Abstract
We report measurements of the vapor-liquid equilibrium of pyrrolidine, and of binary mixtures of pyrrolidine separately with cyclohexane at 313.15 and 333.15 K, with water at 333.15 and 353.15 K, with ethanol at 313.15 and 333.35 K, and with tetrahydrofuran at 313.35 and 333-35 K. These data are correlated with five liquid activity coefficient models by the maximum likelihood parameter estimation method, including a correction for nonideal vapor-phase behavior. A comparison of our data with the predictions of the UNIFAC model is also included. The prediction of the UNIFAC model is so poor that a new functional group for the cyclic secondary amine group should be defined. In contrast, the prediction of the DISQUAC model is in excellent agreement with our data
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