Sylvie Willis
Aromatics are a base component of gasoline derived from crude oil. They are used to increase the octane rating, which is a measure of how well the fuel works. Aromatics in diesel fuel have been linked to an increase in engine deposits and a decrease in engine cleanliness. They are also associated with the presence of carcinogenic compounds in exhaust gases, such as benzene and polyaromatic compounds. Aromatics represent roughly 25% of the average gallon of unleaded gasoline. In Sweden, a diesel fuel called MK-1 is sold, which has a limit of 5% aromatics content.
| Characteristics | Values |
|---|---|
| Aromatics in diesel fuel | Aromatics are a base component of gasoline derived from crude oil. |
| Aromatics content in diesel | In the US, petroleum-derived diesel is composed of about 25% aromatic hydrocarbons. |
| Aromatics and engine cleanliness | Aromatics may worsen engine cleanliness and increase engine deposits. |
| Aromatics and emissions | Aromatics have been linked to increased carbon monoxide and particulate emissions from light-duty vehicles. |
| Aromatics and health | Aromatics have been linked to health issues, including diseases ranging from ADHD to asthma. |
| Ultra-low-sulfur diesel (ULSD) | ULSD has lower aromatics content, with a limit of 5%. |
| Environmental impact | Aromatics may lead to carcinogenic compounds in exhaust gases. |
| Alternatives to aromatics | The Urban Air Initiative advocates for more ethanol in fuels to boost octane ratings instead of aromatics. |
Explore related products
What You'll Learn
Aromatics in diesel fuel are linked to health issues
Aromatics are a base component of gasoline derived from crude oil. They are used to increase the octane rating, which is a measure of how well the fuel works. Aromatics in gasoline have high octane numbers. However, aromatics may worsen engine cleanliness and increase engine deposits, which is an important factor for new, sophisticated engines. Aromatics can also lead to carcinogenic compounds in exhaust gases, such as benzene and polyaromatic compounds.
In the United States, petroleum-derived diesel is composed of about 75% saturated hydrocarbons and 25% aromatic hydrocarbons. Aromatics in diesel fuel are linked to health issues. For example, diesel exhaust, especially from older engines, can cause health damage. The environmental and health communities are concerned that aromatics exist in the environment at unsafe levels. The chemicals get released into the air as nano-sized particles, which can be absorbed through the lungs or skin. Studies have linked these particles from aromatics to diseases ranging from ADHD to asthma.
A growing body of health literature supports a correlation between aromatic use and health problems. However, skeptics say more research is needed to build a consensus. Environmental groups have called for the use of updated technology in diesel engines to stop particulates from getting into the air. This technology is already mandated for diesel engines by the EPA, but implementing it for light-duty vehicles is more challenging and expensive.
If a scientific consensus is reached on the dangers of aromatics, the EPA could move to scale back or eliminate them, as they did with lead. Ultra-low-sulfur diesel (ULSD) is already being sold in some places, such as Sweden, and it has a lower aromatics content, with a limit of 5%. This fuel is slightly more expensive to produce than regular ULSD.
Gas vs Diesel Fuel Filters: What's the Difference?
You may want to see also
Explore related products
Aromatics in exhaust gases can be carcinogenic
Aromatics are a base component of gasoline derived from crude oil. They are manipulated by refiners to increase the octane rating, which measures how well the fuel works. Aromatics in gasoline have high octane numbers. However, aromatics may worsen engine cleanliness and increase engine deposits, which is a crucial factor for new, sophisticated engines and after-treatment devices. Aromatics in diesel fuel can lead to carcinogenic compounds in exhaust gases, such as benzene and polyaromatic compounds.
The environmental and health risks associated with aromatics in diesel fuel are significant. The release of nano-sized particles, or ultrafine particulate matter (UFPs), from aromatics can be absorbed through the lungs or skin, causing various diseases. Studies have linked these particles to health issues such as ADHD, asthma, and other problems supported by a growing body of health literature. Environmentalists and health advocates consider aromatics to be equally harmful to lead, which was previously used for this purpose until its ban in 1995 due to its toxicity and detrimental effects on human health.
