Solubility of H2S in a new absorbent, propylene carbonate (WP) modified by triethanoloamine (TEA), was determined by a static method [1]. The measurements were carried out in the temperature range of 10-40 degrees C at partial pressure of gases up to 1.1 bar and TEA concentration range of 0-10% wt. The results are shown in Figs 1-4 in the form of diagrams of solubility cr vs. partial pressure p. The functions p(H2S)* = f(alpha) are linear for pure WP like for physical absorption, while for WP/TEA mixtures they show deviations from the Henry＇s law. Addition of TEA to WP increases significantly the solubility of H2S (Table 4). The solubility of H2S in WP has been correlated with temperature and H2S partial pressure (Eq. (1)); the solubility of H2S in WP/TEA has been correlated with temperature, H2S partial pressure and TEA concentration (Eq. (2)). On the basis of the regular solutions theory for mixed solvents and the Hildebrand-Scatchard equations ((3)-(5)), the solubility parameter delta(TEA) was determined. This parameter changes significantly both with temperature and TEA concentration. The H2S-WP/TEA system cannot be regarded as a regular one. Measurements of simultaneous solubility of CO2 and H2S in WP with addition of 10% wt. of TEA have been carried out at 20 degrees C. The results are shown in Table 8. CO2 and H2S dissolve in WP/TEA mixtures independently. Addition of TEA to WP increases solubility of H2S to a higher degree than that of CO2, especially at low temperatures (Figs. 5, 6), which enables one to increase selectivity of absorption of H2S removed from the gas containing also CO2.