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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).
Constituents of Category D are all gases and as such the evaluation
carried out for it is tailored to the physical state of the constituents
and the composition. Constituents within the Category D are not
classified for the environment or human health with the exception of
1,3-butadiene which has a human health classification. Therefore, it was
prioritised for inclusion in the ecotoxicological evaluation.
Environmental exposure was not performed for the Category D as the
representative constituents do not have any environmental
classifications. For Category D 1,3-butadiene was modelled in the
environment but only to assess man via the environment exposure and not
for any other environmental endpoint as butadiene does not have an
environmental classification. The exposure working group agreed this
approach as the most sensible approach to implement for Category D.
As per ECHA UVBC guidance, representative constituents were those with
concentration greater or equal to 10% (v/v) and/or are CMRs.
The members of this category are gases at standard temperature and
pressure and will predominantly partition to the atmosphere, which will
limit their aquatic toxicity. Consequently, conducting aquatic
ecotoxicity tests on these streams is technically difficult and based on
exposure estimates the test is not relevant.
Due to the difficulty associated with conducting aquatic toxicity tests
on these stream, experimental data are not available for the members of
this category. In the absence of measured data, the use of QSAR to
predict the ecotoxicity of representative constituents of these streams
is an appropriate technique for aquatic toxicity and it is more
appropriate to consider the toxicity of representative constituents of
ECOSAR v.1.11 (Epi Suite 4.1) has been used as key QSAR. The
representative constituents of the category studied and used as
supporting read-across are But-1-en-3-yne (CAS 689-97-4), But-1-ene (CAS
106-98-9), But-2-ene, cis- (CAS 590-18-1), But-2-ene, trans- (CAS
624-64-6), Buta-1,2-diene (CAS 590-19-2), Buta-1,3-diene (CAS 106-99-0),
Butane (CAS 106-97-8), Prop-1-ene, 2-methyl- (CAS 115-11-7), and
Propane, 2-methyl- (CAS 75-28-5).
The acute toxicity of the representative constituents of the category
were predicted to range from 12.405 mg/L to 148.62 mg/L, whereas the
chronic toxicity of representative constituents was predicted to range
from 1.563 mg/L to 13.605 mg/L for the different aquatic taxonomic
groups. These values indicate that the toxicity criteria stipulated in
Annex XIII are unlikely to be met. Therefore, this Category is
considered to be not T on the basis of the screening criterion.
CAS Numbers 92045-23-3 and 95465-89-7 are both listed in Annex VI to CLP
Annex I but are not classified for environmental hazards. Additionally
constituents Butane, 2 -Methylpropane, Butene and 2 -Methylpropene are
listed in Annex VI to CLP but are not classified for environmental
hazards. This Category would not be classified for environmental hazards.
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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