Membranecontactors have been proposed as an advanced tool for CO2capture from flue gases by absorption in alkaline solutions. However,regeneration of the alkaline reagent and further CO2sequestrationare pending issues. In this paper, membrane-assisted crystallizationis proposed for crystallizing Na2CO3, whichallows its reuse, after CO2absorption from flue gases.Due to the presence of compounds other than CO2in fluegases (i.e., SO2, NOx), othercompounds (Na2SO4and NaNO3) mayinterfere with Na2CO3crystallization. Thiswas evaluated by measuring the flux through the membrane and the morphology,crystallography, and purity of the crystals. Furthermore, the presenceof NaCl possibly transferred from the osmotic solution to the feedsolution was evaluated. The experimental results indicate that thepresence of impurities decreases the flux through the membrane dueto the decrease of water activity, although there is no influenceon the overall mass transfer coefficient. The presence of Na2SO4affected the morphology of the Na2CO3crystals while NaNO3and NaCl had no apparenteffect on the crystalline products. It was confirmed that Na2CO3·10H2O was formed during the crystallization.Moreover, the purity of Na2CO3crystals reachesup to ca. 99.5%. Membrane-assisted crystallization was concluded tobe feasible in recovering CO2as a carbonate salt, whichcan possibly be reused in the industry. [ABSTRACT FROM AUTHOR]