The densities of the binary mixtures of CO_2-methanol,CO_2-ethanol, CO_2-n-butyraldehyde,CO_2-i-butyraldehyde were measured at temperature ranging from 313.5 K to 323.5 K under a pressure ranging from 7 MPa to 14 MPa.The partial molar volumes of the solutes were calculated based on the relationship between the concentrations of the solutes and the densities of the mixtures.Intermolecular interaction between CO_2 and the solutes was studied based on the partial molar volume data.The partial molar volumes of ...