Modeling Hydrogen Sulfide Removal Using Sodium Carbonate in Rotating Packed Beds: A Contribution Ratio Analysis

Abstract

Cost-efficiency removal of hydrogen sulfide from effluent gases is a research topic of immense importance, for which rotating packed beds (RPBs) with small volumes and high efficiencies have attracted much attention. To reveal the complex interactions between hydrogen sulfide and sodium carbonate under the role of rotating packing in RPB, a mathematical model was developed. It contained correlations of mass-transfer rates (gas to liquid phase and in the liquid phase interior), chemical reactions between hydrogen sulfide and sodium carbonate, gas–liquid effective interfacial area, and liquid holdup. Experimental data and model predications were compared. The operating conditions, such as high gravity factor, liquid flow rate, gas flow rate, sodium carbonate concentration and hydrogen sulfide inlet concentration, were optimized by the model. Contribution ratios of gas and liquid mass transfer rates, gas–liquid effective interfacial area, and liquid holdup on the removal efficiency at different high gravity factors, liquid flow rates, and gas flow rates were analyzed in an RPB, and compared with a packed bed. The model enabled better understanding of RPBs and determined optimum operating conditions.