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isobutylene
Sign in to saveAlso known as Isopropylidenemethylene, 2-Methylpropylene, 1,1-Dimethylethylene, isobutene, 2-methylpropene, 2-methylprop-1-ene
Isobutylene (or 2-methylpropene) is a hydrocarbon with the chemical formula . It is a four-carbon branched alkene (olefin), one of the four isomers of butylene. It is a colorless flammable gas, and is of considerable industrial value.
Chemical data
- Formula
- C4H8
- Molecular weight
- 56.11 g/mol
- IUPAC name
- 2-methylprop-1-ene
- SMILES
- CC(=C)C
- InChIKey
- VQTUBCCKSQIDNK-UHFFFAOYSA-N
- XLogP
- 2.1
- Polar surface area
- 0 Ų
- H-bond donors
- 0
- H-bond acceptors
- 0
- Formal charge
- 0
via PubChem
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Encyclopedic overview
6 sectionsContents
- Production
- Uses
- Safety
- See also
- References
- External links
Isobutylene (or 2-methylpropene) is a hydrocarbon with the chemical formula . It is a four-carbon branched alkene (olefin), one of the four isomers of butylene. It is a colorless flammable gas, and is of considerable industrial value.
==Production== Polymer and chemical grade isobutylene is typically obtained by dehydrating tertiary butyl alcohol (TBA) or catalytic dehydrogenation of isobutane. Gasoline additives methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE), respectively, are produced by reacting methanol or ethanol with isobutylene contained in butene streams from olefin steam crackers or refineries, or with isobutylene from dehydrated TBA. Isobutylene is not isolated from the olefin or refinery butene stream before the reaction, as separating the ethers from the remaining butenes is simpler. Isobutylene can also be produced in high purities by "back-cracking" MTBE or ETBE at high temperatures and then separating the isobutylene by distillation from methanol.
Excerpted from Wikipedia’s “isobutylene” article, available under the CC BY-SA 4.0 licence.