Vapor pressure determination of propylene carbonate and iso-propyl benzoate Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/f1881p763

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  • The vapor pressures of propylene carbonate and iso-propyl benzoate were measured by the comparative ebulliometric method. The range of vapor pressures were from 24.8 mm Hg to 620 mm Hg for propylene carbonate and from 56.2 mm Hg to 760 mm Hg for iso-propyl benzoate. To correlate the experimental data the Antoine and the Clausius-Clapyron equations were used and hence the constants of these equations were derived. The method of least squares was used for curve fitting. It was concluded that the vapor pressure data obtained in this work does not completely satisfy the Clausius-Clapyron equation, which is indicative that the heat of vaporization of both compounds depend on, and vary with, the boiling temperature. On the other hand, the data showed excellent agreement with the Antoine equation. The maximum deviation calculated for the Antoine equation was on the order of 0.06 percent for propylene carbonate and 0.03 percent for iso-propyl benzoate.
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