Mass transfer coefficients for CO2 absorption by aqueous 4 M, 5 M, and 6 M morpholine (MOR) solution at 30 C under carbon loaded conditions are presented. Measurements were performed using a wetted wall column under simulated flue gas conditions for postcoal combustion CO2 capture. Similar to other major amines, it was found that the amine concentration has a positive impact on the overall mass transfer coefficient at lean loading while at rich loading the difference between each concentration is within experimental uncertainty. It was also observed that the viscosity increases more dramatically with amine concentration in MOR than monoethanolamine (MEA) within the studied carbon loading range due to different hydrogen-bond structures. The calculation of physical mass transfer resistance in the liquid film revealed that the reaction resistance dominates at lean loadings while the physical mass transfer takes a large portion at the rich loadings. The rate constant of the pseudo-first-order reaction of MOR and CO2 was calculated to be three times higher than MEA, which is consistent with the experimental mass transfer data from the wetted wall column experiment.
|Number of pages||7|
|Journal||Industrial and Engineering Chemistry Research|
|State||Published - Nov 13 2013|
ASJC Scopus subject areas
- Chemistry (all)
- Chemical Engineering (all)
- Industrial and Manufacturing Engineering