Excess molar volumes and molar enthalpies in the binary mixtures of {x1CH3CHClCH2Cl+x2CH3(CH2) n−1OH} (n=1 to 4) at T=298.15K

摘要: The excess molar volumes V and enthalpies H at T=298.15 K atmospheric pressure for the binary systems {x1CH3CHClCH2Cl+x2CH3(CH2) n−1OH} (n=1 to 4) have been determined from density measurements by using a digital vibrating-tube densimeter an isothermal calorimeter with flow-mixing cell, respectively. 1-alkanols are methanol, ethanol, 1-propanol 1-butanol. values of mixtures increase chain length 1-alkanols, resulting in entire negative ‘S-shaped’ being nega- tive low positive high mole fraction 1,2-dichloropropane, both 1- butanol. all show endothermic effect (positive values), which exhibits regular magnitude when number -CH2- group is progressively increased maximum varying 741 J·mol−1 (methanol) 1,249 (1-butanol) around x1=0.63−0.72. experimental results were fitted Redlich-Kister equation correlate composition dependence. data also used test suitability Wilson, NRTL, UNIQUAC models. correlation enthalpy these model provides most appropriate except system containing methanol.