Volumetric Properties of Binary System C6H5CH3-DMF at 293.15 K

Chem. J. Chinese Universities ›› 2009, Vol. 30 ›› Issue (7): 1386.

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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.

Abstract

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:

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

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Volumetric Properties of Binary System C₆H₅CH₃-DMF at 293.15 K

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