Sylvie Willis
Sulphur is a naturally occurring element commonly found in crude oil-derived fuels. Sulphur content in diesel fuel has been linked to damage to engine components and air quality. To combat this, ultra-low sulphur diesel (ULSD) has been introduced in many regions, with a maximum sulphur content of 10-15 parts per million. The transition to ULSD has been facilitated by organisations such as the US Environmental Protection Agency (EPA) and the European Union, with the goal of reducing harmful emissions and improving air quality. As of 2024, the EPA is considering aligning with the global sulphur standard of 5000 ppm for marine fuels. This paragraph will explore the topic of sulphur content in diesel fuel, specifically focusing on the 20 ppm standard and its implications.
Characteristics and Values of Sulfur in Diesel Fuel
| Characteristics | Values |
|---|---|
| Sulphur content in diesel fuel | 15 ppm or lower |
| Sulphur content in red diesel | 0.1% (1000 ppm) |
| Sulphur content in USLD | 10 milligrams per kilogram |
| Sulphur content in CARB diesel | 500 ppm |
| Sulphur content in LSD | 500 ppm |
| Sulphur content in pre-regulation diesel fuel | 5000 ppm |
| Sulphur content in marine diesel | 0.5% (5000 ppm) outside of ECAs, 3.5% outside ECA boundaries |
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What You'll Learn
Sulfur content in diesel fuel has been reduced to near-zero levels
Sulfur is a naturally occurring element that is tasteless and odourless. It is a key component in many amino acids and proteins that are essential to life on Earth. However, sulfur in diesel is particularly known to cause damage to both engine components and air quality following combustion.
To combat these harmful effects, the diesel industry has been transitioning to ultra-low sulfur diesel (ULSD). ULSD is a type of diesel fuel with substantially lowered sulfur content—a maximum of 15 parts per million (ppm) of sulfur. This is a significant reduction from the previous limit of 500 ppm. The allowable sulfur content for ULSD is much lower than the previous US on-highway standard for low sulfur diesel, which allowed advanced emission control systems that would otherwise be damaged and rendered ineffective by these compounds.
The move towards ULSD began in 1993 when the European Union started mandating the reduction of diesel sulfur content. The US followed suit in 1993 as well, with the California Air Resources Board (CARB) adopting a diesel fuel specification limiting sulfur content to a maximum of 500 ppm. Since 2006, almost all petroleum-based diesel fuel available in Europe and North America has been of the ULSD type. The US began phasing in ULSD requirements for highway vehicles in 2006, with implementation for off-highway applications, such as locomotive and marine fuel, beginning in 2007.
The transition to ULSD has been beneficial for both engine performance and the environment. The use of ULSD in conjunction with emissions control devices can reduce the exhaust output of ozone precursors and particulate matter to near-zero levels. This results in a significant reduction in harmful emissions from diesel combustion, including nitrogen oxide emissions and soot or particulate matter. Additionally, ULSD minimizes the need for detergent additives in engines, addressing the issues of sulfuric acid concentrations in exhaust emissions.
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Ultra-low sulfur diesel (ULSD)
Ultra-low-sulfur diesel (ULSD) is diesel fuel with a substantially lowered sulfur content. Since 2006, almost all petroleum-based diesel fuel available in Europe and North America has been ULSD. The shift towards ULSD was driven by the need to reduce harmful emissions from diesel combustion.
Sulfur is a naturally occurring element commonly found in crude oil-derived fuels. While it is tasteless and odourless, it is known to cause damage to engine components and air quality following combustion. In the past, additives or 'detergents' were used in engines to reduce the detrimental effects of sulfur on engine components. However, these additives did little to address the long-term environmental impact of sulfur.
ULSD contains dramatically lower levels of sulfur, with a maximum of 15 parts per million (ppm) of sulfur content. This reduction in sulfur content allows for the use of advanced emissions control technologies, which, in conjunction with ULSD, can reduce the exhaust output of ozone precursors and particulate matter to near-zero levels. The application of these technologies substantially lowers the harmful emissions from diesel combustion.
The transition to ULSD was facilitated by regulatory bodies such as the US Environmental Protection Agency (EPA) and the European Union. In 1993, the EPA established a requirement that diesel fuel contain less than 500 ppm of sulfur. Over time, the EPA and the European Union gradually lowered the allowable sulfur content in diesel fuel. By 2006, the EPA mandated ULSD for highway diesel fuel engines, with off-road equipment, locomotives, and marine fuel following suit in 2007.
The implementation of ULSD has had a significant impact on reducing emissions. According to EPA estimates, the new fuel standards for diesel are expected to reduce nitrogen oxide emissions by 2.6 million tons annually and soot or particulate matter by 110,000 tons per year. ULSD also increases the compatibility of diesel-fueled vehicles across different regions, as the lower sulfur content aligns with European fuel standards.
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The impact of sulfur on the environment
Sulfur is naturally present in diesel fuel, deriving from the original crude oil source, and can remain after refining. The combustion of sulfur in diesel fuel creates sulfuric acid, which causes corrosive wear on the metal surfaces of an engine. This corrosion can lead to the failure of engine parts. To combat this, engine oils with basic (alkaline) additives were used to react with sulfur acids, preventing them from reaching and corroding the metal surfaces. Alternatively, high levels of detergents were used to neutralise corrosive acids and produce non-corrosive by-products.
However, the presence of sulfur in diesel fuel also has a significant impact on the environment. After combustion, around 95% of the sulfur is emitted as sulfur dioxide (SO2), a toxic gas that is detrimental to human health. SO2 emissions contribute to an increase in asthma, heart disease, and respiratory disease. Furthermore, the release of fine sulfate particles into the air forms a large portion of the particulate matter (PM) that acts as a source of environmental pollution, generating acidic aerosols that result in acid rain, snow, and fog.
