1,2-Butadiene
1,2-Butadiene is the organic compound with the formula CH2=C=CHCH3. It is an isomer of 1,3-butadiene, a common monomer used to make synthetic rubber. It is a colorless flammable gas, one of the simplest substituted allenes.[1]
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| Names | |
|---|---|
| Other names
Methyl allene; Buta-1,2-diene | |
| Identifiers | |
3D model (JSmol) |
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| 1730808 | |
| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.008.796 |
| EC Number |
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| 1144 | |
PubChem CID |
|
| UNII | |
CompTox Dashboard (EPA) |
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| |
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| Properties | |
| C4H6 | |
| Molar mass | 54.092 g·mol−1 |
| Density | 0.676 at 4 °C |
| Melting point | −136.2 °C (−213.2 °F; 137.0 K) |
| Boiling point | 10.9 °C (51.6 °F; 284.0 K) |
Refractive index (nD) |
1.4205 at 1 °C |
| Thermochemistry | |
Enthalpy of vaporization (ΔfHvap) |
23.426 kJ/mol |
| Hazards | |
| Main hazards | Frostbite, flammable |
| GHS pictograms |    |
| GHS Signal word | Danger |
GHS hazard statements |
H220, H224, H280, H411 |
| P210, P233, P240, P241, P242, P243, P273, P280, P303+361+353, P370+378, P377, P381, P391, P403, P403+235, P410+403, P501 | |
| Flash point | −75 °C (−103 °F; 198 K) |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Production
The C4-fraction obtained by cracking and separated by distillation consists of many compounds, predominantly (75%) 1,3-butadiene, isobutene, 1-butene. 1,2-Butadiene comprises less than 1% or this mixture.[2] It is partially purified by extraction with N-methylpyrrolidone. US product is 5,000 -25,000 tons.[1]
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References
- "Product Safety Summary 1,2-BUTADIENE" (PDF). ExxonMobil. March 2016.
- J. Grub; E. Löser (2012). "Butadiene". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a04_431.pub2.
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