Legislative and fuel standard controls aim to address these concerns. For instance, the Fuel Quality Directive 2009/30/EC in Europe defines the requirements for basic fuel properties for diesel fuel, and the European standard EN 590 includes more extensive provisions to ensure the proper functionality of diesel fuel in the market. Additionally, ultra-low-sulfur diesel (ULSD) is a type of diesel fuel with significantly reduced sulfur content, which has become the norm in the United Kingdom, mainland Europe, and North America.
Despite these efforts, the use of aromatics in gasoline has not decreased significantly. Aromatics comprise approximately 25% of the average gallon of unleaded gasoline, according to a Morning Consult review. This persistence of aromatics in fuel contributes to the presence of carcinogenic compounds in exhaust gases, posing health risks to individuals exposed to these emissions.
To mitigate the issue, alternatives to petroleum-derived diesel are being developed and adopted, such as biodiesel, biomass-to-liquid (BTL), and gas-to-liquid (GTL) diesel. These alternatives offer the potential for lower aromatics content and, consequently, reduced health and environmental risks associated with exhaust gases.
Storing Diesel: How Long Does It Last?
You may want to see also
Explore related products
Aromatics are a base component of gasoline
Aromatics are indeed a base component of gasoline. They are derived from crude oil and are manipulated by refiners to increase the octane rating, which is a measure of how efficiently the fuel works. Aromatics in gasoline have high octane numbers. However, aromatics can worsen engine cleanliness and increase engine deposits, which is a significant factor for newer, more sophisticated engines. Aromatics may also contribute to carcinogenic compounds in exhaust gases, such as benzene and polyaromatic compounds.
Aromatics are also present in diesel fuel, with petroleum-derived diesel in the United States composed of about 25% aromatic hydrocarbons. The presence of aromatics in diesel fuel has been a subject of research, with studies investigating their influence on diesel engine exhaust emissions. Aromatics in diesel fuel can impact carbon monoxide and particulate emissions, which has led to the development of ultra-low-sulfur diesel (ULSD) with reduced aromatic content.
The use of aromatics in fuels has drawn criticism from environmental and health advocates, who argue that they are no better than lead, which was previously used for this purpose. There are concerns about the unsafe levels of aromatics in the environment, as they are released into the air as ultrafine particulate matter (UFPs) that can be absorbed through the lungs or skin. Studies have linked these particles to various health issues, including ADHD and asthma.
To address these concerns, alternatives such as ethanol have been proposed to reduce aromatics levels and improve fuel emissions. However, increasing ethanol use faces political challenges, and regulatory control over aromatics has been limited. As a result, aromatics continue to be a significant component of gasoline and diesel fuel, with ongoing debates and research into their environmental and health impacts.
Spotting Contaminated Diesel Fuel: What to Look For
You may want to see also
Explore related products
Aromatics can worsen engine cleanliness
Aromatics are a base component of gasoline derived from crude oil. They are manipulated by refiners to increase the octane rating, which measures how well the fuel works. Aromatics in gasoline have high octane numbers. However, aromatics may worsen engine cleanliness and increase engine deposits, which is a crucial factor for sophisticated engines and after-treatment devices. Aromatics can lead to carcinogenic compounds in exhaust gases, such as benzene and polyaromatic compounds.
The impact of aromatics on engine cleanliness and performance is a well-studied topic. Research programmes have been designed to investigate the relationship between diesel fuel aromatic content and engine exhaust emissions. These studies have found a significant influence of fuel properties on carbon monoxide and particulate emissions from light-duty vehicles. The environmental impact of aromatics is also a concern, as they can contribute to ultrafine particulate matter (UFPs) in the air, which has been linked to various health issues.
