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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 kinetic rate constant for the reaction
of members of the category with OH radicals is measured to be 2.632 E-11
to 66.6 E-12 cm3/mol/s, indicating that the atmospheric half-life in air
(with OH radicals) ranges from 0.161 days (1,3-butadiene) to 4.064 days
(butane). The kinetic rate constant for the reaction of members of the
category with ozone is measured to be 0.81 E-17 to 20 E-17 cm3/mol/s,
indicating that the atmospheric half-life in air (with ozone) ranges
from 1.375 days (cis 2-butene) to 2.116 days (trans 2-butene).
members of this category are gases, the most dominant environmental fate
process will be photooxidation. Representative substances in this
category have been shown to react rapidly with hydroxyl radicals and
ozone. The reaction with ozone is less rapid, and therefore less
important than the reaction with hydroxyl radicals. However, at night,
when the concentration of hydroxyl radicals falls to negligible levels,
this removal mechanism will become more important. It is expected that
the members of this category will be rapidly removed from the atmosphere
(1989) wrote a review article, with no data reported on the test methods
or conditions of the original data source. Never-the-less, the data are
taken from a published, peer-reviewed journal article and are considered
to be suitable for this endpoint. The measured results provide a rate
constant of the reaction of OH radicals with three members of category
(1,3-butadiene: 66.6 E-12 cm3/mol/s, butane: 2.632 E-12 cm3/mol/s,
2-butene: 56.67 (cis), 64.27 (trans) E-12 cm3/mol/s). The
results indicate that the category would have an atmospheric half-life
of approximately 0.161 days (1,3-butadiene), 4.064 days (butane) and
2.265 days (cis), 1.997 days (trans) (2-butene) and therefore would not
be persistent in the atmospheric compartment.
reaction with ozone in air the measured results provide a rate constant
of the reaction of ozone with two members of the category
(1,3-butadiene: 0.81 E-17 cm3/mol/s, 2-butene: 20.0 (cis),
13.0 (trans) E-17 cm3/mol/s). The results indicate that the
category would have an atmospheric half-life of approximately 1.415 days
(1,3-butadiene) and 1.375 days (cis), 2.116 days (trans) (2-butene) and
therefore would not be persistent in the atmospheric compartment.
The mean of
the atmospheric half-life values for the category in is 2.12 days with
OH radicals and this has been used to complete the 'key value for
chemical safety assessment'.
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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