The concentrations of triethylene glycol (TEG), diethylene glycol (DEG) and ethylene glycol (EG) in supercritical carbon dioxide (CO2) up to 16 MPa at 313. 15, and 333. 15K were measured by a vapor recirculation method. The concentrations of these glycols increase with increasing pressure and markedly increase from about 8 MPa at 313. 15 K and from about 11 MPa at 333. 15 K. A plot of the concentration of TEG, DEG and EG vs the density of pure CO2 shows a gradually increasing curve. Also the concentrations were in the order of the vapor pressures of the glycols. The data were correlated using the following three methods: 1) Modified Redlich-Kwong (MRK) equation, 2) Peng-Robinson (PR) equation, 3) virial equation. From the results, it was found that the MRK equation gave a better fits than 2) or 3). However the correlation by the modified Peng-Robinson (MPR) equation proposed by Mohamed et al. gave almost the same results as the MRK equation.
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