Regulations have been implemented to reduce the allowable sulfur content in diesel fuel and mitigate its environmental impact. In the United States, the maximum sulfur level was reduced to 15 ppm (Ultra Low Sulfur Diesel) for on-road diesel engines in 2006, and this standard was later adopted for non-road, locomotive, and marine diesel fuel in 2014. Similar efforts to reduce sulfur emissions have been made in the maritime industry and on a global scale, with new rules reducing the global sulfur limit in marine fuels outside designated Sulfur Emissions Control Areas (SECAs).
The reduction of sulfur content in diesel fuel has had a positive environmental impact. Ultra-Low Sulfur Diesel (ULSD) has significantly reduced emissions and environmental pollution by lowering sulfur content and enabling advanced emission control technologies. For example, the use of gasoline-diesel blends has resulted in a significant reduction in smoke, NOx, and particulate emissions compared to conventional diesel fuel. Additionally, the combustion of these blends has decreased the average particle diameter, contributing to a decrease in the formation of particulate matter.
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Sulfur content in diesel fuel in California
In 1988, California diesel fuel regulations were adopted, setting limits on aromatic hydrocarbon content (10% by volume) and sulfur content (500 parts per million by weight, ppmw). These regulations came into effect in 1993, reducing emissions from diesel engines and equipment, including Oxides of Nitrogen, Particulate Matter, Sulfur Oxides, and toxic substances such as benzene and Polynuclear Aromatic Hydrocarbons.
In 1993, the California Air Resources Board (CARB) further adopted a diesel fuel specification limiting the sulfur content in commercially available diesel fuel to a maximum of 500 ppm. This applied to both on-road and off-road vehicles but excluded stationary engines, locomotives, and marine vessels.
In 2004, the CARB diesel requirement was extended to stationary sources, including on-road and off-road motor vehicles, and non-vehicular sources, excluding locomotives and marine vessels. As of January 2005, CARB diesel was required to meet a minimum lubricity specification to ensure adequate lubrication of diesel engines.
Proposed amendments to the California diesel fuel regulations aimed to reduce the maximum sulfur content from 500 ppmw to 15 ppmw starting in mid-2006. This change would align California's sulfur requirements with the U.S. EPA's on-road and off-road rules and enable the use of advanced emissions control technologies for heavy-duty engines and vehicles. The new low-sulfur requirement was expected to further reduce emissions of SO2 and PM.
The transition to lower sulfur content in diesel fuel is driven by the need to reduce harmful emissions from diesel combustion and enable the use of advanced emissions control technologies. Ultra-low sulfur diesel (ULSD) has been the norm in the United States and Europe since 2006, with a maximum sulfur content of 15 ppm. This significant reduction in sulfur content has positively impacted air quality and engine component durability.
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The lubricity of diesel fuel
Sulphur is naturally present in crude oil-derived fuels, including diesel. While sulphur is odourless and tasteless, it is known to damage engine components and compromise air quality. Due to this, modern diesel fuels contain significantly less sulphur, with ultra-low sulphur diesel (ULSD) becoming the norm in Europe and North America since 2006. ULSD contains a maximum of 15 parts per million of sulphur, compared to 5,000 parts per million in traditional diesel fuel.
The transition to ULSD has resulted in diesel fuel with reduced lubricity. This is because the process of removing sulphur also eliminates some of the natural lubricating compounds within diesel fuel. As a result, engine components are more vulnerable to wear and tear, leading to increased maintenance costs, reduced engine performance, and a shorter engine life. To address this issue, refineries treat ULSD with lubricity improvers to meet the 520-micron EPA standard. However, some engine and fuel injection system manufacturers believe that this standard is not conservative enough, and recommend using fuel with a maximum wear scar of 460 microns or lower.
The reduction in lubricity has also led to the exploration of various additives to enhance lubricity in low-sulphur diesel. Fatty acid methyl esters, derived from biofuels, have been found to significantly improve the lubricating properties of diesel fuel, forming a protective layer on metal surfaces. Standardised testing and the use of tools like the High-Frequency Reciprocating Rig (HFRR) are critical to ensuring that diesel fuels meet minimum lubricity requirements and do not cause excessive wear and tear on engines.
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Frequently asked questions
It depends on the type of diesel fuel and the region. Ultra-low sulfur diesel (ULSD) has a sulfur content of 15 ppm, while low sulfur diesel (LSD) has 500 ppm. In the US, ULSD has been the norm for on-road vehicles since 2006, and for non-road vehicles since 2010. In California, diesel fuel regulations limit sulfur content to 500 ppm. In Europe, diesel fuel with a sulfur content of up to 1000 ppm is used in seagoing marine vessels, stationary engines, and heating boilers.
ULSD is a type of diesel fuel with a significantly lower sulfur content compared to regular diesel. It has a maximum sulfur content of 15 ppm, which is much lower than the previous US on-highway standard for low sulfur diesel (LSD) at 500 ppm.
ULSD allows for the use of advanced emission control technologies, which substantially lower the harmful emissions from diesel combustion. By using ULSD, emissions of nitrogen oxide and particulate matter can be reduced.
Sulfur can combine with the nickel content in metal alloys used in engines, forming a low-melting eutectic alloy that increases lubricity. However, high sulfur content can also lead to the formation of sulfuric acid, causing damage to engine components.
Yes, in some cases, low sulfur diesel (LSD) or regular diesel with higher sulfur content may still be used. Additionally, there are ongoing developments in engine technologies and additives to reduce the negative impacts of sulfur on engines and the environment.
