Partial molar and excess volumes and adiabatic compressibilities of binary mixtures of ethanolamines with water

Speed of sound and densities of solutions of mixtures of seven ethanolamines with water were measured over the full range of composition at 25, 35, and 45 degrees C. Results of these measurements were used to calculate adiabatic compressibilities, excess volumes, partial molar and apparent molar volumes, and apparent molar compressibilities. Knowledge of the above properties of these mixtures are a basis for understanding some of the molecular interactions in these systems. From the analysis of the results, the type of interactions between the ethanolamines and water are discussed in terms of the number and size of the alkyl groups attached to the nitrogen atom of ethanolamine.