A mathematical model for gas absorption membrane contactors that studies the effect of partially wetted membranes

Pushing the limits of intensified CO2 post-combustion capture by gas–liquid absorption through a membrane contactor

“…profiles and is interesting in order to fit specific parameters such as k m , for a set of operating conditions [42]. Alternatively, 1D resistance in series approach, making use of correlations for local resistance computations, is also proposed in a large number of cases [33,[36][37][38].…”

“…The liquid mass transfer coefficient primarily depends on liquid velocity (and viscosity), while the membrane mass transfer coefficient k M , which is most often experimentally determined, shows a broad variation range depending on the membrane characteristics and wetting conditions. It should be noted that even a limited wetting of the membrane material (such as a few percent) induces a one to two orders of magnitude decrease of the membrane mass transfer coefficient [13,38,39]   It can be noticed that the increase of the MEA mass fraction in the liquid phase and temperature of the absorption unit, the two variables investigated in this study, favorably impact the enhancement factor, through Ha andE∞. Nevertheless, increasing MEA concentration increases the liquid viscosity which reducesk l value.…”

“…Three mass transfer domains are considered: the gas phase, the membrane and the liquid phase(Figure 7). The CO 2 diffuses first in the gas phase through the gas-membrane interface, then in the membrane through the membrane liquid interface and finally it dissolves in the liquid phase before reacting with MEA.A very large number of studies have been reported on the modelling strategy of membrane contactors for CO 2 capture[33][34][35][36][37][38][39][40][41][42]. Basically, two main categories of approaches have been proposed.…”

Membrane gas–solvent contactor trials of CO2 absorption from syngas

“…The Reynolds number is based on the randomly packed definition [32,33]. For gas-filled pores, the membrane pore resistance is the inverse of the mass transfer coefficient, given by [20]:…”

“…The most common membrane materials are polypropylene (PP), polyethylene (PE) and polytetrafluoroethylene (PTFE) while water, amines such as monoethanolamine, amino acid salts and NaOH have all been tested as solvents [8][9][10][11][12][13][14][15][16][17][18][19]. Many of these studies have shown that the potential for membrane gas contactors is limited by the wetting of the membrane pores, which reduces the overall mass transfer coefficient [8,20,21].…”