THERMODYNAMICS OF THE BINARY-MIXTURES OF 2-HEPTANONE WITH AN N-ALKANOL AT 298.15-K

Excess molar enthalpies H(m)E at 298.15 K and atmospheric pressure for the five binary mixtures of 2-heptanone with n-propanol, n-pentanol, n-hexanol, n-heptanol and n-octanol have been obtained over the whole mole fraction range using a Calvet microcalorimeter. In addition, a vi brating-tube digital densimeter was used to determine the excess molar volumes V(m)E at the same temperature and pressure for the four diffe rent binary mixtures of 2-heptanone with n-propanol, n-hexanol, n-hept anol and n-octanol. The results show that all the systems are endother mic; H(m)E values increase with the number of carbons of the alkanol. The excess molar volumes are sigmoid for n-propanol and increasingly p ositive for the large alkanols. Two methods of correlating the results with a variable-degree polynomial are examined. The experimental resu lts are compared with the predictions of Prigogine- Flory-Patterson th eory.