Registration Dossier
Registration Dossier
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EC number: 270-724-1 | CAS number: 68477-33-8 A complex combination of hydrocarbons from the distillation of saturated and unsaturated hydrocarbons usually ranging in carbon numbers from C3 through C6, predominantly butane and isobutane. It consists of saturated and unsaturated hydrocarbons having carbon numbers in the range of C3 through C4, predominantly isobutane.
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The members of category C4, high 1,3-butadiene (≥0.1%) have partition coefficients that ranges between log Kow 2.09 to 2.31.
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 2.28
- at the temperature of:
- 20 °C
Additional information
Measured data were not available for the members of category C4, high 1,3-butadiene (≥ 0.1%).
Log partition co-efficient data were calculated for members of the category [68476-52-8: 2.31, 68477-42-9: 2.09, 68955-28-2: 2.00, 87741-01-3: 2.31] using the KOWWIN programme in EPISuite V4 (2009) as the structure of the stream fits the parameters of the model. The log Kow for category C4, high 1,3-butadiene (≥ 0.1%) is therefore taken to range from 2.09 to 2.31. In support of this, data were read across from a peer reviewed handbook (Hansch 1995) on 2-butene: 2.31 to 2.33, but-1-ene: 2.4 and 2-methylpropene: 2.34 which have a comparable structure to the members of the category.
The mean of the partition coefficient values for the category is 2.28 and this has been used to complete the 'key value for chemical safety assessment'.
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