Chembox new
ImageFileL1 = Propylene skeletal.svg
ImageSizeL1 = 100px
ImageNameL1 = Skeletal formula of propene
ImageFileR1 = Propylene.png ImageSizeR1 = 120px
ImageNameR1 = Propylene
IUPACName = Propene
Section1 = Chembox Identifiers
CASNo = 115-07-1
UNNumber = 1077 "In Liquefied petroleum gas: "1075
RTECS = UC6740000

Section2 = Chembox Properties
Formula = C3H6
MolarMass = 42.08 g/mol
Appearance = colorless gas
Solubility = 0.61 g/m3 (? °C)
MeltingPt = − 185.2 °C (88.0 K)
BoilingPt = − 47.6 °C (225.5 K)
Viscosity = 8.34 µPa·s at 16.7 °C

Section3 = Chembox Structure
Dipole = 0.366 D (gas)

Section7 = Chembox Hazards
ExternalMSDS = External MSDS
MainHazards = Highly flammable,
NFPA-H = 1
NFPA-F = 4
NFPA-R = 1
FlashPt = −108 °C
RPhrases = 12
SPhrases = 9-16-33

Section8 = Chembox Related
Function = alkenes
OtherFunctn = Ethylene
Isomers of Butylene
OtherCpds = Propane, Propyne
Allene, 1-Propanol
Function = groups
OtherFunctn = Allyl, Propenyl

Propene, also known as propylene, is an unsaturated organic compound having the chemical formula C3H6. It has one double bond, and is the second simplest member of the alkene class of hydrocarbons, and it is also second in natural abundance.


At room temperature, propene is a colourless, odourless gas, though when used as a fuel, it is mixed with minute quantities of foul-smelling sulfurous compounds (mercaptans) so that gas leaks can be readily detected.

Propene has a higher density and boiling point than ethylene due its greater size. It has a slightly lower boiling point than propane and is thus more volatile. It lacks strongly polar bonds, yet the molecule has a small dipole moment due to its reduced symmetry (its point group is Cs).

Propene has the same formula as cyclopropane but a different connectivity of atoms, making these molecules structural isomers.


All propene is obtained from non-renewable sources; petroleum or natural gas deposits (and coal to a lesser extent). It is a fossil fuel. Propene is extracted from these by fractional distillation during oil refining, but demand exceeds supply so most is manufactured by cracking. The products from this process contain a mixture of products and the propene is separated from the other products by fractional distillation.

Production and Uses

Propene is the raw material for the production of polypropylene, a versatile polymer widely used in several different grades for packaging. Most propene is polymerized using Ziegler-Natta catalysis, which produces isotactic polypropylene. Along with benzene, propene is a key feedstock in the cumene process, a reaction carried out on industrial scales to produce acetone and phenol. Propene is also used during the production of many other chemical products such as isopropanol (propan-2-ol), acrylonitrile, and propylene oxide (epoxypropane). [Citation | contribution = 8034. Propylene | year = 1996 | title = The Merck Index, Twelfth Edition | editor-last = Budavari | editor-first = Susan | volume = | pages = 1348-1349 | place = New Jersey | publisher = Merck & Co. | id = ]

The production of propene has remained static at around 35 million tonnes (Europe and North America only) from 2000 – 2008 but has been increasing in East Asia, most notably Singapore and China. [www. Accessed August 2008] [Organic Chemistry 6th edition, McMurry,J., Brooks/Cole Publishing, Pacific Grove USA (2005)] Total world production of propene is currently about half that of ethylene.


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