Hydrogen Sulfide Removal from Yellow Phosphorus Tail Gas by Wet Oxidation Process Combined with Activated Carbon

In order to utilize yellow phosphorus tail gas, deep desulfurization(hydrogen sulfide contained less than 1mg/m3) technologies are needed. In this study, purification of H2S in yellow phosphorus tail gas was investigated by wet oxidation process combined with activated carbon, 8000m3/h scale industrialized experiment were carried out. The results show that HF and SO2 are almost removed in the alkali washing unit, but for H2S removal efficiency of only 19.1~34%, the outlet concentration of H2S is 6959~13864mg/m3. Desulfurization by wet oxidation, the concentration of H2S could be less than 60mg/m3, Vanadium-based and 888 (phthalocyanine compounds) catalysts have the highest activity for H2S. At last, a industrialized experimental on the removal of P4, PH3 and H2S from yellow phosphorus tail gas by activated carbon catalytic oxidation technology was carried out. After purification through the catalyze bed, the concentrations of impurities in the product gas were able to meet the pre-treatment standard and the concentration of P4, PH3 and H2S would be decreased to less than 1 mg/m3. Along-term test for more than 300 h was carried out, the results show that the catalytic oxidation process is feasible and stable for activated carbon catalyst.