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Sulfur handling - Shell sulfur degassing process

Applications: The Shell Sulphur Degassing Process has been developed to remove H2S and H2Sx from liquid sulphur eliminating potential toxic and explosion hazards associated with handling, transport and storage of liquid sulphur. Elemental sulphur produced by the Claus process contains both physically dissolved H2S and chemically bound H2S in the form of hydrogen polysulfides (sulphanes): H2Sx. Liquid sulphur produced typically contains 250-350 ppm wt H2S as H2S and polysulfides.

The principle of sulphur degassing is to accelerate decomposition of the polysulfides according to H2Sx ↔ H2S + Sx-1 and to remove the dissolved H2S from the liquid sulphur. In the Shell Sulphur Degassing Process, the sulphur is degassed to less than 10 ppm wt H2S/H2Sx.

Description: Degassing is carried out as a continuous process in the degassing compartment of the Claus plant dedicated vessel. The actual degassing takes place in the bubble column where sulphur is vigorously agitated by bubbling air through the liquid sulphur.

As the bubble column, provided with separation baffles, is open at the bottom and the top, the sulphur can circulate through the bubble column and a thorough mixing with the total content of the degassing compartment is achieved.

The process does not use a catalyst and has no moving parts.

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