New Amine Based Solvents for Acid Gas Removal

Treatment and separation of multicomponent gases using absorption/desorption cycles in aqueous solutions is a very well-known and efficient method, used for natural gas and biogas purification or greenhouse gas mitigation. More specifi cally, aqueous solutions of amine are used with efficiency for CO₂ removal from gas mixtures. However, the large energetic cost involved with carbon capture processes is a critical downside. To address this issue, a new class of amine is considered to decrease the cost of the regeneration: The demixing amines. These amines pres ent a lower critical solution temperature that can be used with benefit in post combustion processes. Precedent studies conducted on methylpiperidines in water have shown the difficulty of obtaining "ideal" absorbent systems. The aim of this chapter is to evaluate the influence of a physical absorbent, namely triethylene glycol, on the thermodynamic properties (such as liquid-liquid equilibria, vapor-liquid equilibria, heat capacities, densities and heat of solutions) of aqueous solu tions of demixing amine in order to design new operation units for carbon capture process.