Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

(Solid + liquid) phase diagrams, SLE have been determined for (octan-1-ol, or nonan-1-ol, or decan-1-ol, or undecan-1-ol + benzonitrile) and for (hexylamine, or octylamine, or decylamine, or 1,3-diaminopropane + benzonitrile) using a cryometric dynamic method at atmospheric pressure. Simple eutectic systems with complete immiscibility in the solid phase and complete miscibility on the liquid phase have been observed. The solubility decreases with an increase of the number of carbon atoms in the alkan-1-ol, or amine chain. The temperature of the eutectic points increases and shifts to lower alkan-1-ol, or amine mole fractions as the alkyl chain length of the alkan-1-ol, or amine increases. The higher intermolecular interaction was observed for the (alkan-1-ol + benzonitrile) systems. The experimental solubility results are compared with values calculated by means of the NRTL equation utilizing parameters derived from the SLE results. The existence of a solid solid first order phase transition in undecan-1-ol has been taken into consideration in the calculations. The correlation of the solubility data has been obtained with the average root-mean-square deviation o less than 1.0 K. (Solid liquid) equilibria, for the ternary system (decylamine + decan-1-ol + benzonitrile) have been determined at three temperatures 273.15, 278.15 and 283.15K using the same cryometric dynamic method at atmospheric pressure. The experimental results show the existence of a solid addition compound with the empirical formulae: C10H23N*C10H21OH. This compound is congruently melting compound. The addition of benzonitrile to the binary system causes a lowering of the melting temperature of the congruently melting compound.