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EC number: 204-427-5
CAS number: 120-80-9
From the equation above
mentionned, Vp = 0.003 kPa at 20°C (value adopted by HSDB), and 0.005 kPa at 25°C.
However, since Pyrocatechol has a melting point of 105°C (<118.5-245.5°C used for the generation of the equation), the extrapolated VP refers to a
"super-cooled" liquid, and not the solid. The "super-cooled" value can be further extrapolated to the solid-phase VP using various methods which
will lower the super-cooled value by a factor of 6 to 11 (Bill Meylan, personal communication).
In this study, the authors developped a
equation to extrapolate the vapour pressure at 25°C from values measured
at temperatures ranging from 118.5 to 245.5°C. By doing so, they
reported a vapour pressure of 0.005 kPa at 25°C for catechol.
Several peer-reviewed handbooks report
vapour pressure ranging from 6.66 to 533 hPa in the temperature range
from 104 to 221.5°C for catechol.
Range of vapour pressure:0.05 hPa at 25°C;6.66 hPa at 104°C;13.3 hPa at 118.3°C;53.3 hPa at 150.6°C;133 hPa at 176°C;266 hPa at 197.7°C;533 hPa at 221.5°C
handbooks and a publication give consistent values in a range of
temperatures between 25 and 221.5°C. No key
study was chosen and a "weight of evidence" approach was applied.
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