Low Concentrations Of H <sub> 2 </ Sub> S Liquid Phase Catalytic Oxidation Kinetics

In this paper, the study target is H2S gas in low concentration. After much study of all kinds of ways about H2S harnessing, which we know now, and based on the former researching of this project, we designed a compendious means. The main catalyzer is Fe3+, and after the redox of this reaction we can get sulfur (S).In my main dynamics experiments, H2S concentration is during 200 to 1500 ppm, the O2 content is 0.5~21%(volumetric proportion). After my analyzing, I found that: with the H2S concentration of the input gas increasing, the drive power of mass transfer is heightened. When the other experiment conditions are not changed, the reaction rate will also increase. From my experiment data, I got a reaction rate equation: NH2S = -1.49566 + 0.009284PH2S , r =0.999043, r2 =0.998087. So, I can consider this reaction is a first-degree reaction to H2S. Under the deferent reaction temperature, the change trend of reaction rate with the changing of H2S concentration in the input gas is almost same: all are heightened with the H2S increasing, and when the reaction temperature is 60℃, the reaction can be more better. Whether the concentration of H2S is low or high, the reaction rate is also heightened with the increasing of Fe3+ content. Especially under the low H2S concentration condition, the change trend is more obvious. When the Fe3+content increased to 0.05 mol/L, the change trend of reaction rate will be gentle. So, I can get that 0.05 mol/L of Fe3+content is better. When the other reaction conditions are same, pH influence is slight to reaction rate. Considering all conditions, pH=9 is better. In my experiment, the apparent activation energy (Ea) is 24.814 kJ/moL When the O2 content is during 0.5~10%( volumetric proportion) in the input gas, the reaction rate change trend is not obvious. But when O2 content changing from 10% to 21%, the increasing trend of reaction rate is more obvious.Under the best experiment conditions (Fe" is main catalyzer), and throw in a kind stabilizer, although the O2 content just is 0.5%, the purifying efficiency almost can be higher than 95% for a long time. When the absorbing liquid is saturated, we can input air to regenerate. At the same time, we can get sulfur after simply purifying.Therefore, this project study will be more useful to waste gas (H2S) harnessing.