Effects of potassium hydroxide and aluminum oxide on the performance of a modified solvay process for <scp> CO ₂ </scp> capture: A comparative study

In a previous work, the overall performance of modified Solvay process was investigated in absence ammonia, where carbon dioxide and brine treatments were accomplished single reaction presence calcium hydroxide (Ca(OH)2). this study, impact alkaline amphoteric oxides, namely potassium (KOH) aluminum oxide (Al2O3), on pH level, CO2 capture capacity, ions reduction, type produced solids at temperature 20°C gas flow rate 1 L/min. At stoichiometric ratio less than solubility limit, KOH/brine mixture achieved uptake 0.31 g CO2/g KOH. comparison, about 0.92 captured by CaO when added to an amount that more limit but ratio. Moreover, percentage reduction for KOH almost same except sulfate ions, as best removal CaO. The poorest occurred with Al2O3. X-ray diffraction used identify most solid products, obtained results proved is promising combined process. addition, chloride crystals utilized, which very valuable product, it can also be easily separated. Although Al2O3 showed no reactivity, revealed good terms magnesium recovery could considered coagulant recovering reject solution.