Gasoline

Gasoline
Name	Gasoline
Type	Liquid hydrocarbon mixture
Density	~0.71–0.77 g/cm³
Boiling range	~30–200 °C
Composition	Alkanes, cycloalkanes, aromatics
Main uses	Internal combustion engines, solvents, petrochemicals

Gasoline is a volatile, flammable liquid hydrocarbon mixture used primarily as a fuel in internal combustion engines. It is produced by refining crude oil and by processing petroleum-derived streams in petrochemical complexes connected to refineries and chemical plants. Major multinational corporations and national oil companies play central roles in its global supply chains, resembling networks seen in Royal Dutch Shell, ExxonMobil, BP (British Petroleum), Saudi Aramco, and Chevron Corporation operations.

Composition and Properties

Gasoline comprises a complex blend of paraffins, isoparaffins, olefins, naphthenes, and aromatics derived from crude oil fractions and catalytic processes; typical components include hydrocarbons such as octane isomers, cyclohexane, and benzene. Its physical properties—density, octane rating, vapor pressure (Reid vapor pressure), flash point, and distillation curve—are critical for engine compatibility and safety; these parameters are regulated by standards issued by bodies like American Petroleum Institute, ASTM International, and national agencies including U.S. Environmental Protection Agency and European Commission. Chemical composition affects combustion characteristics, emissions, and compatibility with materials used by manufacturers such as Ford Motor Company, Toyota Motor Corporation, and Volkswagen Group.

Production and Refining

Gasoline production begins with crude oil distillation in atmospheric and vacuum towers at refineries such as those formerly owned by Standard Oil successors; heavy fractions are processed in units like catalytic crackers, hydrocrackers, reformers, and alkylation units. Catalytic reforming increases aromatic and isomer content, while fluid catalytic cracking and catalytic hydrocracking convert heavy gas oils into lighter gasoline-range streams; major technology licensors include UOP LLC, Shell Global Solutions, and BASF. Secondary processes—hydrotreating, isomerization, MTBE/ETBE synthesis (historically linked to Methyl tert-butyl ether (MTBE) controversy), and oxygenate blending—influence octane and emissions performance. Global refinery capacities and feedstock flows are influenced by trade hubs such as Rotterdam, Singapore, and Houston, Texas.

Additives and Grades

Refiners and marketers use additives to tailor properties: antiknock agents (historic examples include tetraethyl lead, phased out under initiatives led by U.S. Clean Air Act amendments), oxygenates (ethanol, previously MTBE), deposit control additives, corrosion inhibitors, and dyes for tax classification. Octane ratings are expressed as Research Octane Number (RON), Motor Octane Number (MON), or Anti-Knock Index (AKI) and determine grades marketed by companies like Shell plc, TotalEnergies, and PetroChina. Consumers encounter grade labels (regular, midgrade, premium) reflecting blends suitable for engines designed by manufacturers such as Honda Motor Co., BMW, and Mercedes-Benz.

Distribution and Storage

Distribution networks move gasoline from refineries and import terminals through pipelines, barges, railcars, and tanker trucks to terminals and retail stations operated by chains like 7-Eleven, Walmart, BP, and independent dealers. Storage occurs in aboveground and underground tanks at terminals and service stations; standards and regulations for tanks, spill prevention, and leak detection are enforced by agencies such as U.S. Environmental Protection Agency and national regulators. Critical infrastructure resilience and strategic petroleum reserves maintained by entities such as the United States Strategic Petroleum Reserve and national oil companies affect regional supply and price stability.

Environmental and Health Impacts

Combustion and handling of gasoline produce emissions—carbon dioxide, carbon monoxide, nitrogen oxides, volatile organic compounds (VOCs), particulate matter, and benzene—that contribute to climate change, smog, and health risks; mitigation measures are driven by policy frameworks like the Kyoto Protocol and Paris Agreement and implemented via standards from U.S. Environmental Protection Agency and European Commission. Leaks and spills contaminate groundwater and soils, invoking remediation practices exemplified in cases managed by entities such as Environmental Protection Agency Superfund programs and environmental agencies worldwide. Occupational exposures and urban air pollution pose risks noted by organizations like the World Health Organization and International Agency for Research on Cancer.

Uses and Engine Performance

Primary use is as a spark-ignition engine fuel in automobiles, motorcycles, light trucks, marine outboards, and small engines produced by manufacturers such as Yamaha Corporation, Briggs & Stratton, and Mercury Marine. Gasoline’s volatility, energy density, octane rating, and additives influence engine knock, power output, fuel economy, cold-start behavior, and emissions control systems designed by automakers and suppliers including Bosch (company) and Denso Corporation. Alternative fuels and propulsion—battery electric vehicles from Tesla, Inc., hydrogen fuel cell vehicles developed by Toyota Motor Corporation and Hyundai Motor Company—affect gasoline demand and drive research into biofuels produced by firms like POET, LLC and aviation/transport policy by agencies such as International Civil Aviation Organization.

Historical Development and Economics

Commercial gasoline supply expanded with the rise of internal combustion transportation, shaped by inventors and industrialists associated with Karl Benz, Gottlieb Daimler, and entrepreneurs linked to the rise of oil empires like John D. Rockefeller. Market dynamics—price volatility, taxation, refining margins, crude benchmarks like Brent Crude and West Texas Intermediate, and geopolitical events involving countries such as Iraq, Iran, Russia, and Venezuela—have driven investment cycles and policy responses. Economic transitions, including subsidy reforms and electrification trends in jurisdictions such as California and nations in the European Union, influence long-term demand projections and infrastructure investment by multinational corporations and national governments.

Category:Fuels