Real Acid Natural Gas Solubility Measurement in Novel Hybrid Solvents of Amine and Ionic Liquids

This study aims to investigate the performance of various hybrid solvents of amine and ionic liquids in the acid gas sweetening process. Two ionic liquids including [Hmim][NO۳] and [Bmim][Ac] were used with MDEA amine solvent to investigate the solubility of H۲S, CO۲, and various hydrocarbons from a real natural gas. The solubility data were measured at a pressure range of ۲~۴۴ bar, temperature range of ۲۹۸.۱۵, to ۳۳۸.۱۵K, and ILs loading of ۱۰~۲۰(wt.%) in the hybrid solvents. The experimental design was employed to obtain the optimum condition of hybrid solvents. The results show that increasing ILs loading up to ۱۰% in the hybrid solvent increased the CO۲ solubility for both ILs up to ۸.۶%, and reduced the H۲S solubility by up to ۶% at the highest pressure and lowest temperature tested. The effect of pressure is the dominating factor on the solubility of the acid gases while the temperature and ILs loading percentage play a major role on the solubility of acid gases. In addition, the hybrid solvent containing ۱۰ (wt.%) of [Bmim][Ac] showed better solubility towards CO۲ in comparison to the solvents containing [Hmim][NO۳]. It was concluded that this hybrid solvent is more suitable for CO۲ absorption from natural gases containing higher CO۲ and lower H۲S concentration.

کلیدواژه ها:

Solubility ، Hybrid solvent ، Ionic liquids ، amine solvent ، Natural gas