Research on Deoxygenation Behavior of Sulfite Deoxygenation Resin

The deoxygenation performance of sulfite deoxygenation resin is closely related to its structure and adsorption kinetics thermodynamics. The study of deoxygenation mechanism can provide theoretical guidance for the subsequent optimization of resin. The microstructure of deoxygenation resin was characterized by infrared spectroscopy, scanning electron microscope and dispersion spectrum analysis, and the deoxygenation kinetics and thermodynamics of sulfite deoxygenation resin were studied. The microscopic characterization shows that the deoxygenation resin is a polystyrene sulfurous acid resin with carbon chain as the skeleton. The adsorption kinetic process of deoxygenation resin on the dissolved oxygen in aqeous solution conforms to the pseudo-second-order kinetic model, and there is chemical adsorption in the adsorption process of dissolved oxgen in water. The diffusion mass transfer model fitting showed that the main control step of the high-temperature deoxygenation resin was chemical reaction, and the main control step of sulfite deoxygenation resin transformed from anionic resin was liquid film diffusion. Gibbs free energy change (ΔG)<0, enthalpy change (ΔH)>0 and entropy change (ΔS)>0 of the deoxygenation resin indicate that its adsorption is a reversible spontaneous endothermic reaction, and increasing the temperature is beneficial to the adsorption. The research results in this paper can provide guidance for the performance optimization of deoxygenation resin.