Measurement of CO2 Solubility in Tributyl Phosphate
CO2在磷酸三丁酯中溶解度的测定

The solubility of CO2 in tributyl phosphate (TBP) solvent was measured in a temperature range of 303.15～363.15 K and gas pressure of CO2 up to 4.5 MPa by the constant volume method. The results showed that the solubility increased with the augment of CO2 gas pressure and decreased with the rising of equilibrium temperature. GC/MS and FT-IR analysis results indicated that the capture process of CO2 by TBP could be regarded as physical absorption. The Henry’s coefficient which was obtained by fitting of the experimental data was well consistent with the Henry’s law. It confirmed that there was no chemical change during the adsorption process. Comparing the absorption capacity of TBP with other solvents, the CO2 solubility in TBP was 1.4 times higher than that in ethanol and 0.2 times higher than that in N-methyl-2-pyrrolidone under the same conditions.