels of the tower, with the longest hydrocarbon chains turning into asphalt or bitumen and exiting at the bottom. As the vapour rises, it cools further, and shorter hydrocarbon chains liquefy, eventually forming fuel oil. Diesel fuel begins to emerge when the vapour reaches between 200 and 350 degrees Celsius.
Diesel fuel is denser than petrol and contains about 15% more energy by volume. It has specific properties such as cetane number, fuel volatility, density, viscosity, low-temperature operability, and sulfur content. These properties vary across different fuel grades and countries.
Alternatives to diesel derived from petroleum include biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel. Biodiesel is obtained from vegetable oil or animal fats, while synthetic diesel can be produced from natural gas using the Fischer-Tropsch process.
