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Sulphur Recovery SUPERCLAUS® Process

The SUPERCLAUS® process recovers elemental sulphur from H2S-containing gases originating from gas treating and sour water stripper plants. Yields up to 99.2% overall sulphur recovery, without any further tail gas clean-up, are possible. The SUPERCLAUS® process consists of a thermal stage followed by minimum three catalytic reaction stages, with sulphur removed between stages by condensers. The first reactors are filled with standard Claus catalyst, while the final reactor is filled with selective oxidation catalyst.

In the thermal stage, the acid gas is burned with a sub-stoichiometric amount of controlled combustion air, such that the tail gas leaving the last Claus reactor contains typically 0.8-1.0 vol.% of H2S. The selective oxidation catalyst in the final reactor oxidizes the H2S to sulphur at an efficiency of more than 85%.

If a sulphur recovery rate of more than 99% is required, a third Claus reactor stage can be installed upstream of the selective oxidation reactor.

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