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EC number: -
CAS number: -
The reference substance “2-propanol and 2-butanol production,
distn. residues” consists of moderately volatile organic substances
(overall vapour pressure 72 hPa at 20 °C, all known constituents in the
range of 5 – 250 hPa at 20 °C considered as moderately volatile of
relatively low molecular weight (average ca. 107 g/mol).
An overall Henry’s law constant (H) calculated from the parameters
used for exposure assessment is 163 Pa m³/mol (at 20 °C). According to
the ECHA TGD IR & CSA, 2008, R7a (p. 191), chemicals with H values
around 100 Pa m³/mol will tend to partition from water to air at a
significant rate. At the same time, the reaction mass is soluble in
water (solubility of 1 – 10 g/L). Values for individual components vary
with DIPE having a higher vapour pressure (199 hPa at 25 °C) than the
other components and TBA and SBA a higher water solubility (> 100 g/L).
DSBE was estimated to be only moderately water soluble (ca. 0.3 g/L) and
at the same time has a relatively low vapour pressure (estimated 22 - 30
hPa at 25 °C), similar to TBA and SBA. Due to these differences DIPE and
DSBE are predicted to volatilize relatively rapidly based on estimated
Henry’s law constants and therefore to be present mainly in the air
compartment, while TBA and SBA will mainly remain in the water
compartment. SBA will be rapidly degraded biotically, while TBA is only
inherently biodegradable and may therefore remain longer in the aquatic
compartment. DIPE and DSBE are not readily biodegradable, but will be
rapidly oxidized in the atmosphere (estimated atmospheric oxidation
half-lives of ca. 4 - 5 hours).
DIPE, TBA and SBA show a low potential for adsorption as log Pow
values, based on literature data and a measurement with the reaction
mass using the HPLC method, are below 3. Only for DSBE a log Pow between
2.9 – 3.8 and a corresponding log Koc of 2.1 (Koc = 132) that can likely
be assigned to DSBE, indicates a moderate potential for adsorption.
Chemicals with a Koc value between 150 and 500 are likely to move
through the soil at a moderate rate . Strong binding to soil
particles is only expected for a log Pow > 5 or log Koc > 4 and
adsorption to sediment it not expected below a log Koc of 2.7 - 3 (ECHA,
TGD IR & CSA, 2008, R7 p.154). Therefore, DSBE is not predicted to
persist in soils. None of the constituents present in the reaction mass
is expected to bioaccumulate (see chapter 8).
 Swann RL, Laskowshi DA, McCall PJ, Vander-Kuy K and Disburger
HJ (1983). A rapid method for the estimation of the environmental
parameters octanol/water partition coefficient, soil sorption constant,
water to air ratio and water solubility. Residue Reviews 85, 17 - 28.
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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