The process technology has the following characteristics.
1. It is very important to select high-quality desulfurization catalyst: in wet oxidation desulfurization, the oxidation of H2S to elemental sulfur is realized by means of oxygen carrier catalyst in desulfurization liquid. The catalyst largely determines the desulfurization efficiency of wet oxidation method, a series of important indexes such as elemental sulfur productivity, alkali consumption, regeneration efficiency and side reaction yield. Therefore, choosing a high-performance catalyst as redox agent has become the key to this process operation.
2. No matter what kind of catalyst is used, the common feature of its chemical reaction process is that it should be divided into three steps: one step is to absorb H2S in the gas with ammonia or soda solution for neutralization reaction. In the second step, the oxygen carrier catalyst is used for catalytic oxidation reaction to oxidize HS - and S-2 into elemental sulfur. The third step is to add or spray the self-priming air oxidation deactivated catalyst to regenerate and recycle it. At the same time, the elemental sulfur is separated by flotation and melted. Moreover, from the process point of view, the one-step absorption reaction must be carried out in the desulfurization tower. The gas-liquid two-phase countercurrent contact transfers H2S from the gas phase interface to the liquid phase interface through mass transfer (packing) and enters the main body of the liquid phase. The acid-base neutralization reaction generates the corresponding salt and converts it into rich liquid. This process is controlled by the gas film and belongs to diffusion absorption. However, the two-step chemical reactions of catalysis, oxidation and sulfur evolution are also mainly carried out in the desulfurization tower. Therefore, the coexistence pattern of this complex phase system is also formed. Therefore, mass transfer area, spray density, liquid gas ratio, alkalinity, pH value, catalyst concentration and reaction temperature will affect the selectivity of absorption, sulfur evolution regeneration and gas purification.
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