CO2 Removal from Gas Mixtures by Aqueous Solutions of MEA and (MEA+AEEA) and Results Comparing Using the Modified Kent-Eisenberg Model

Considering the growing importance of alkanolamine aqueous solvents in gas refineries or other powerhouses, it is essential to achieve the appropriate solution for CO2 absorption. This requires to produce systematic vapor-liquid equilibrium data in a wide range of temperature, CO2 partial pressure and different alkanolamines concentration. In this research with the application of equilibrium pilot plant in local atmospheric pressure, CO2 solubility data have been reported in MEA solvent and its blend with AEEA in temperatures (303, 313 and 323) K, CO2 partial pressures of (8.44, 25.33 and 42.22) kPa, concentrations of 12 wt% for MEA and (12+1, 12+2 and12+3) wt% for (MEA+AEEA). The measured solubility was then predicted by the theoretical model of modified Kent Eisenberg. The constant parameters of the apparent equilibrium for the porotonation and carbamate reaction in the Modified Kent Eisenberg model were optimized with the MATLAB software. It was conclude that CO2 solubility values in all the studied experiments increased with increasing CO2 partial pressure while increasing temperature and solvent concentration decreased the solubility. The comparison between the CO2 absorption into the MEA solvent alone and AEEA activated MEA shows that (MEA+AEEA) blend in compare to the single MEA has a higher CO2 loading. Also %AAD values for the solubility of MEA and (MEA+AEEA) were found to be 3 and 17.28 respectively.

Keywords:

CO2 soulubility , MEA , AEEA , Modified kent- Eisenberg mode , correlation