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| Names | |
|---|---|
| Preferred IUPAC name Buta-1,2-diene | |
| Other names Methyl allene | |
| Identifiers | |
| CAS Number | |
| 3D model (JSmol) | |
| Beilstein Reference | 1730808 |
| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.008.796 
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| EC Number |
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| Gmelin Reference | 1144 |
| PubChem CID | |
| UNII | |
| CompTox Dashboard (EPA) | |
InChI
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SMILES
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| Properties | |
| Chemical formula | C4H6 |
| Molar mass | 54.092 g·mol |
| 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 | |
| Occupational safety and health (OHS/OSH): | |
| Main hazards | Frostbite, flammable |
| GHS labelling: | |
| Pictograms |  
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| Signal word | Danger |
| Hazard statements | H220, H224, H411 |
| Precautionary statements | P210, P233, P240, P241, P242, P243, P273, P280, P303+P361+P353, P370+P378, P377, P381, P391, P403, P403+P235, P410+P403, 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 , 100 kPa). Infobox references | |
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.
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. It is partially purified by extraction with N-methylpyrrolidone. US product is 5,000 - 25,000 tons.
References
- ^ "Product Safety Summary 1,2-BUTADIENE". 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. ISBN 978-3527306732.