| 摘要 |
<p>PROBLEM TO BE SOLVED: To remove H2 S in a gas containing CO2 such as blast furnace gas in a high desulfurization ratio for a long time while controlling the decrease in the desulfurization ratio with the passage of time by making a gas containing CO2 and H2 S contact an aqueous solution containing Pb<2+> ions and CH3 COO<-> ions. SOLUTION: In the desulfurization of a gas containing CO2 and a trace quantity of H2 S which is generated in a reduction process of minerals containing sulfur, the gas is contacted with an aqueous solution containing Pb<2+> ions and CH3 COO<-> ions. In this process, H2 S reacts selectively with lead acetate to produce PbS, and a desulfurization reaction lasts so long as Pb<2+> ions exist in the aqueous solution. The produced PbS is almost insoluble in water, and sulfur compounds produced by desulfurization are deposited as solids. Besides, lead acetate is highly soluble in water, and sulfur compounds produced by desulfurization can be separated by a method such as filtration.</p> |
