Hydrogen sulfide removal technologies

Overview of Hydrogen Purification Technologies 9.2.2.1 Hydrogen Sulfide Removal Technologies... 

T0341 Geo-Microbial Technologies, Inc., Hydrogen Sulfide Removal T0518 Met-Chem, Metal Kleen A... 

We can expect continuing growth of hydrocracking because it is able to satisfy both of these requirements. Pollutants are removed as ammonia and hydrogen sulfide. The technology is readily available (29) for recovering these materials for commercial use. Water requirements are moderate, and the self-contained nature of a hydrocracker makes it particularly attractive when close environmental control is required. 

Three technologies are described for hydrogen sulfide removal. Chemical absorption with metal oxide or metal hydroxide, such as the reaction of H2S with CaO to produce CaS and water, is an effective method. Partial oxidation, such as the Claus reaction, converts hydrogen sulfide through reaction... 

The technology is primarily applicable to the removal of inorganic fumes, vapors, and gases (e.g., chromic acid, hydrogen sulfide, ammonia, chlorides, fluorides, and SOj) volatile organic compounds (VOC) and particulate matter (PM), including PM less than or equal to 10 micrometers ( m) in aerodynamic diameter (PM,q), PM less than or equal to 2.5 m in aerodynamic diameter (PMj 5), and hazardous air pollutants (HAP) in particulate form (PM ap)-... 

LO-CAT A process for removing hydrogen sulfide and organic sulfur compounds from petroleum fractions by air oxidation in a cyclic catalytic process similar to the Stretford process. The aqueous solution contains iron, two proprietary chelating agents, a biocide, and a surfactant the formulation is known as ARI-310. The sulfur product is removed as a slurry. Developed in 1972 by Air Resources (now ARI Technologies) and first commercialized in 1976. Over 125 units were operating in 1996. An improved version, LO-CAT II, was announced in 1991. 

Reactive absorption is probably the most widely applied type of a reactive separation process. It is used for production purposes in a number of classical bulk-chemical technologies, such as nitric or sulfuric acid. It is also often employed in gas purification processes, e.g., to remove carbon dioxide or hydrogen sulfide. Other interesting areas of application include olefin/paraffin separations, where reactive absorption with reversible chemical complexation appears to be a promising alternative to the cryogenic distillation (62). 

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