(Solid plus liquid) phase equilibria of binary mixtures containing N-methyl-2-pyrrolidinone and long-chain n-alkanols at atmospheric pressure

The (solid + liquid) equilibria for N-methyl-2-pyrrolidinone + n-alkanols (1-hexanol, or 1-heptanol, or 1-octanol, or 1-decanol, or 1-undecanol, or 1-dodecanol, or 1-tetradecanol) systems have been measured by a dynamic method for the whole concentration region x(1) = 0-1. The experimental results have been correlated by four equations: Wilson, UNIQUAC ASM and two modified NRTL. The relative standard deviations of the solubility temperature correlation for all measured data vary from 0.1 to 1.4 K and depend on the particular equation used. In the calculations, the existence of two solid-solid first-order phase transitions in 1-tetradecanol has been taken into consideration. (C) 2002 Elsevier Science B.V. All rights reserved.