Meaning
Distillate fuels refined to contain minimal sulfur concentrations provide the standard energy source for modern compression ignition engines in transport and industry. Most developed markets require ultra-low sulfur diesel to reduce the environmental impact of heavy duty vehicles and passenger cars. This grade is produced through a process of hydrodesulfurization at the refinery.
Refining Grade
Removal of nearly all sulfur compounds from the fuel allows for the use of advanced exhaust after-treatment systems. Production of ultra-low sulfur diesel involves higher temperatures and pressures than the manufacturing of older, high sulfur fuels. This complexity increases the refining cost but is necessary to meet current air quality standards in major cities.
Environmental Impact
Lowering the sulfur content in the fuel significantly reduces the emissions of sulfur dioxide and fine particulate matter. Use of ultra-low sulfur diesel contributes to the prevention of acid rain and improves public health in areas with high traffic density. This transition has been a central part of global efforts to clean up the transportation sector over the past two decades.
Market Standard
Prices for this fuel serve as the primary reference for the middle distillate market in Europe and North America. Ultra-low sulfur diesel is traded in large volumes on both the spot and futures markets, providing liquidity for producers and distributors. Contracts for the material specify a maximum sulfur level, typically ten or fifteen parts per million depending on the jurisdiction.
Blending with bio-based components is common to meet renewable energy targets in various countries. These blends must still meet the strict technical specifications of the base fuel to ensure compatibility with existing engine technology.