Methods to Calculate the Solubility of the Acid Gas in TEG

During the dehydration process, the hydrogen sulfide and carbon dioxide will be dissolved in TEG, leading to increase the corrosion rate of the TEG dehydration and regeneration system, while increasing the rate of deterioration of the TEG.In the paper, three methods are introduced to calculate the solubility of the acid gas in TEG.E.WICHERT and GC WICHERT's charts is suit for 25≤T≤75℃, 100 < P < 3000kPa (H₂S) and 100kPa≤P≤6000kPa (CO₂).Alireza Bahadori and Khalil Zeidani introduced new equations used to calculate the solubility of acid gas in TEG.For the calculation of the concentration of hydrogen sulfide, the equation is fit for 50kPa < P < 2000kPa (abs), T < 130℃, for carbon dioxide, different temperature and pressure use different equations.Through compared with the experimental data, the average absolute deviation of H₂S and CO₂ solubility is 3.0296% and 1.9394% respectively.Finally, the solubility of the acid gas in TEG is calculated by HYSYS.