1,2-butadiene
Structural formula | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
||||||||||||||||
General | ||||||||||||||||
Surname | 1,2-butadiene | |||||||||||||||
other names |
|
|||||||||||||||
Molecular formula | C 4 H 6 | |||||||||||||||
Brief description |
colorless, sweet-smelling gas |
|||||||||||||||
External identifiers / databases | ||||||||||||||||
|
||||||||||||||||
properties | ||||||||||||||||
Molar mass | 54.09 g mol −1 | |||||||||||||||
Physical state |
gaseous |
|||||||||||||||
density |
0.652 kg m −3 (15 ° C) |
|||||||||||||||
Melting point |
−136.2 ° C |
|||||||||||||||
boiling point |
10.9 ° C |
|||||||||||||||
Vapor pressure |
0.14 M Pa (20 ° C) |
|||||||||||||||
solubility |
very bad in water (0.1 g l −1 at 20 ° C) |
|||||||||||||||
Refractive index |
1.4205 (liquid, 1 ° C) |
|||||||||||||||
safety instructions | ||||||||||||||||
|
||||||||||||||||
Thermodynamic properties | ||||||||||||||||
ΔH f 0 |
162.3 kJ / mol |
|||||||||||||||
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C |
1,2-Butadiene [ -butaˈdi̯eːn ] is an organic , doubly unsaturated chemical compound from the group of alkenes . It is an isomer of 1,3-butadiene .
Extraction and presentation
1,2-Butadiene can be obtained by vapor phase isomerization of 2-butyne over base-modified catalysts.
properties
1,2-Butadiene is an extremely flammable gas which forms explosive mixtures with air. It's heavier than air. It dissolves only poorly in water (approx. 1 g / l), but it is soluble in hydrocarbons, alcohols and ethers. Its critical temperature is 176.1 ° C, the critical pressure 43 bar, the critical density 0.247 kg / l and the triple point temperature at −136 ° C (melting temperature). It has a specific heat capacity of 1.471 kJ / (kg K) (in the gaseous state at 25 ° C) or 2.247 kJ / (kg K) (as a liquid at the boiling point. It is easily condensable under pressure.
use
1,2-Butadiene is used as an intermediate in organic synthesis.
Web links
Individual evidence
- ↑ a b c d e f g h i entry to 1,2-butadiene in the GESTIS database of IFA , retrieved on February 1, 2016(JavaScript required) .
- ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-72.
- ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-25.
- ↑ LE Calihan, EL Kay, DT Roberts, LB Wakefield: Synthesis of 1,2-butadiene. Vapor phase isomerization of 2-butyne over base-modified catalysts. In: Colloid and Polymer Science. 256, 1978, p. 287, doi : 10.1007 / BF01550594 .
- ↑ a b 1,2-butadiene (Oxeno) ( Memento from October 26, 2004 in the Internet Archive ) (PDF; 110 kB)
- ↑ 1,2-butadiene (Intergas)