Solubility of CO2 in aqueous amine solutions: a study to select solvents for carbon capture from natural-gas power plant

摘要

New solvents or solvent formulations are required for the capture of CO2 from natural gas power plants, the flue gases from which typically contain low concentrations of CO2 coupled with relatively high concentrations of O2. Information concerning vapour-liquid equilibrium, in particular CO2 loading capacity, is important for the selection of solvents to be employed for absorption. A static-analytic apparatus has been developed to acquire such data at temperatures between (313 and 393) K and various CO2 partial pressures. A tertiary amine, 2-dimethylaminoethanol (DMAE) and its blended solutions with piperazine (PZ) were studied. The density and viscosity of these amine solutions were also measured to yield a better understanding of their performance in mass transfer and fluid dynamics.