Since the 1940s, the present form of the Claus sulfur recovery unit (SRU) has been successfully applied in the refining and gas processing industries.
Since the 1940s, the present form of the Claus sulfur recovery unit (SRU) has been successfully applied in the refining and gas processing industries. The SRU has improved to the extent of being able to recover elemental sulfur from hydrogen sulfide (H2S)-bearing streams with up to 98% efficiency on a continuous basis, depending on the quality of the feed stream. Even these low emissions from SRUs were often considered too great, and legislation in many countries required recoveries in excess of the capability of this process. Emissions levels as low as 250 ppm of SO2 have been set. These more exacting standards have necessitated the development of the tail gas treating unit (TGTU) to extend
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