Intradiffusion, density and viscosity studies in binary liquid systems of acetylacetone + DMF/DMSO/benzene at 303.15 K and 333.15 K

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• 作者：Xiaojuan Chen¹ ; Zhaoxun Lian² ; Haimin Zhong¹ ; Liuping Chen¹ ; ^{cesclp@mail.sysu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Intradiffusion coefficient ; Density ; Viscosity ; Acetylacetone ; 1H DOSY PFG NMR method
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：23
• 期：10
• 页码：1679-1684
• 全文大小：395 K

文摘

Intradiffusion coefficients of acetylacetone (AcAc) and DMF/DMSO/benzene in binary systems over the entire concentration range at 303.15 K were determined by ¹H diffusion-order spectroscopy (DOSY) nuclear magnetic resonance (NMR) method based pulse field gradient (PFG). The densities and viscosities of the above three binary systems at 303.15 K were also studied and employed to calculate the excess molar volumes (V^E) and deviations in viscosity (∆η). Besides, experiments were carried out at 333.15 K for the system of AcAc + DMF. The solvent and temperature effect upon the difference in D between enol and keto tautomers, the tautomeric equilibrium and excess properties (V^E and ∆η) were discussed as well. Isotherms of V^E as a function of mole fraction of AcAc (x₁) show positive deviations in benzene but negative deviations in DMF and DMSO, whereas isotherms of ∆η as a function of x₁ record positive deviations in DMF but negative in benzene and DMSO. V^E values show more negative and ∆η values are less positive in the system of AcAc + DMF at 333.15 K compared to 303.15 K. The V^E and ∆η were fitted to a Redlich–Kister type equation and the measured results were interpreted concerning molecular interactions in the solutions.