Optimization of Carbon Dioxide Capture Process Parameters in Sodium Metaborate Solution

In this study, parameters affecting the carbonation reaction of carbon dioxide with sodium metaborate solutions were determined and optimized for a variety of process conditions. These parameters include reaction temperature, sodium metaborate concentration, carbon dioxide flow rate, and sodium metaborate/sodium hydroxide molar ratio. Two experimental designs were created for the carbonation reaction with different parametric ranges based on the solubility of the reactants. One of the designs contains high solubility of carbon dioxide and the other has high solubility of sodium metaborate.  The modeling results exhibit a good agreement with the experimental values for the low-temperature design. The modeled conditions exhibit an optimal reaction temperature of 24.0±1.0 oC, a carbon dioxide flow rate of 300±10 mL/min, and a molar ratio of 1.23±0.03 mol NaBO2/mol NaOH. The design conditions show that the rate of carbon dioxide consumption is 0.80 mol CO2/min at optimum, which is coherent with the experimental mean value of 0.77 mol CO2/min.