Excess molar volumes and excess viscosities for mixtures of N,N-dimethylformamide with methanol, ethanol and 2-propanol at different temperatures

Speeds of sound and density for binary mixtures of ethyl benzoate (EB) with N,N-dimethylformamide (NNDMF), N,N-dimethyl acetamide (NNDMAc), and N,N-dimethylaniline (NNDMA) were measured as a function of mole fraction at temperatures 303.15, 308.15 K, 313.15 K, and 318.15 K and atmospheric pressure. From the experimental data, adiabatic compressibility ( ad ), intermolecular free length ( ), and molar volume ( ) have been computed. The excess values of the above parameters were also evaluated and discussed in light of molecular interactions. Deviation in adiabatic compressibilities and excess intermolecular free length ( ) are found to be negative over the molefraction of ethyl benzoate indicating the presence of strong interactions between the molecules. The negative excess molar volume values are attributed to strong dipole-dipole interactions between unlike molecules in the mixtures. The binary data of Δ ad , , and were correlated as a function of molefraction by using the Redlich-Kister equation.

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“…The sign of of a system depends upon the relative magnitude of expansion and contraction of the two liquids due to mixing [38].…”

Section: Resultsmentioning

confidence: 99%

“…Significant structural effects are absent due to the lack of hydrogen bonds. Therefore, it acts as an aprotic protophilic solvent [6]. NNDMAc is a dipolar aprotic solvent and is moderately structured [7].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Acoustic Study on Molecular Interactions in Certain Binary Liquid Systems Involving Ethyl Benzoate

Nagarjun

Sarma

Gv³

et al. 2013

Journal of Thermodynamics

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“…We are engaged in a research program of experimental data on thermodynamic and transport properties of binary mixtures [1][2][3][4][5] in lately suggested correlation equations.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach of Partial Derivatives to Estimate the Normal Boiling Temperature via Viscosity Arrhenius Behaviour in N,N-Dimethylformamide + Ethanol Fluid Systems

Dallel¹,

Al-Arfaj²,

Alomair³

et al. 2017

Asian J. Chem.

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The experimental values of absolute viscosity in N,N-dimethylformamide + ethanol binary fluid mixtures (from 303.15 to 323.15 K) can induce us to investigate different correlation expressions as well as their derivative quantities. Investigation of the molar enthalpy of viscous flow (∆H*) and the viscosity activation energy (Ea) reveals close values and similar variation against composition, here we can justify the notion of partial activation energies Ea1 and Ea2 for pure components along with their separately individual contributions. Correlation between the two Arrhenius parameters in the whole range of compositions shows the existence of different interaction behaviours, delimited by peculiar compositions. It is also noticed that the ratio between the two parameters leads to the Arrhenius temperature which is in causal correlation with the temperature of vapourization in the liquid-vapour isobaric diagram and the limiting partial properties can permit us to predict values of the boiling temperatures of the pure fluid components.

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“…Un número significativo de estudios se han realizado para medir las viscosidades de una gran variedad de mezclas líquidas; no obstante existe la necesidad de continuar ampliando el banco de datos termodinámicos en este tipo de sistemas en un amplio intervalo de composición y temperatura (Yang et al,2008;Páez et al,2011;Bhuiyan et al,2008).…”

Section: Introductionunclassified

“…La DMF se caracteriza por poseer un momento dipolar grande ( μ = 3,24 Debye) y una constante del dieléctrica alta (ε = 36,71) que le confieren la capacidad de ser un excelente solvente para la síntesis de polímeros y productos farmacéuticos (Bhuiyan et al,2008). Además puede utilizarse como disolvente para sales o compuestos con un peso molecular elevado, debido a la habilidad que posee para formar complejos.…”

Section: Introductionunclassified

Viscosidades de la mezcla n,n-Dimetilformamida + I-Butanol a Diferentes Temperaturas

Páez¹,

Cantero²,

Peña³

2012

Inf. tecnol.

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ResumenSe determinaron los tiempos de flujo de la mezcla binaria usando un viscosímetro Anton Paar modelo AMVn. La mezcla estudiada fue n,n-dimetilformamida+1-butanol sobre todo el intervalo de fracciones molares a las siete temperaturas, desde 283.15 a 313.15 K. A partir de los datos obtenidos se calcularon las viscosidades absolutas, las desviaciones de viscosidad, los coeficientes de la ecuación de Redlich-Kister, los parámetros de activación del flujo viscoso y las propiedades termodinámicas de exceso. Los resultados se interpretaron en términos de las interacciones presentes en la solución. El sistema mostró desviaciones negativas de viscosidad, lo cual podría indicar disrupción de los enlaces de hidrógeno presentes en el alcohol y presencia de débiles interacciones físicas entre las moléculas distintas en la mezcla. Esto está de acuerdo con los valores obtenidos para los parámetros de activación de exceso del flujo viscoso. Palabras clave: viscosidad, parámetros de activación, flujo viscoso, propiedades de exceso Viscosities of the Mixture n,n-Dimethylformamide + 1-Butanol at Different Temperatures AbstractFlowing times of a binary mixture were determined using an AMVn Anton Paar viscometer. The mixture studied was n,n-Dimetilformamida + 1-butanol over the entire range of mole fractions at seven temperatures, from 283.15 to 313.15 K. From the data obtained, the absolute viscosity, viscosity deviations, coefficients of the Redlich-Kister equation, activation parameters of viscous flow and excess thermodynamic properties were calculated. The results were interpreted in terms of the interactions present in the solution. The system showed negative deviations for the viscosity, which could mean disruption of hydrogen bonds present in the alcohol and the presence of weak physical interactions between unlike molecules in the mixture. This is in agreement with the values obtained for the excess activation parameters of viscous flow.

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Excess molar volumes and excess viscosities for mixtures of N,N-dimethylformamide with methanol, ethanol and 2-propanol at different temperatures

Cited by 85 publications

References 49 publications

Thermodynamic and Acoustic Study on Molecular Interactions in Certain Binary Liquid Systems Involving Ethyl Benzoate

Thermodynamic and Acoustic Study on Molecular Interactions in Certain Binary Liquid Systems Involving Ethyl Benzoate

A Novel Approach of Partial Derivatives to Estimate the Normal Boiling Temperature via Viscosity Arrhenius Behaviour in N,N-Dimethylformamide + Ethanol Fluid Systems

Viscosidades de la mezcla n,n-Dimetilformamida + I-Butanol a Diferentes Temperaturas

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