Overview Hydrogen sulfide is produced in natural gas purification, petroleum refining, and production processes such as gas production, tanning, pharmaceuticals, papermaking, and synthetic chemical fibers. Hydrogen sulfide is a colorless gas, has a pungent stench, is volatile, and presents a blue flame when it burns. Hydrogen sulfide is one of the main pollutants in the atmosphere, which not only harms human health, but also severely corrodes equipment. The treatment of hydrogen sulfide started earlier. In 1809, Craig used the lime milk purifier to desulfurize. In 1849, Lanning and Hills obtained the patent of dry iron oxide method. In 1870, the United States developed an iron oxide preparation method. This dry iron oxide method is still used in the field of desulfurization. 100 years old. The solution method appeared in the 1930s and 1940s, in which iron hydroxide was suspended in lye for desulfurization. Since the 1950s, the ammonia method has been widely adopted in Western Europe. The arsenic-alkali method appeared in the 1960s, using arsenide as a catalyst. As arsenic compounds are highly toxic, they are gradually replaced by non-toxic catalysts. For example, the hydroquinone method, A.D.A. method, Fumax method, and Dakhax method all use non-toxic catalysts. These methods are all rapidly developing technologies in recent years. On the other hand, the solution method of absorbing waste liquid treatment technology has also been continuously developed, forming different desulfurization processes.
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