Solubility of carbon dioxide in aqueous solution of 2-amino-2- hydroxymethyl-1, 3-propanediol at elevated pressures

The removal of acid gases such as carbon dioxide (CO2) from various industrial streams is a significant step in gas processing industry. The removal of CO2 by alkanolamines absorption process is the most frequently used process around the globe. The conventional amines such as DEA and MDEA suffer with low CO2 loading capacity and high heat of regeneration. Recently, sterically hindered amines are proposed as potential solvents for acid gas removal due to their unique cyclic structure, high CO 2 loadings and low heat of regeneration. The investigated solvent in this paper, 2-Amino-2- hydroxymethyl-1,3-propoanediol (AHPD) is a sterically hindered amine. The kinetic studies show that AHPD is a good potential solvent for CO2 removal from various industrial streams. The knowledge of equilibrium solubility data of such solvents is important to design acid gas removal system. The objective is to provide the CO2 solubility data in aqueous solutions of AHPD at high pressures which can be helpful in designing of high pressure absorption systems. Therefore the solubility of CO2 in aqueous solutions of AHPD is experimentally measured from 5 to 60 bar at three industrially important temperatures i.e. 303.15, 313.15 and 333.15 K. The effect of pressure is found to be positive on solubility as CO2 loadings are higher at elevated pressures. The solubility data is also represented using Kent-Eisenberg model and a good agreement is found between model predicted values and experimental results.