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

乙酰丙酮+DMF/DMSO/苯二元体系在303.115K和333.15K下内部扩散、密度和黏度的研究（英文）

作　　者：陈小娟 连照勋 钟海敏 陈六平 

机构地区：[1]School of Chemistry and Chemical Engineering, Sun Yat-sen University [2]School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology

出　　处：《Chinese Journal of Chemical Engineering》2015年第10期1679-1684,共6页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(20173074);the Natural Science Foundation of Guangdong Provinces(031583)

摘　　要：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(χ_1) show positive deviations in benzene but negative deviations in DMF and DMSO,whereas isotherms of △ηas a function of χ_1 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.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（VE） 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（VE and △η） were discussed as well.Isotherms of VE as a function of mole fraction of AcAc（χ1） show positive deviations in benzene but negative deviations in DMF and DMSO,whereas isotherms of △ηas a function of χ1 record positive deviations in DMF but negative in benzene and DMSO.VE 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 VE and △η were fitted to a Redlich-Kister type equation and the measured results were interpreted concerning molecular interactions in the solutions.

关 键 词：Intradiffusion coefficient DENSITY VISCOSITY ACETYLACETONE 1H DOSY PFG NMR method 

分 类 号：O621.2[理学—有机化学]