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a liquid alkane hydrocarbon found in petroleum and existing in 18 isomeric forms, esp the isomer n-octane. Formula: C8H18
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



n-octane, a saturated hydrocarbon, C6H18; a colorless liquid with a characteristic odor. Melting point, –56.8°C; boiling point, 125.67°C; density, 0.7025 g/cm3 at 20°C; octane number, 17–19. Along with isooctane and other isomers, octane is found in petroleum and straight-run gasoline (up to 10 percent); large quantities of octane are present in synthetic gasoline prepared from CO and H2.

Octane is extracted commercially by rectification, then refined with urea or by means of molecular sieves. At 500°C and a pressure of 1–2 meganewtons per sq m, or 10–20 kilograms-force per sq cm, octane converts into a mixture of aromatic hydrocarbons (o-xylene and ethylbenzene) when passed over an aluminum-molybdenum or aluminum-chromium catalyst in the presence of hydrogen. This dehydrocyclization reaction is one of the main processes used in catalytic reforming.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Although octane 80 petrol is cheaper, it is also less efficient for car engines, and octane 87 petrol would significantly raise engine efficiency, he added.
Isomerisation offers refiners a higher octane gasoline blend stock that is free from benzene, aromatics, oxygenates and olefins.
Octane was founded and is headed by Amendra Pratap who, after 15 years of career experience, 7+ of which were at Macquarie Bank leading the Business Intelligence department, started Octane to deliver IBM Planning Analytics software specializing in Business Intelligence tools.
Octane rating or octane number is a standard measure of the performance of an engine or aviation fuel.
Petroleum Division Director General Jibar Memon confirmed that no other automaker had complained about the use of chemicals to boost the octane quality of petrol.
Smith said: 'The Octane risk team is quickly starting to form into the most impressive I've worked with.
Until now, India has hadan octane rate of 97, offered by BPCL, and Shell's octane rating is a tad less."
An increasing number of vehicles are being sold with engines that require premium gasoline to run without damage, or where it is strongly recommended to achieve efficiency operation ("Selecting the right octane fuel", US
Following a decision approved by the cabinet on August 1 upon a recommendation from an economic committee, starting September 1 consumers will pay 85 fils per liter for Octane 91, up from 60 fils, 105 fils for Octane 95 instead of 65 fils and 165 fils for Ultra-Premium, up from 90 fils.
Manama, July 31 (BNA): The Gasoline Price Review Committee today held its first meeting and decided to set 98 Octane Super fuel prices at 235 Fils per liter starting August 1.