Abstract
Vapor pressures (P sat) of benzene and several chlorinated benzenes, between −15°C and 40°C, were calculated from the ideal gas law using a generator system to measure the saturation concentration of chemical in air at the temperature of interest. The P sat values were observed to increase with temperature, decrease with chlorine content, and fit the Clausius-Clapeyron equation (r 2 = 0.958–0.998). Enthalpies of transition for the chlorinated benzenes, from their natural state to vapor, were also observed to increase with chlorine substitution. Correlations of thermodynamic coefficients with chlorine number provided estimates of P sat within a factor of 2 to 3. The modified Watson method, which uses the boiling point temperature of the chemical as the only independent variable, accurately predicted (±20%) P sat of liquid chlorinated benzenes; however, vapor pressures of solid chlorinated benzenes were estimated with errors as large as one order of magnitude with this method.
Published Version
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