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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).
Based on the physicochemical properties, the
members of theC4,
high 1.3-butadiene (≥0.1%)
can be expected to have a low
potential for adsorption (Kow < 3).
Based on the Henry's Law Constant range of
7150 to 98200 Pa m³/mol, the estimated half-life of streams in this
category ranges from 45.4 to 46.7 minutes in a river and 69.9 to 72.4
hours in a lake. Based on Pedersen et al (1995), these substances would
meet the criteria for total degradation of half-life <6 days, which is
equivalent to removal from the water phase of >95% in 28 days, therefore
the members in this category are not expected to be persistent in the environment.
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