The vaporization kinetics of hydrogen bonded alcohols (n-butanol, iso-butanol, npentanol and iIo-pentanol) in air bave been studied at temperatures from 25 - 500C, under atmospheric pressure c~ditions. From the experimental vaporization curves, the activation enthalpy of vaporization was computed. A comparison between the observed vaporization rate Jobs, and the maximum possible rate Jmax, computed from the well known Langmuir equation, yielded the vaporization coefficient cy From JJilax curves, the enthalpy of vaporization ~Hv' has also been calculated. Attempt has been made to correlate the activation enthalpy of vaporization ~"v *, with the number of hydrogen bonds broken in the alcohol cluster during the vaporization process.
J IQBAL ,M SALEEM ,M AFZAL ,
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