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首页> 外文期刊>Fluid Phase Equilibria >Excess molar volumes and excess molar enthalpies for binary mixtures of 1,2-dichloropropane with methyl ethanoate, methyl propanoate, and methyl butanoate at T=298.15K
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Excess molar volumes and excess molar enthalpies for binary mixtures of 1,2-dichloropropane with methyl ethanoate, methyl propanoate, and methyl butanoate at T=298.15K

机译：1,2-二氯丙烷与乙酸甲酯，丙酸甲酯和丁酸甲酯的二元混合物的过量摩尔体积和过量焓焓在T = 298.15K

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摘要

The excess molar volumes VmE and excess molar enthalpies HmE have been measured for the binary mixtures of {1,2-dichloropropane+methyl ethanoate, or +methyl propanoate, or +methyl butanoate} using a densimeter and an isothermal microcalorimeter, respectively, at T=298.15K and P=1atm. The HmE values of all binary mixtures are negative while VmE values are positive over the whole composition range. Both VmE and HmE values decrease with an increase of molecular weight of methyl esters. The maximum negative values of HmE for these binary systems were observed at x_1=0.45-0.51. But, the maximum positive values of VmE lie at 0.49-0.65 mole fraction of 1,2-dichloropropane. The experimental results are discussed in terms of intermolecular interactions, particularly the self-association by dipole-dipole attraction between like and unlike molecules and formation of empty space around the molecules in the mixtures. The experimental data were correlated by three local-composition models (Wilson, NRTL, and UNIQUAC). Out of three models, NRTL equation provides the most appropriate correlating results except the binary system containing methyl butanoate.
机译：分别使用密度计和等温微热量计分别测量了{1,2-二氯丙烷+乙醇酸甲酯，+丙酸甲酯或+丁酸甲酯}的二元混合物的过量摩尔体积VmE和过量摩尔焓HmE。 = 298.15K，P = 1atm。在整个组成范围内，所有二元混合物的HmE值为负，而VmE值为正。 VmE和HmE值均随甲基酯分子量的增加而降低。对于这些二元系统，HmE的最大负值在x_1 = 0.45-0.51处观察到。但是，VmE的最大正值为1，2-二氯丙烷的0.49-0.65摩尔分数。根据分子间的相互作用，特别是相似和不相似分子之间的偶极-偶极吸引作用以及混合物中分子周围空空间的形成，对实验结果进行了讨论。实验数据通过三个局部组成模型（Wilson，NRTL和UNIQUAC）进行关联。在这三个模型中，NRTL方程提供了最合适的相关结果，除了包含丁酸甲酯的二元系统。

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