The Inhibited Mechanism Of Sulfite In The Oxidation Reaction

The emission of SO2 from the industrial boilers is difficult to deal with, and also a focus in the “twelfth five-year” period. Because of high desulfurization efficiency, simple process, not easy to scale and stable running. Magnesium oxide and sodium method desulphurization process has obvious advantage in industrial boiler flue gas. However, the technical barriers controlling sulfite oxidation retards the recycling utilization of by-products and the development of this technology. The Inhibitor added to the system has become an effective means to solve the problem of by-product recovery. It is a hot issue to develop a high efficiency and low residual sulfite oxidation inhibitor in this field.In this paper, the high purity of magnesium sulfite was made by the vacuum rotary evaporation. The four inhibitors including methanol, ethanol, sodium thiosulfate and hydroquinone were selected and compared in the bubbling apparatus. The results showed that the hydroquinone could retard the oxidation rate of sodium sulfite and magnesium sulfite obviously.The kinetics of sodium sulfite and magnesium sulfite under the conditions simulating the practical working was studied. The apparent activation energy general and reaction orders with respect to the inhibitors, magnesium sulfite, sodium sulfite and oxygen were achieved. Integrated with the mathematical model of three-phase reaction process, the kinetic mechanism in presence of the supported hydroquinone was controlled by the intrinsic reaction kinetics and the expression of R was achieved.Through studying the kinetics of magnesium sulfite and sodium sulfite, the theory basis about sulfite oxidation controlled was investigated. The results in this paper provide a new scientific basis and open a new route for the by-product recovery, which has an important theoretical significance and application value.