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EC number: 204-066-3
CAS number: 115-11-7
The vapour pressure of butenes was determined to be 484-1160 kPa at
25°C, depending on the isomer. The endpoint value was extrapolated from
lower temperatures for the different butene structures.
accordance with REACH Annex XI, this study does not need to be conducted
as it is technically not possible. These substances have a vapour
pressure above the limit of detection of the guideline methods. In
accordance with ECHA (2008) Guidance on information requirements and
chemical safety assessment chapter R.7a, the vapour pressure study is
not required for a substance with a boiling point <30°C as these
substances will have a vapour pressure above the limit of measurement
(i.e. 10^5 Pa). As the boiling point of butenes ranges from -6.26°C to
3.71°C, this endpoint can be waived.
is supported by data from the CRC Handbook (Lide 2008) and Zwolinski and
Wilhoit (1971). No information on the methods used is available.
However, the information is taken from reliable peer reviewed handbooks
and is considered reliable and suitable for use for this endpoint.
According to the CRC Handbook, the vapour pressure of butenes was
determined to be 484 kPa - 1160 kPa at 25°C. The endpoint value was
extrapolated from values at lower temperatures for the different butene
structures. Vapour pressure values are available for 2-methylpropene
(1160 kPa at 25°C), but-1-ene (1100 kPa at 25°C) and 2-butene (484 kPa -
605 kPa at 25°C). The mean of the vapour pressure values for the butenes
is 837.25 kPa at 25°C and this has been used to complete the 'key value
for chemical safety assessment'.
to Zwolinski and Wilhoit (1971), the vapour pressure of butenes was
determined to be 141 kPa - 206 kPa at 12.8°C. The endpoint was
determined by extrapolation using the Antonine equation. The vapour
pressure at 12.8°C was determined to be 206.2 kPa for 2-methylpropene,
201.3 kPa for but-1-ene and141.3 kPa – 156.1 kPa for 2-butene.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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