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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).
Vapour pressure data were read across from
the butene substances (2-methylpropene, but-1-ene and 2-butene) to
members of the C4, high 1,3 -butadiene (≥ 0.1%) category. The vapour
pressures ranged from 484 to 1160 kPa at 25°C.
pressure data were read across from the butene substances
(2-methylpropene: 1160 kPa at 25°C, but-1-ene: 1100 kPa at 25°C
and 2-butene: 484 to 605 kPa at 25°C) for members of the category. The
data were taken from the CRC handbook (Lide 2008), which is peer
reviewed and considered a reliable source. The substances are C4
hydrocarbons and have a similar structure to the members of the category
C4, high 1,3 -butadiene (≥0.1%).
Due to their similar structures, they can be predicted to have similar
physico-chemical properties and so read across from the butene
substances is considered acceptable.
vapour pressure ranged from 484 to 1160 kPa at 25°C, and this range is
considered to be representative of category C4, high 1,3 -butadiene (≥0.1%).
mean of the vapour pressure values for the category is 837.25 kPa at 25°C
and this has been used to complete the 'key value for chemical safety
the ECETOC TRA, any substance with a vapour pressure higher than 10 kPa
is assigned a transfer to air factor of 1 (i.e. 100%) and the substance
is considered to be completely released to air instantly. This is
exactly what would happen to butadiene if it was to leak or be released
into the environment. Therefore the model's basic underlying assumption
is applicable to our substance.
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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