Registration Dossier
Registration Dossier
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EC number: 203-629-0 | CAS number: 108-91-8
Endpoint summary
Administrative data
Description of key information
Additional information
Henry's Law Constant
Cyclohexylamine is characterized by a measured Henry's Law Constant of 0.42 Pa*m³/mol at a temperature of 25 °C (Altschuh, 1999).
Based on a dissociation constant of 10.68 (Perrin, 1965), the substance will, under environmental relevant conditions (pH 4 to 9), be present solely in the protonated form. Therefore, the measured HLC reflects the properties of the protonated form rather than the neutral species. According to Thomas, cited in the "Handbook of Chemical property Estimation Methods" (Lyman, 1980), cyclohexylamine volatilizes only slowly from water, whereas the rate is strongly controlled by the slow diffusion through air.
Distribution modelling
Under environmental relevant conditions (pH 4 to 9), cyclohexylamine will completely be protonated. Based on Model calculations according to Mackay Level I, the target environmental compartment for the protonated form of cyclohexylamine is water (Bayer Industry Services, 2006).
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