二元体系C6H5CH3-DMF在293.15 K时的体积性质

高等学校化学学报 ›› 2009, Vol. 30 ›› Issue (7): 1386.

二元体系C₆H₅CH₃-DMF在293.15 K时的体积性质

侯海云¹, 王晓先¹, 彭三军², 耿信鹏¹

1. 西安工程大学环境与化学工程学院, 西安 710048;
2. 长沙理工大学化学与环境工程学院, 长沙 410076

收稿日期:2008-08-27 出版日期:2009-07-10 发布日期:2009-07-10
通讯作者: 侯海云, 女, 博士, 副教授, 主要从事溶液化学和胶体与界面化学研究. E-mail: houhaiyun77@126.com
基金资助:
国家自然科学基金(批准号: 20673080)和西安工程大学科研启动基金(批准号: BS07047)资助.

Volumetric Properties of Binary System C₆H₅CH₃-DMF at 293.15 K

HOU Hai-Yun^1*, WANG Xiao-Xian¹, PENG San-Jun², GENG Xin-Peng¹

1. College of Environmental and Chemical Engineering, Xi′an Polytechnic University, Xi′an 710048, China;
2. Department of Chemistry and Environmental Engineering, Changsha University of Science and Technology, Changsha 410076, China

Received:2008-08-27 Online:2009-07-10 Published:2009-07-10
Contact: HOU Hai-Yun. E-mail: houhaiyun77@126.com
Supported by:
国家自然科学基金(批准号: 20673080)和西安工程大学科研启动基金(批准号: BS07047)资助.

摘要/Abstract

摘要：

利用Anton Paar DMA4500振动管密度计测量了293.15 K时二元体系甲苯-N,N-二甲基甲酰胺(C₆H₅CH₃-DMF)在C₆H₅CH₃(摩尔分数0~1)中的溶液密度, 利用最小二乘法关联了溶液密度与组成的函数关系, 关联精度为±0.005 kg/m³. 通过密度数据分别计算了二元体系中C₆H₅CH₃和DMF的表观摩尔体积, 并利用非线性最小二乘拟合法, 分别拟合得到了优化的C₆H₅CH₃和DMF的表观摩尔体积和摩尔分数的函数关系, 以及C₆H₅CH₃和DMF的表观摩尔体积和质量分数的函数关系. 通过对函数关系的极限运算得到了C₆H₅CH₃和DMF的极限偏摩尔体积、标准偏摩尔体积和摩尔体积. 还计算了不同组分下体系的超额摩尔体积, 数据可用四参数Redlich-Kister方程关联拟合得到方程系数. 计算关联了C₆H₅CH₃和DMF的超额偏摩尔体积与摩尔分数的关系. 由三参数多项式极限法得到组分的极限超额偏摩尔体积值与Redlich-Kister系数法得到的值在误差范围内一致.

关键词: 甲苯-N,N-二甲基甲酰胺; 表观摩尔体积; 超额摩尔体积; 极限偏摩尔体积; 标准偏摩尔体积; 超额偏摩尔体积; 极限超额偏摩尔体积

Abstract:

The densities of binary solution C₆H₅CH₃-DMF(toluene-N,N-dimethylformamide) at 293.15 K were measured by use of the Anton Paar 4500 vibrating-tube densimeter and the dependence of density on molar fraction was fitted by the least-square method with the standard deviation 0.005 kg/m³, the molar fractions of toluene for the binary solution is from 0 to 1. The apparent molar volumes of C₆H₅CH₃ and DMF in the binary system C₆H₅CH₃-DMF were separately calculated from the density data, and the optimized dependences between apparent molar volumes and molar fractions and mass fractions were also determined respectively by the nonlinear least-square regression, and further more, the limiting partial molar volumes, the standard partial molar volumes and the molar volumes of C₆H₅CH₃ and DMF were also obtained from the functions limits. At the same time, the excess molar volumes for the binary solution were calculated and were fitted by the fourth-order Redlich-Kister equation well, so the Redlich-Kister coefficients and the excess molar volume extremum were obtained. Furthermore, the excess partial molar volumes of C₆H₅CH₃ and DMF were calculated and the dependences of the excess partial molar volumes on molar fractions of C₆H₅CH₃ were fitted with the three-parameter polynomial. The limiting excess partial molar volumes of C₆H₅CH₃ and DMF were also obtained from the polynomials limits as well as from the Redlich-Kister equation coefficients.

Key words: Toluene-N,N-dimethylformamide; Apparent molar volume; Excess molar volume; Limiting partial molar volume; Standard partial molar volume; Excess partial molar volume; Limiting excess partial molar volume

TrendMD:

侯海云, 王晓先, 彭三军, 耿信鹏. 二元体系C₆H₅CH₃-DMF在293.15 K时的体积性质. 高等学校化学学报, 2009, 30(7): 1386.

HOU Hai-Yun*, WANG Xiao-Xian, PENG San-Jun, GENG Xin-Peng. Volumetric Properties of Binary System C₆H₅CH₃-DMF at 293.15 K. Chem. J. Chinese Universities, 2009, 30(7): 1386.

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二元体系C₆H₅CH₃-DMF在293.15 K时的体积性质

Volumetric Properties of Binary System C₆H₅CH₃-DMF at 293.15 K

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