Temperature Dependence of the Volumetric Properties of Binary Mixtures Containing Polyethers and 1‐Propanol

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• 作者：Pal ; A. ; Kumar ; A.
• 关键词：binary mixtures ; excess volume ; polyethers ; 1 ; propanol ; temperature
• 刊名：International Journal of Thermophysics
• 出版时间：2003
• 出版年：2003
• 期刊代码：33_0195928X
• 类别：ch
• 卷：24
• 期：4
• 页码：1073-1087
• 数据来源：sp

摘要

Excess molar volumes (V^E_m) were measured at 288.15, 298.15, and 308.15 K and atmospheric pressure as a function of composition with a continuous dilution dilatometer for the binary mixtures of 1‐propanol [CH₃CH₂CH₂OH] with glymes [CH₃O(CH₂CH₂O)_mCH₃, m=1,2,3, and 4]. With these results and other thermodynamic data from the literature, the following mixing quantities have been reported over the complete range of concentration or at equimolar concentration: α, volume expansivity; α^E, excess volume expansivity; (∂V^E_m/∂T)_P, and (∂H^E/∂P)_T at 298.15 K. The Prigogine–Flory–Patterson theory (PFP) of liquid mixtures has been applied to estimate interaction, free-volume, and internal-pressure contributions to V^E_m and to estimate the different mixing quantities for the mixtures. The calculated values using the PFP theory were then compared at 298.15 K with the experimentally obtained results. The PFP theory predicts excess volume V^E_m values rather well, while the calculated value of (∂V^E_m/∂T)_P and (∂H^E/∂P)_T by using the Flory theory show general variation with the chain length of the glyme. The (∂V^E_m/∂T)_P and (∂H^E/∂P)_T show deviations between theoretical and experimental values that are slightly larger in systems with lower glyme.