In-Line Monitoring of Carbon Dioxide Capture with Sodium Hydroxide in a Customized 3D-Printed Reactor without Forced Mixing

Many industrial processes make use of sodium because is the fifth most abundant metal and seventh element on Earth. Consequently, there are many sodium-containing wastes that could potentially be used for carbon capture, paving way towards a circular biobased economy. For example, common chemical NaOH, which found in black liquor, by-product paper pulp industry. Nonetheless, literature available CO2 absorption capacity aqueous NaOH scarce making fair comparison with waste. Therefore, to fill this gap set foundation future research solutions concentration range 1–8 w/w% was evaluated, wider compared currently data. The data presented here enables evaluating performance sodium-based wastes, complex mixtures might contain other compounds enhance or worsen their capture capacity. We designed customized reactor using 3D-printer facilitate in-line measurements proper mixing between phases without energy stirring. confirmed by computational fluid dynamics simulations. measured via weight analysis progress carbonation pH meter an FTIR probe in-line. At 5 higher, reaction resulted precipitation. solids were analyzed X-ray diffraction scanning electron microscope, nahcolite natrite identified. With our setup, we achieved capacities 9.5 78.9 g CO2/L 1 8 respectively. results agreement previously reported literature, suggesting non-forced reactors function need stirring equipment possible lower consumption.