Regan Brown
Diesel fuel, also known as diesel oil, is a mixture of hydrocarbons obtained from the distillation of crude oil. It is specifically designed for use in diesel engines, which are a type of internal combustion engine that uses compression to ignite the fuel without a spark. Diesel fuel consists mostly of saturated hydrocarbons (primarily paraffins) and aromatic hydrocarbons, with a typical chemical formula of C12H23. The distillation process separates crude oil into various products, including gasoline, diesel, and residual fuel oil. Diesel fuel's characteristics, such as cetane number, fuel volatility, and viscosity, vary depending on its grade and the country's specifications. The development of alternative diesel fuels, such as biodiesel and synthetic diesel, showcases the ongoing evolution of diesel technology beyond traditional petroleum-derived sources.
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What You'll Learn
- Diesel fuel is a mixture of hydrocarbons obtained by distillation of crude oil
- It is composed of about 75% saturated hydrocarbons and 25% aromatic hydrocarbons
- Paraffinic hydrocarbons improve ignition quality but have poor low-temperature properties
- Aromatics may lead to carcinogenic compounds in exhaust gases
- Synthetic diesel is produced from carbonaceous precursors, with natural gas being most important
Diesel fuel is a mixture of hydrocarbons obtained by distillation of crude oil
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a mixture of hydrocarbons obtained by distillation of crude oil. It is specifically designed for use in diesel engines, which are internal combustion engines that use compression to ignite the fuel without a spark. The most common type of diesel fuel is a fractional distillate of petroleum fuel oil, but alternative sources such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel are also being developed.
The process of distillation involves separating the crude oil into different components based on their boiling temperatures. Diesel fuel consists of hydrocarbons with boiling points ranging from 150°C to 380°C. The composition of crude oil can vary, resulting in different types of diesel fuel. High-gravity crude oils, which are thinner and lighter in colour, contain more of the lighter products needed for transportation fuels and have a lower sulfur content. On the other hand, low-gravity crude oils are thicker and darker, resembling melted tar.
The properties of diesel fuel are characterised by several factors, including cetane number, fuel volatility, density, viscosity, low-temperature operability, and sulfur content. These properties can vary depending on the fuel grade and the country's specifications. For example, in Europe, ultra-low sulfur diesel can only contain 10 ppm of sulfur, while road diesel in the USA can contain up to 15 ppm.
The production of diesel fuel can also involve blending different refinery streams, mostly from the primary distillation unit. In some cases, components from other units, such as cracking processes, are used to increase diesel fuel production. One such process is hydrocracking, which converts less useful fractions into the desired saturated hydrocarbons through hydrogenation. Synthetic diesel is another option, produced from carbonaceous precursors like natural gas using the Fischer-Tropsch process.
Diesel fuel plays a crucial role in various industries, especially in heavy trucks and drilling fluids. Its low cost and ability to drill through challenging strata like shale, salt, and gypsum make it a popular choice. However, diesel exhaust, particularly from older engines, can pose health risks. Overall, diesel fuel is a versatile and widely used product, with its characteristics and applications continuing to evolve.
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It is composed of about 75% saturated hydrocarbons and 25% aromatic hydrocarbons
Diesel fuel is a mixture of hydrocarbons obtained by the distillation of crude oil. The most common type of diesel fuel is a specific fractional distillate of petroleum fuel oil. In the United States, petroleum-derived diesel is composed of about 75% saturated hydrocarbons and 25% aromatic hydrocarbons.
Saturated hydrocarbons are compounds in which the four valencies of the carbon atom are satisfied by single bonds. They contain the maximum number of hydrogen atoms for each carbon atom. Alkanes are an example of saturated hydrocarbons. The general formula for an alkane is CnH2n+2, where 'n' is the number of carbon atoms in the molecule. The first four alkanes (methane, ethane, propane, and butane) are gases at room temperature.
Aromatic hydrocarbons, also known as arenes, are characterised by the presence of one or more benzene rings in their molecular structure. While not all aromatic hydrocarbons have distinctive aromas, many do. Benzene, for example, is a ubiquitous aromatic environmental contaminant that is toxic to humans and animals. Aromatic hydrocarbons are highly reactive and have large emission rates. They are an important class of organic compounds found in the atmosphere and contribute significantly to the formation of ozone and other photooxidants in urban atmospheres.
The composition of diesel fuel can vary depending on the source of the crude oil and the distillation process. The quality and quantity of the streams drawn off from distillation depend on the chemical composition of the crude oil. Diesel fuel specifications differ for various fuel grades and in different countries.
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Paraffinic hydrocarbons improve ignition quality but have poor low-temperature properties
Diesel fuel is a mixture of hydrocarbons obtained by the distillation of crude oil. It is specifically designed for use in diesel engines, which are a type of internal combustion engine where fuel ignition occurs without a spark as a result of the compression of inlet air and the injection of fuel. Diesel fuel needs good compression ignition characteristics.
Paraffinic hydrocarbons are the most favourable components for diesel fuel. They improve the ignition quality of diesel fuel, but their low-temperature properties tend to be poor. Paraffins are the most convenient type of hydrocarbon molecule from the point of view of clean and complete combustion in compression ignition engines. They are produced with various processes from fossil or renewable feedstocks. Synthetic fuels are produced by gasification and Fischer-Tropsch (FT) liquefaction from natural gas (Gas-to-Liquid, GTL), and coal (Coal-to-Liquid, CTL).
