Octane

Octane
Name	Octane
IUPAC name	Octane
Other names	n-Octane
Formula	C8H18
Molar mass	114.23 g·mol−1
Density	0.703 g·cm−3 (liquid, 20 °C)
Melting point	−56.8 °C
Boiling point	125.6 °C
CAS number	111-65-9

Octane

Octane is a straight-chain alkane hydrocarbon with the molecular formula C8H18, widely referenced in discussions of internal combustion engine performance, petroleum refining, and fuel standards such as octane rating. It appears in petrochemical streams alongside other alkanes like heptane, nonane, and decane and is relevant to industrial actors including ExxonMobil, Shell plc, BP plc, and Chevron Corporation. Octane is studied by chemists affiliated with institutions such as the American Chemical Society, Royal Society of Chemistry, Massachusetts Institute of Technology, and University of California, Berkeley.

Chemistry and Isomers

Octane is one of many structural isomers in the homologous series of alkanes; the term refers to the C8H18 family which includes numerous constitutional isomers such as 2,2,4-trimethylpentane (commonly known in fuel testing) and branched species investigated by researchers at Max Planck Society and Lawrence Berkeley National Laboratory. Organic chemists at IUPAC conventions and textbooks like those from Cambridge University Press catalogue isomers including n-octane, iso-octane analogues, and stereochemical variants discussed in works by Elias James Corey and Robert Burns Woodward. Mechanistic studies on octane involve radical chain reactions detailed in monographs by Lavoisier-era historiographies and modern kinetics researchers associated with Princeton University and California Institute of Technology. Catalysis groups at Johnson Matthey and BASF study isomerization pathways using zeolite catalysts characterized by teams at Oak Ridge National Laboratory and Argonne National Laboratory.

Physical Properties

The physical properties of octane—density, vapor pressure, refractive index—are tabulated in compendia from NIST and tested in laboratories at National Physical Laboratory (UK). Thermochemical data such as standard enthalpy and heat capacity are used by process engineers at Siemens and General Electric for simulation of combustion in Rolls-Royce gas turbines and automotive engines developed by Toyota, Ford Motor Company, and Volkswagen AG. Spectroscopic fingerprints (¹H NMR, ¹³C NMR, IR, mass spectrometry) are archived in databases curated by Elsevier and experimental groups at ETH Zurich and University of Cambridge. Octane’s vapor–liquid equilibria inform separation designs published by authors affiliated with MIT Press and practiced at refineries owned by TotalEnergies.

Production and Synthesis

Octane is obtained in petroleum refining via fractional distillation of crude oil streams processed by companies like Saudi Aramco, Rosneft, and PetroChina, and by catalytic cracking, hydrocracking, and reforming units developed with technology from Honeywell UOP and Lummus Technology. Synthetic routes include laboratory-scale methods employing Grignard reagents and catalytic hydrogenation taught at Harvard University and Yale University organic chemistry courses; industrially, Fischer–Tropsch synthesis researched at Sasol can yield long-chain alkanes converted to octane-range products. Process safety and optimization studies are conducted by consultants from McKinsey & Company and Bain & Company for energy sector clients such as ConocoPhillips. Analytical monitoring during production uses instrumentation from Agilent Technologies, Thermo Fisher Scientific, and PerkinElmer.

Uses and Applications

Octane-range hydrocarbons serve as key constituents of gasoline blends specified by regulators like the Environmental Protection Agency and the European Commission; formulation standards reference industry test methods from ASTM International and performance criteria used by automakers Honda, BMW, and Mercedes-Benz. In research, octane is employed as a solvent in studies by teams at Scripps Research and Rockefeller University and in organic synthesis protocols published by Wiley. High-octane components such as 2,2,4-trimethylpentane are promoted in anti-knock studies originating with investigators at National Renewable Energy Laboratory and Argonne National Laboratory. Octane and related alkanes are feedstocks for petrochemical plants operated by Dow Chemical Company and DuPont to produce lubricants, waxes, and petrochemical intermediates used by Procter & Gamble and Unilever.

Environmental and Health Effects

Combustion of octane-containing fuels contributes to emissions regulated by agencies like the United Nations Framework Convention on Climate Change signatories, the California Air Resources Board, and the World Health Organization guidelines; pollutants include carbon dioxide, nitrogen oxides, and volatile organic compounds monitored in studies at Imperial College London and Johns Hopkins University. Occupational exposure limits and toxicology profiles are compiled by OSHA, NIOSH, and toxicologists at Mount Sinai Health System; long-term exposure assessments appear in reports by International Agency for Research on Cancer panels and environmental assessments by Environmental Defense Fund. Fate and transport modeling for hydrocarbons is conducted by research groups at NOAA and US Geological Survey.

Safety and Handling

Safety practices for storage and transport of octane follow international rules from International Maritime Organization and International Air Transport Association and material safety data sheets prepared to standards from OSHA and Globally Harmonized System of Classification and Labelling of Chemicals. Fire safety protocols referencing National Fire Protection Association codes are implemented at chemical plants owned by Dow and ExxonMobil; emergency response training is provided by Red Cross affiliates and industrial safety consultants from DuPont Sustainable Solutions. Personal protective equipment and exposure controls follow guidance developed by NIOSH and occupational health units at Cleveland Clinic.

Category:Alkanes