ENTHALPIC DETERMINATIONS OF ALIPHATIC ESTER-SOLVENT SYSTEMS WITH CORRELATIONS

Calorimetric measurements were carried out on ester-solvent systems wh ere the esters were H(CH2)(x)COO(CH2)(y) H, with x and y varying from 1 to 5, and the solvents were n-hexane and 1,2-dichloroethane. Calcula tion of the enthalpies of cavity formation enabled the enthalpies of i nteraction to be determined. Both enthalpies correlated with number of carbon atoms N, equal to x+y in the esters, giving for 1,2-dichloroet hane [GRAPHICS] From these linear correlations enthalpies of an alipha tic ester, for example, the enthalpy of vaporization can be calculated by using a thermochemical cycle. The presence of chloro atoms in the aliphatic solvent causes a large interactive effect between the ester and 1,2-dichloroethane.