Apparent molar heat capacitites of aqueous solutions of CH4, CO2, H2S, and NH3at temperatures from 304 K to 704 K at a pressure of 28 MPa

Abstract

Heat capacities of dilute aqueous solutions of methane, carbon dioxide, hydrogen sulfide and ammonia were measured at temperatures ranging from 300 K to 705 K and at pressure 28 MPa. The thermodynamic behaviour of aqueous non-electrolytes in the supercritical region is discussed. The results show the expected very large maximum and minimum near the critical density of water. Methods of correlating and predicting values ofVm.2andCp.m.2are explored.