Density, excess molar volume and some of their derived properties of the binary systems of methyl acetate with methyl derivatives of monoethanolamine between 293.15 and 313.15 K

Densities at five temperatures in the range 293.15–313.15 K were reported for the systems of methyl acetate + N-methylethanolamine and + N, N-dimethylethanolamine. Excess molar volumes, apparent molar volumes, partial molar volumes and partial volumes at infinite dilution were calculated from the measured density data. Excess molar volumes were calculated from the measurement results and correlated as a function of composition using the Redlich–Kister relation. The densities plotted with respect to mole fraction of alkanolamine were found to be formed maxima at equimolar position for methyl acetate + N-methylethanolamine and were observed linear decrement of density with increasing concentration of alkanolamine for methyl acetate + N, N-dimethylethanolamine system. The excess molar volume represented as a function of mole fraction of alkanolamines showed different behavior for methyl acetate + N-methylethanolamine and methyl acetate + N, N-dimethylethanolamine. The excess molar volumes changed sign from large positive over a wide range of composition to very small negative within a short compositional range for methyl acetate + N, N-dimethylethanolamine system. In contrary, the methyl acetate + N-methylethanolamine system at all temperatures showed the complete negative excess molar volumes over the entire range of composition with minima at equimolar position.