Densities and derived thermodynamic properties study for the binary mixtures of (Ethyl methyl ketone, N,N-Dimethylbenzylamine) at different temperature

Abstract: In this study, the density and refractive index of binary system including ethylmethylketone, N, N-dimethylbenzylamine in T= (298.15 – 318.15) K was investigated. Using these values, the thermodynamic properties such as excess molar volume,VmE, partial expansion molecular volume, V ̅_(m,i)^Eexcess expansion coefficient, αE, isothermal coefficient of pressure excess molar enthalpy, (∂HEm /∂P)x.T and refractive index deviation, ∆nD ,are also calculated. The excess molar volume and refractive index deviation of the binary mixtures were correlated with the Redilich-Kister equation. The excess molar volume of all three system, { N, N-dimethylbenzylamine, and ethylmethylketone } have a negative deviation of the ideal state. This trend for the refractive index deviation of the two system, N, N-dimethylbenzylamine and ethylmethylketone , is negative and deviates with increasing temperature. Refractive index deviation for at a temperature of 298.15 K has a negative value for the low mole fraction of and has positive values for high mole fraction of Solvent, but with increasing the temperature, these values in all of the molar fractions finds a positive deviation. The comparison of refractive index deviation of these three systems suggests that the deviation from the ideal state of the ethylmethylketone + N, N-dimethylbenzylamine system has more deviation from ideal state. Also, four experimental quantitative equations were used to calculate the deviation of the refractive index of binary systems using the refractive index of pure compounds.In the second part, the density, ρ, refractive index, nD