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 pen tacosane) in ethylbenzene. The results show that at constant temperatu re and composition, h(E) increases with the number of carbon atoms in the n-alkane molecule. Also, for each alkane, h(E) decreases with incr easing temperature, at constant composition. A simple analytical expre ssion 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 l ess than or equal to T less than or equal to 330.00). (C) 1997 Elsevie r Science B.V.