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EC number: 295-405-4
CAS number: 92045-23-3
A complex combination of hydrocarbons produced by the distillation of the products of a steam cracking process. It consists predominantly of hydrocarbons having a carbon number of C4, predominantly 1-butene and 2-butene, containing also butane and isobutene and boiling in the range of approximately minus 12°C to 5°C (10.4°F to 41°F).
The calculated Henry's Law constant is 7150 (1,3-butadiene) to 98200 (butane) Pa m³/mol
Henry's Law constants for representative substances were: 1,3-butadiene:
7900 and 7150 Pa
m³/mol, butane: 98200 and 85900 Pa
m³/mol and 2–butene: 24300 and
m³/mol for bond contribution and group contribution methods
respectively. The results have been
calculated by a QSAR model with two modules recommended in ECHA (2008)
Guidance on information requirements and chemical safety assessment R7a
Endpoint specific guidance. The calculated values indicate that
volatilisation from water is expected to occur at a rapid rate.
The mean of
the Henry's Law values for the category is 39840 Pa m³/mol at 25°C and
this has been used to complete the 'key value for chemical safety
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