Sulften process

Several processes have been developed based on the oxidation approach, but, with some exceptions, such as the Linde Clintox process (Heisel and Marold, 1992) these have not been commercial successes because of the complexity of SO2 recovery processes and their comparatively low SO2 removal efficiencies. Hydrogen sulfide, on the other hand, can be removed at very high efficiency by a number of processes, including the selective amine processes discussed in Chapter 2. Processes that involve the conversion of Claus plant tail gas sulfur compounds to H2S and the removal of this H2S are discussed in the following sections. Processes reviewed include Parson s Beavon Sulfur Removal (BSR) process. Shell s SCOT process, FB and D Technologies Sulften process, the TPA Resulf process, and the Exxon Flexsorb SE Plus process. 

The Resulf process, which is licensed by TPA, Inc., is very similar to the BSR/MDEA, SCOT, and Sulften processes. The Claus plant tail gas is heated mixed with a reducing gas passed through a catalyst bed where sulfur vapor, SO2, COS. and CS2 ate converted to H2S cooled and passed through a selective amine absorber. Acid gas from the amine stripper is recycled to the Claus plant. It is claimed that a high efficiency version of the process, Resulf-10, produces a vent gas from the amine absorber containing a maximum of 10 ppm H2S (TPA Inc., 1994). 

Sulften A process for removing hydrogen sulfide from the tail gases from the Claus process. The solvent (Ucarsol HS 103) was developed by the Union Carbide Corporation the process was developed by Ford Bacon and Davis, Dallas, TX. 

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