Sulfur Degassing Process by BP AMOCO

Remove hydrogen sulfide (H2S) and hydrogen poly-sulfides (H2Sx) dissolved in liquid sulfur. Safety: Hydrogen sulfide is a highly toxic and potentially explosive gas. A concentration of 600 ppmv is lethal and is explosive at approximately 3.5% vol. Dissolved H2Sx is decomposed, and H2S is released in storage, during loading and unloading and also during transportation, thus leading to potentially dangerous conditions.

Product: Liquid sulfur containing 10 ppmw of H2S or less.

Sulfur Degassing Process by BP AMOCO

Liquid sulfur flowing from the Claus plant to the sulfur pit contains typically 250–350 ppmw of H2S + H2Sx. Sulfur is degassed using an active gas-liquid contacting system to release dissolved gas. Adding chemicals is not required. Sulfur from the pit is pumped into the degassing tower where it is contacted counter-currently with hot compressed air over a fixed catalyst bed. Degassed sulfur is returned to the product section of the sulfur pit.

Operating conditions: The operating temperature in the sulfur degassing tower can vary from 125°C to 150°C depending on the temperature in the sulfur pit. The operating pressure drop is around 0.3–0.5 bar. Treated sulfur has a residual H2S level in the range of 5–10 ppmw.

Materials of construction: Mainly carbon steel. Aluminized steel may be used for the degassing tower.

Licensor: BP AMOCO through SIIRTEC NIGI


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