The thermodynamics of (carbon dioxide + methanol) mixtures from 25 degrees C to 250 degrees C and at pressures up to 20 MPa.

摘要

The presence of carbon dioxide in natural gas, synthetic gas and liquid streams has prompted the industrial community to examine the properties of carbon dioxide mixtures with the intent of finding novel methods for removing this acidic impurity. Carbon dioxide is also of interest to researchers because it possesses a readily accessible critical point. The (CO2 + MeOH) system is of interest to applied research on fluid properties because the pure liquids have widely differing critical points.There are many experimental issues associated with supercritical fluids, and laboratory equipment must be specially designed to handle these high pressure, high temperature fluids. A high precision isothermal microcalorimeter has been commissioned to measure the excess molar enthalpy of mixing HEm for the mixture at 298.15 K and pressures of 7.5 and 10.0 MPa. A platinum vibrating U-tube densitometer with a specially designed injection system has been used to measure the densities of (CO2 + MeOH) mixtures at temperatures from 298.15 K to 523.15 K and pressures up to 20.0 MPa, from which excess molar volumes VEm were calculated. (Abstract shortened by UMI.)