The Experimental Study of CO۲, CH۴ 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 CO۲ 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 maindisadvantages of these conventional amines are solvent degradation, high volatility, corrosion and highenergy cost of their regeneration causing low solvent recovery and high energy consumption in theregeneration process because of the large enthalpy of formation produced in reactions with CO۲. Ionicliquids, known as “green solvents”, are considerably given attention as promising alternatives foramines to remove acid gases in gas sweetening process. Ionic liquids have several remarkableadvantages such as low vapor pressure, low cost of regeneration, nonflammability, high thermal andchemical stability. The main aim of this thesis was to experimental investigation on the Solubility andAbsorption of CO۲ and CH۴ in Aqueous Mixtures of Methyldiethanolamine (MDEA) with the IonicLiquid ۱-butyl-۳-methylimidazolium acetate ([Bmim][Ac]. The solubility of CO۲, CH۴, and CO۲/CH۴mixtures (۲۵/۷۵ mol%, ۵۰/۵۰ mol% and ۷۵/۲۵ mol%) in Aqueous Mixtures of ionic liquids [Bmim][Ac],and MDEA are measured at ۳۰۸.۱۵ K for pressures up to ۵۰ bar.

Keywords:

amine-based , gas sweetening , Methyldiethanolamine (MDEA) , Ionic Liquid