| 초록 |
The excess molar volumes VE and excess molar enthalpies HE have been measured as a function of 1,2-dichloropropane (1,2-DCP) composition at T=298.15 K and atmospheric pressure of the following set of systems {1,2-DCP + methyl esters (methyl acetate, methyl propionate, and methyl butyrate)} from density and heat of mixing, respectively.TheHE values of all binary mixtures are negative whileVE values are positive over the whole composition range. BothVEandHE values decrease with an increase of molecular weight of methyl esters. The maximum negative values ofHE have been shown ranging from 202.3 Jmol-1 (methyl acetate) to 338.3 Jmol-1 (methyl butyrate) at= 0.45∼0.50. Similarly, the maximum positiveVE values shift from 0.0592 cm3 mol-1 for the mixture with methyl butyrate to 0.1615 cm3 mol-1 for the mixture with methyl acetate at= 0.49∼0.64.The experimental results of both VE and HE were fitted to Redlich-Kister equation to correlate the composition dependence. The experimentalHE data were also used to test the suitability of Wilson, NRTL, and UNIQUAC models. |
