Researches On Process Of Removing H₂S With Chalate Iron

In this paper, the study target is high concentration of H₂S gas from refinery.After much study of all kinds of ways about treatment of H₂S gas.A method of chelate iron is investigated further.A new technology process is designed to treat high concentration of H2S gas from refinery based on improving solvents and operating conditions, and the new process has characteristics of economy, high efficiency, simple operation and low energy consumption.In the experiments, firstly, the process conditions of absorption and regeneration on the desulfurization of a compound chelate iron system are investigated, the optimum reaction conditions are obtained consequently. The best process parameters of the absorption are: the concentration of a compound ferric citrate and EDTA is 0.45 mol·L^-1, pH=5.0⁷.0, the operation temperature is room temperature, the flow ratio of acidic gas is 0.04 m3·h^-1, the liquid-gas ratio is 5; The best process parameters of the regeneration are: [Fe2+L]=0.45mol·L^-1, G=1.25m3·h^-1, pH=4.0⁶.0, the temperature is 307.15K, the regeneration time is 15 minutes.And then, this thesis does contrast experiments on the compound chelate iron system and the single ferric citrate system and educes the conclusion about the compound system's desulfurization efficiency, regenerating efficiency or stability is better than the single system's. The desulfurization efficiency is nearly 100% and regenerating efficiency is more than 90% under the optimum conditions. The sulfur, which produced in the reaction can be removed by the filter.