To screen amine solvents for application in CO2 capture from
coal-fired power plants, the equilibrium CO2 partial pressure and
liquid film mass transfer coefficient were characterized for
CO2-loaded and highly concentrated aqueous amines at 40 - 100 C
over a range of CO2 loading. Promising solvents with large CO2
capacity, fast mass transfer rate and moderately high heat of
absorption were identified. A rigorous thermodynamic model was
developed for a selected amine solvent in the framework of the
Electrolyte Nonrandom Two-Liquid model using the
vapor-liquid-equilibrium and liquid speciation data. The lab-scale
mass transfer rate data was represented with a rate-based model
created in Aspen Plus(r), in which the reaction rate was described
with activity-based termolecular mechanism. The rate-based model
can be used for design and simulation of large-scale CO2 capture
proces
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