The viscosity of paraffinic fuels is close to that of conventional diesel fuels at cold temperatures. However, the light and narrow distillation range of paraffinic hydrocarbons is not favourable for the response of the current cold flow additives. By default, viscosity increases as temperature decreases. The lubricity of paraffinic fuels corresponds to that of sulfur-free winter grade diesel fuels, and both require a lubricity additive to protect fuel injection equipment against excess wear.
The oxidation stability "Rancimat" method, designed for FAME, is not valid for hydrocarbon diesel fuels, as this test may not find the exact point when the fuel loses its capability to resist oxidation. Traditional stability methods used for diesel fuel are valid for paraffinic fuels, whereas oxygenated fuels may need special methods.
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Aromatics may lead to carcinogenic compounds in exhaust gases
Diesel fuel is a mixture of hydrocarbons obtained by the distillation of crude oil. It is specifically designed for use in diesel engines, which are a type of internal combustion engine. Diesel fuel needs good compression ignition characteristics, as fuel ignition occurs without a spark due to the compression of inlet air and the injection of fuel.
The mixture consists of hydrocarbons with carbon numbers predominantly ranging from C9 to C20, and boiling points ranging from approximately 150°C to 380°C. In the United States, petroleum-derived diesel is composed of about 75% saturated hydrocarbons, primarily paraffins, and 25% aromatic hydrocarbons. Aromatic hydrocarbons include naphthalenes and alkylbenzenes.
The aromatic content of diesel fuel is a crucial factor in the emissions produced, particularly in the concentration of particulate matter (PM). Particulate matter refers to tiny particles of solid or liquid matter suspended in the air. Studies have shown that higher aromatic content in diesel fuel increases exhaust emissions and their toxicity. Aromatic hydrocarbons have been linked to an increased risk of bladder cancer.
The toxicity of exhaust emissions is influenced by the aromatic content of diesel fuel. Research has demonstrated that decreasing the aromatic content of diesel fuel can effectively reduce the toxicity of exhaust emissions. This reduction in toxicity is attributed to lower levels of genotoxicity, inflammatory responses, and alterations in the cell cycle. Therefore, it is essential to minimize the aromatic content of diesel fuel to mitigate the harmful effects of exhaust gases, including the presence of carcinogenic compounds.
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Synthetic diesel is produced from carbonaceous precursors, with natural gas being most important
Diesel fuel is a mixture of hydrocarbons obtained by distillation of crude oil. The most common type of diesel fuel is a specific fractional distillate of petroleum fuel oil. However, alternatives that are not derived from petroleum, such as biodiesel, biomass-to-liquid (BTL), or gas-to-liquid (GTL) diesel, are becoming increasingly common.
Synthetic diesel is a type of diesel fuel that can be produced from carbonaceous precursors. Natural gas is the most important precursor, but synthetic diesel can also be produced from other carbon-bearing feedstocks such as coal or biomass. The process of converting these feedstocks into fuel involves reacting hydrogen with other molecules, typically carbon dioxide. This synthetic diesel, also known as Fischer-Tropsch diesel, is compatible with existing diesel engines and can be mixed with petroleum diesel. It has excellent properties, such as a very high cetane number and no sulfur content, which can improve the performance and emissions of the blended petroleum fuels.
The production of synthetic diesel from natural gas is often referred to as a gas-to-liquid (GTL) technology. This term does not cover all synthetic fuel technologies, as liquid fuels can be produced from almost any carbonaceous feedstock that is gaseous, liquid, or solid. For example, coal was previously used as a feedstock for manufacturing FT coal-to-liquid (CTL) diesel fuel.
The commercialization of synthetic fuels faces challenges due to environmental concerns. GTL fuels manufactured from natural gas do not inherently reduce greenhouse gas emissions compared to petroleum diesel. Only synthetic fuels created using renewable feedstocks and/or renewable energy have the potential to decrease life cycle CO2 emissions relative to petroleum fuels. Potential locations for the commercialization of GTL plants include regions with abundant low-cost gas resources, such as the Middle East, West Africa, and Alaska's North Slope.
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Frequently asked questions
Diesel fuel, also known as diesel oil, heavy oil, or simply diesel, is a liquid fuel used in diesel engines. It is a fractional distillate of petroleum fuel oil, but can also be derived from non-petroleum sources such as biomass-to-liquid (BTL) or gas-to-liquid (GTL) processes.
Diesel fuel is a mixture of hydrocarbons, primarily consisting of saturated hydrocarbons (paraffins) and aromatic hydrocarbons. These hydrocarbons have carbon numbers predominantly in the range of C9–C20 and boiling points between 150°C and 380°C.
Diesel fuel hydrocarbons have good compression ignition characteristics, making them suitable for use in diesel engines. They also have a higher power and fuel efficiency compared to petrol or gasoline.
Diesel fuel hydrocarbons are produced through the distillation of crude oil, which involves separating the desired fractions through processes such as thermal cracking and catalytic cracking. This results in a mixture of hydrocarbons with the desired properties for use in diesel engines.
