کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5408489 | 1506529 | 2017 | 28 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Conductivity and dissociation behavior of l(+)-lactic acid in the aqueous solutions of (1-butyl-4-methylpyridinium halide, 1-butyl-3-methylimidazolium halide + polyethylene glycol) at different temperatures
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
In this paper, the effect of some ionic liquids on the conductivity behavior of l(+)-lactic acid was studied in polyethylene glycol aqueous solutions. The molar conductivities of l(+)-lactic acid in the aqueous solutions of polyethylene glycol, polyethylene glycol + 1-butyl-3-methylimidazolium bromide, polyethylene glycol + 1-butyl-3-methylimidazolium chloride, polyethylene glycol + 1-butyl-4-methylpyridinium bromide, and polyethylene glycol + 1-butyl-4-methylpyridinium chloride were measured at the temperature ranges of (288.15-318.15) K. The molar conductivity data were correlated using Quint-Viallard (QV) conductivity equation to calculate the limiting molar conductivities (Î0) and dissociation constants (KD). The results show that limiting molar conductivity increase by increasing both of the anion size and acidic power of ILs cation. The KD values were also used to calculate the dissociation standard thermodynamic functions (ÎGD0, ÎSD0, and ÎHD0). The values of ÎGD0 are positive and become more positive at higher temperatures. This implies that the dissociation of the acid is controlled by entropy term.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 242, September 2017, Pages 884-891
Journal: Journal of Molecular Liquids - Volume 242, September 2017, Pages 884-891
نویسندگان
Hemayat Shekaari, Abbas Mehrdad, Narmin Noorani,