Abstract
Solubility of n-butane, n-pentane, n-hexane and n-heptane vapors in polyethylene membranes was measured with an accurate gravimetric technique as a function of temperature, within the range of 258 to 318 K, and relative vapor pressure of hydrocarbons (up to 0.95). The results are analyzed with the scope of establishing a unique expression to predict the solubility of the hydrocarbon vapors. It is shown that such an expression exists and can be used with a fair degree of accuracy to estimate both solubility and solubility coefficients, in spite of the marked deviation of the experimental results from Henry's law. The effect of temperature over the whole range investigated is also well correlated, and the isoplethic heat of absorption was calculated, showing that its values are independent both of temperature and solubility. The Flory-Huggins theory was also used to analyze experimental results and the values of the interaction parameter were calculated, which can be used in turn to predict solubility and solubility coefficients of hydrocarbon vapors.
Published Version
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