Samiksha Jaiswal (Editor)

2,2,4 Trimethylpentane

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Formula  C8H18
Density  690 kg/m³
Boiling point  99 °C
Appearance  Colorless liquid
2,2,4-Trimethylpentane 224Trimethylpentane Homework Help Science Forums
Related alkanes  2,2-Dimethylbutane 2,3-Dimethylbutane Triptane Tetramethylbutane Tetraethylmethane 2,3,3-Trimethylpentane 2,3,4-Trimethylpentane Tetra-tert-butylmethane 2,3-Dimethylhexane 2,5-Dimethylhexane

2 2 4 trimethylpentane


2,2,4-Trimethylpentane, also known as isooctane or iso-octane, is an organic compound with the formula (CH3)3CCH2CH(CH3)2. It is one of several isomers of octane (C8H18). This particular isomer is the standard 100 point on the octane rating scale (the zero point is n-heptane). It is an important component of gasoline, frequently used in relatively large proportions to increase the knock resistance of the fuel.

Contents

2,2,4-Trimethylpentane 224TRIMETHYLPENTANE CAS 540841 02300218 MP Biomedicals

Strictly speaking, if the standard meaning of ‘iso’ is followed, the name isooctane should be reserved for the isomer 2-methylheptane. However, 2,2,4-trimethylpentane is by far the most important isomer of octane and so, historically, it has ended up with this name.

2,2,4-Trimethylpentane httpsuploadwikimediaorgwikipediacommonsthu

Production

2,2,4-Trimethylpentane 224Trimethylpentane Wikipedia

Isooctane is produced on a massive scale in the petroleum industry by distillation of petroleum. It can also be produced from isobutylene by dimerization (a variant of alkylation) using an Amberlyst catalyst to produce a mixture of iso-octenes. Hydrogenation of this mixture produces 2,2,4-trimethylpentane.

History

2,2,4-Trimethylpentane 224Trimethylpentane CAS 540841 SCBT

Engine knocking is an unwanted process that can occur during combustion in internal combustion engines. Graham Edgar in 1926 added different amounts of n-heptane and 2,2,4-trimethylpentane to gasoline, and discovered that the knocking stopped when 2,2,4-trimethylpentane was added. This was the origin of the octane rating scale. Test motors using 2,2,4-trimethylpentane gave a certain performance which was standardized as 100 octane. The same test motors, run in the same fashion, using heptane, gave a performance which was standardized as 0 octane. All other compounds and blends of compounds then were graded against these two standards and assigned octane numbers.

Safety

2,2,4-Trimethylpentane 224Trimethylpentane C8H18 ChemSpider

In common with all hydrocarbons, 2,2,4-trimethylpentane is exceedingly flammable in the presence of oxygen, and its vapours readily form explosive mixtures with air.

2,2,4-Trimethylpentane 224Trimethylpentane anhydrous 998 CH32CHCH2CCH33

Also in common with all hydrocarbons, inhalation or ingestion of large quantities of 2,2,4-trimethylpentane is harmful. In rare cases a stronger reaction can occur.

2,2,4-Trimethylpentane 224trimethylpentane Critically Evaluated Thermophysical

References

2,2,4-Trimethylpentane Wikipedia


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