Gas-liquid mass transfer of carbon dioxide capture by magnesium hydroxide slurry in a bubble column reactor

Abstract

Magnesium hydroxide (Mg(OH)₂) has been considered as a potential solvent for C0₂ removal of coal-fired power plant and biomass gas. The chemistry action and mass to transfer mechanism of C0₂-H₂0-Mg(OH)₂ system in a slurry bubble column reactor was described, and a reliable computational model was developed. The overall mass transfer coëfficiënt and surface area per unit volume were obtained using experimental approach and simulation with software assistance. The results show that the mass transfer process of C0₂ absorbed by Mg(OH)₂ slurry is mainly liquid-controlled, and slurry concentration and temperature are main contributory factors of volumetric mass transfer coëfficiënt and liquid side mass transfer coefficient. High concentration of C0₂ has an adverse effect on its absorption because it leads to the fast deposition of MgC0₃-3H₂0 crystals on the surfaces of unreacted Mg(OH)₂ particles, reducing the utilization ratio of magnesium hydroxide. Meanwhile, high CO₃² ion concentration limits the dissolution of MgC0₃ to absorb C0₂ continually. Concentration of 0.05 mol/L Mg(OH)₂, 15% vol C0₂ gas and operation temperature at 35 °C are recommended for this C0₂ capture system

Keywords

mass transfer / CO₂ capture / magnesium hydroxide / bubble column

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