Enhancements in mass transfer for carbon capture solvents part II: Micron-sized solid particles. (June 2017)

• Record Type: Journal Article
• Authors: Mannel, David S.; Qi, Guojie; Widger, Leland R.; Bryant, Jonathan; Liu, Kun; Fegenbush, Aaron; Lippert, Cameron A.; Liu, Kunlei
• Is Part Of: International journal of greenhouse gas control. Volume 61(2017)
• Page Start: 138
• Page End: 145
• Publication Date: 2017-06
• Subjects: Post-combustion -- CO2 capture -- Mass transfer -- Amine -- Particle -- Additives; Greenhouse gases -- Environmental aspects -- Periodicals; Air -- Purification -- Technological innovations -- Periodicals; Gaz à effet de serre -- Périodiques; Gaz à effet de serre -- Réduction -- Périodiques; Air -- Purification -- Technological innovations; Greenhouse gases -- Environmental aspects; Periodicals; 363.73874605
• DOI: 10.1016/j.ijggc.2017.03.027
• Languages: English
• ISSNs: 1750-5836

Abstract

Highlights: Addition of small-scale solid particles to amine-based carbon capture solvents promotes mass transfer of CO2 into several common CCS solvents. Hydrophobic particles exhibit greater enhancement than hydrophilic particles. Particle additives exhibit greater enhancement in kinetically fast, diffusion-limited, solvents. In a heat integrated process, particle additives lower overall energy penalty by increasing rich carbon loading and stripping mass transfer rate. Abstract: The mass transfer of CO2 into amine-based carbon capture solvents was improved with the addition of heterogeneous micron- and nano-sized particle additives. Enhancement in CO2 removal rate was determined in a stirred reactor with a flat steady gas-liquid interface and in a small packed-bed absorption column. The screening of several particle types in the stirred reactor indicated that carbon particles are best suited to enhance the rate of CO2 diffusion in 30 wt.% monoethanolamine (MEA), and tests in the small packed-bed absorption column showed improved CO2 mass transfer in three solvents, MEA, piperazine (PZ), and hexanediamine (HDA), upon addition of nano-sized activated carbon particles. The enhancement of CO2 capture efficiency and KG increases with increasing solvent kinetics, in order of methyldiethanolamine (MDEA) < MEA < PZ < HDA, confirming the particle additives have a larger impact on kinetically faster, liquid-side diffusion limited, solvents. The combined benefits of the particle additives were then demonstrated on an absorption-desorption integrated bench-scale CO2 capture unit, in both MEA and the thermally stable advanced amine blend: 1-amino-2-propanol (A2P)/2-amino-2-methyl-1-propanol (AMP). The combined system translated to an overall 26% reduction in energy penalty for CO2 capture on the CAER Bench-scale unit.