| 초록 |
Excess molar enthalpiesHEm at T=298.15 K and atmospheric pressure for the ternary mixture {x11,2-dichloropropane (1,2-DCP) + x22-pentanol + (1-x1-x2)3-pentanol} and its constituent binary system {x'12-pentanol +x'23-pentanol} have been determined over the whole composition range. Values of excess molar enthalpies were measured using an isothermal micro-calorimeter with flow-mixing cell. In studying the ternary system, excess molar enthalpiesHEm,123[= HEm,1+23 + (1-x)HEm,23] were obtained by measuring HEm,1+23 values for pseudo-binary mixtures resulting from adding 1,2-DCP to binary mixtures composed of {x'12-pentanol + x'23-pentanol} having a fixed molar ratio x'1 /x'2 0.33, 0.98 and 2.94. HEm values of the ternary and constituent binary mixtures are positive over the whole composition range. Experimental results of the constituent binary mixtures were fitted to the Redlich-Kister polynomial equation to obtain the binary coefficients. Curves of constant excess molar enthalpies on mixing were plotted in the triangle diagram. Comparison of the predictions by Radojkovi equation with experimentalHEm values was made. |
