Calorimetric measurement of molar excess enthalpies of dilute solutions of ethylbenzene plus higher n-alkanes

Flow calorimetry has been used to measure the excess enthalpies (heats of mixing) of dilute solutions of higher n-alkanes (hexadecane to pentacosane) in ethylbenzene. The results show that at constant temperature and composition, h(E) increases with the number of carbon atoms in the n-alkane molecule. Also, for each alkane, h(E) decreases with increasing temperature, at constant composition. A simple analytical expression is used to represent the variation of h(E) with carbon number n, composition x, and temperature T in the domain (16 less than or equal to n less than or equal to 25; x less than or equal to 0.15; 298.15 less than or equal to T less than or equal to 330.00). (C) 1997 Elsevier Science B.V.