The Experimental Study of Co2, Ch4 and Their Mixture Solubility in Aqueous Solution of Amin + Ionic Liquids (Gas Sweeting)

Carbon dioxide has been identified as the main factor responsible for global warming. currently, the process applied for co2 capture at a large scale is the amine-based solvent absorption process. amines, considered as conventional solvents, are being used for gas sweetening process. the main disadvantages of these conventional amines are solvent degradation, high volatility, corrosion and high energy cost of their regeneration causing low solvent recovery and high energy consumption in the regeneration process because of the large enthalpy of formation produced in reactions with co2. ionic liquids, known as “green solvents”, are considerably given attention as promising alternatives for amines to remove acid gases in gas sweetening process. ionic liquids have several remarkable advantages such as low vapor pressure, low cost of regeneration, nonflammability, high thermal and chemical stability. the main aim of this thesis was to experimental investigation on the solubility and absorption of co2 and ch4 in aqueous mixtures of methyldiethanolamine (mdea) with the ionic liquid 1-butyl-3-methylimidazolium acetate ([bmim][ac]. the solubility of co2, ch4, and co2/ch4 mixtures (25/75 mol%, 50/50 mol% and 75/25 mol%) in aqueous mixtures of ionic liquids [bmim][ac], and mdea are measured at 308.15 k for pressures up to 50 bar.