Claus process extended

Extended Claus processes maintain the 2 1 ratio of HS to SO2 in the tail gas. The reaction is extended at low temperatures, below the dewpoint of sulfur. Some processes of this type are the Sulfreen, IFP Clauspol, and CBA processes (9). 

Process Type/Name Extended Cold Solid Bed Claus Reaction ... 

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Claus felt that the cyclic process could be simplified if the hydrogen sulfide were converted to sulfur by an iron catalyst in a kiln. It was later found that dried Weldon process mud or bauxite would operate as a catalyst at a lower temperature than ferric oxide. This not only extended the life of the kiln but also increased sulfur yield. Problems with blocked beds were overcome as technology evolved and proper reactors containing solid catalyst particles were developed. Thus, the modem Claus sulfur recovery process originated from the statutory obligation to remove sulfur from town gas in Victorian gas works. 

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