The use of aromatics in diesel fuel can have negative consequences for engine cleanliness and performance. Aromatics can increase deposits and residue in engines, particularly in sophisticated engines with advanced after-treatment devices. This build-up of deposits can lead to reduced engine efficiency and, in some cases, even engine damage. The presence of aromatics in diesel fuel can also contribute to the formation of harmful compounds, such as benzene and polyaromatic hydrocarbons, which can be released into the atmosphere through exhaust gases.
To address the issues associated with aromatics, several solutions have been proposed. One suggestion is to increase the use of ethanol in fuels, which can boost octane ratings while reducing aromatics levels. This approach has gained support from organisations like the Renewable Fuels Association, which claims that ethanol can reduce tailpipe emissions by up to 50%. However, implementing such changes can be challenging due to political and legislative hurdles.
Another approach to mitigate the negative impact of aromatics is through engine technology advancements. Modern diesel engines are designed to meet stringent fuel quality requirements and are equipped with emission control devices. These engines are engineered to minimise the release of harmful particulates into the air, reducing the environmental and health impact of aromatics. Additionally, fuel standards and legislation play a crucial role in regulating the use of aromatics. For example, the European Fuel Quality Directive sets requirements for basic fuel properties, including aromatics content, to ensure the proper functionality and environmental performance of diesel fuel.
The Lifespan of Diesel Fuel: How Long Does it Last?
You may want to see also
Explore related products
Ultra-low-sulfur diesel has lower aromatics content
Aromatics are a component of diesel fuel that can worsen engine cleanliness and increase engine deposits. They may also lead to carcinogenic compounds in exhaust gases, such as benzene and polyaromatic compounds. Aromatics in gasoline have high octane numbers.
Ultra-low-sulfur diesel (ULSD) is diesel fuel with a substantially lowered sulfur content. Specifically, it is defined by the U.S. Environmental Protection Agency (EPA) as diesel fuel with a maximum sulfur content of 15 parts per million (ppm). The EPA has the authority to regulate diesel fuel and mandated a reduction in sulfur content from 500 ppm to 15 ppm, a 97% reduction compared to low sulfur diesel. This reduction in sulfur content allows for the application of advanced emissions control technologies, which substantially lower the harmful emissions from diesel combustion.
The refining process that removes the sulfur from ULSD also reduces the aromatic content and density of the fuel, resulting in a minor decrease in energy content of about 1%. This decrease in energy content may result in slightly reduced peak power and fuel economy. ULSD has poor cold flow characteristics due to the reduction in aromatic content, which increases the propensity of the fuel to gel or wax. Lower aromatic content can also cause premature failure of some rubber components like gaskets and seals.
Since 2006, almost all of the petroleum-based diesel fuel available in Europe and North America has been of the ULSD type. The move towards lower sulfur content began in the European Union in 1993, with modern ULSD specifications implemented in 1999. The United States started phasing in ULSD requirements for highway vehicles in 2006, with implementation for off-highway applications, such as locomotive and marine fuel, beginning in 2007.
In Sweden, a diesel fuel with very low aromatic content (less than 1% by volume) has been available on the market under the name EcoPar since 2003. It is used in highly polluted working environments, such as in harbors, inside storage houses, during the construction of tunnels, and in vehicles predominantly run in city centers.
Diesel Fuel: A Powerful Vinyl Decal Remover?
You may want to see also
Frequently asked questions
Aromatics are a base component of diesel fuel derived from crude oil. They are manipulated by refiners to increase the octane rating, which is a measure of how well the fuel works.
Aromatics were introduced to make up for the drop in octane ratings after lead was banned from gasoline in 1995 due to its toxic and harmful effects on human health.
Aromatics have been linked to a range of diseases, from ADHD to asthma. They can also worsen engine cleanliness and increase engine deposits, which is an important factor for new sophisticated engines. Additionally, aromatics may lead to carcinogenic compounds in exhaust gases.
In the United States, petroleum-derived diesel fuel is composed of about 25% aromatic hydrocarbons.
There are currently no regulatory controls over the use of aromatics, although the EPA has stated that it is setting more stringent standards to eliminate fuel vapor-related evaporative emissions and improve durability.
