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Vapour pressure and vapourisation enthalpy of pyridine N ‐oxide
Author(s) -
Zeng ZuoXiang,
Chen Jing,
Xue WeiLan,
Zhang Pan,
Xie Yuan
Publication year - 2012
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20655
Subject(s) - enthalpy , pyridine , standard enthalpy change of formation , vapor pressure , boiling point , chemistry , enthalpy of vaporization , thermodynamics , analytical chemistry (journal) , physics , medicinal chemistry , organic chemistry
The vapour pressure of pyridine N ‐oxide was measured using a boiling point method at different temperatures from 389.02 to 546.33 K and the constants of the Antoine equation for the substance were determined. The vapourisation enthalpy of pyridine N ‐oxide at the normal boiling point is calculated to be 58.8 ± 1.8 kJ mol −1 . Based on Othmer's method, the standard enthalpy of vapourisation ${\rm \Delta }_{{\rm vap}} H(298.15\;{\rm K})$ is estimated to be 66.6 ± 0.1 kJ mol −1 by using pyridine as the reference substance. Furthermore, Watson equation is employed to verify the reliability of ${\rm \Delta }_{{\rm vap}} H(298.15\,{\rm K})$ and the results demonstrate that the value of ${\rm \Delta }_{{\rm vap}} H(298.15\;{\rm K})$ is acceptable. © 2011 Canadian Society for Chemical Engineering