کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9625956 | 460751 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Viscosities and densities for binary mixtures of N-methylpiperazine with methanol, ethanol, n-propanol, iso-propanol, n-butanol and iso-butanol at 293.15, 298.15 and 303.15Â K
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Viscosity (η) and density (Ï) values are reported for binary mixtures of N-methylpiperazine (NMP) with methanol, ethanol, n-propanol, iso-propanol, n-butanol and iso-butanol over the entire range of mole fraction at 293.15, 298.15, and 303.15 K and atmospheric pressure. The viscosity deviation (Îη), excess molar volume (VE), and excess Gibbs energy of activation (G*E) have been calculated. These results were fitted with Redlich-Kister type polynomial equation. All the investigated systems exhibit very large positive values of Îη and G*E, and negative values of VE over the whole composition range. The obvious deviations attribute to the strong cross association between the alkanol and NMP molecules through the hydrogen bond of OHâ¯N. The temperature has significant effect on Îη and relatively slight effect on VE and G*E. From the experimental data, the thermodynamic functions of activation have been estimated for each binary mixture. The viscosity data have been correlated with several semi-empirical equations. Two-parameter equation of McAllister can give satisfactory results.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Fluid Phase Equilibria - Volume 234, Issues 1â2, 28 July 2005, Pages 22-33
Journal: Fluid Phase Equilibria - Volume 234, Issues 1â2, 28 July 2005, Pages 22-33
نویسندگان
Shu-da Chen, Qun-fang Lei, Wen-jun Fang,