Diesel

Diesel
Name	Diesel
Caption	Liquid hydrocarbon fuel
Type	Distillate fuel oil
Density	~0.820–0.950 g/cm³
Boiling point	~180–360 °C
Cetane number	~35–55
Main components	Alkane, cycloalkane, aromatic hydrocarbons
Developed	19th century
Inventor	Rudolf Diesel

Diesel Diesel is a class of middle-distillate hydrocarbon fuels used primarily in compression-ignition internal combustion engines, industrial burners, and heating systems. Widely employed in Maritime transport, Rail transport, Heavy machinery, and some Automotive industry sectors, diesel fuel underpins global Energy industry logistics and Trade flows. Its production, specification, and use intersect with standards set by agencies such as the International Organization for Standardization, regulators like the United States Environmental Protection Agency, and industry consortia including the American Petroleum Institute.

Etymology and history

The name traces to the inventor Rudolf Diesel and the late 19th-century development of the compression-ignition engine demonstrated at the World's Columbian Exposition era and related engineering exhibitions. Early commercial adoption accelerated with expansion of Railway networks, the Suez Canal–era shipping boom, and industrialization across Europe and North America. Military and commercial use intensified through both World War I and World War II due to diesel engine efficiency for Naval warfare ships and armored vehicles linked to strategic supply chains. Postwar periods saw integration into United Nations–led reconstruction projects and global Trade liberalization that expanded petroleum refining capacity.

Composition and properties

Diesel is a complex mixture of hydrocarbons predominantly in the C10–C22 range, including linear and branched alkanes, cycloalkanes, and monocyclic and polycyclic aromatics. Typical physical properties are influenced by molecular weight distribution, sulfur content, and aromatic fraction; key metrics include density, viscosity, flash point, and cetane number set by standards like ISO 5165 and regional regulations. Sulfur compounds historically varied; desulfurization programs overseen by the European Union and the United States Environmental Protection Agency reduced sulfur to ultra-low levels to meet emissions targets. Cold-flow properties such as cloud point and pour point determine usability in high-latitude regions governed by standards enforced by agencies like Transport Canada and national ministries.

Production and refining

Refineries produce diesel by atmospheric and vacuum distillation of crude oil, followed by conversion processes including hydrocracking, catalytic cracking, and hydrotreating. Integration with units such as Fluid catalytic cracking units and Hydrotreaters improves cetane and removes sulfur to meet directives like EU Fuel Quality Directive. Alternative routes include Fischer–Tropsch synthesis developed in Germany and expanded in projects in South Africa and China, and hydrotreated vegetable oil (HVO) plants supported by agricultural feedstock supply chains in Brazil and Indonesia. Logistics involve pipelines, tank terminals, and the International Maritime Organization–regulated bunkering network for marine distillates.

Diesel engines and combustion

Diesel fuel is designed for compression-ignition engines pioneered by Rudolf Diesel; modern implementations range from two-stroke marine engines specified by organizations such as IMO to four-stroke automotive and generator engines by manufacturers like Cummins, MAN SE, and Wärtsilä. Combustion is characterized by fuel injection, atomization, mixing, and autoignition under high compression ratios; control technologies include common-rail injection developed by companies like Bosch and electronic management by Siemens. Emissions control employs exhaust aftertreatment systems such as Diesel particulate filters, selective catalytic reduction (SCR) using urea-based reagents popularized in Japan and Germany, and oxidation catalysts to meet standards established by agencies like European Environment Agency and the United States Environmental Protection Agency.

Types of diesel fuels and additives

Commercial grades include automotive diesel (EN 590), marine gas oil regulated under IMO conventions, and industrial distillates specified in national codes. Biodiesel (FAME) blends conform to standards such as EN 14214 and are produced in facilities in regions including European Union member states and United States biodiesel plants. Additives from suppliers like Lubrizol and Infineum modify cetane, lubricity, cold-flow, and corrosion properties; cetane improvers, cold-flow improvers, detergents, and anti-foaming agents are common. Alternative synthetic diesel fuels include Fischer–Tropsch diesel and hydrogenation-derived renewable diesel developed by companies such as Shell and Neste.

Environmental and health impacts

Diesel combustion emits carbon dioxide, nitrogen oxides, particulate matter, and trace polycyclic aromatic hydrocarbons; public health studies by institutions like the World Health Organization and National Institutes of Health link exposure to respiratory and cardiovascular outcomes. Regulatory responses include EU Emissions Trading System considerations, ambient air quality directives from the European Commission, and national emission standards enforced by the United States Environmental Protection Agency. Transition strategies involve electrification promoted by the International Energy Agency, fuel switching supported by Green Climate Fund financing in developing countries, and deployment of low-carbon fuels under policies by governments including Germany and France.

Applications and economics

Diesel powers sectors with high power-density needs: long-haul trucking regulated under agencies like the Federal Motor Carrier Safety Administration, maritime shipping overseen by the International Maritime Organization, rail locomotion by companies such as Union Pacific Corporation and Deutsche Bahn, and stationary power generation for utilities and data centers. Pricing is influenced by crude benchmarks like Brent crude and West Texas Intermediate, taxation policy in jurisdictions such as United Kingdom and Brazil, and refinery margins tracked by market reporters including Platts and Argus Media. Energy security debates involving strategic petroleum reserves held by countries like the United States and China often center on diesel availability for critical infrastructure and disaster response.

Category:Fuels