Study On New Technology Of Removal H₂S In Waste Gas With Wet Oxidation Method

This thesis provides new methods of getting rid of H2S efficiently——Fe2(SO4)3 solutions and Cu-Fe system——with the characteristics of simple compound of solvents, no decomposition of organic compounds, simple techniques and common operation conditions. The solvents can be easily regenerated by air, and can be recycled for reuse. In the desulfurization process, there are no needs of high temperature and high pressure, any chemical materials but air, and there are no harmful byproducts created. And there is no re-pollution. The sulfur in H2S can be recycled in the form of sulfur element. So the cost of investment and operation is low, and it can be easily industrialized.In part one of this thesis, we looked into the efficiency of getting rid of H2S via conditional experiments, identified the reacting conditions in iron solutions, and gave some analysis of the data. The desuphurization efficiency can be improved to more than 98 per cent in industrial devices by more tower shutters, increasing the ratio of liquid to gas, and more stirring. There are no problems of solvents decomposition existing in chelate iron system, and no problem of volatilization of HCl existing in FeCl3 system.In part two, a new kind of inorganic absorbing system——"Cu-Fe system" is contrived. That system is composed of two common inorganic salts, which has extremely high desulfurization efficiency of almost 100 per cent, and its desulfurization range is large (in the range of one ppm to 10,000 ppm).In part three, a simple and rational technical process is provided. And the process of absorption-regeneration can be realized by one single device.