Liquid Sulfur Degassing

Important component of the Claus sulphur recovery system to remove H2S

Liquid sulphur produced by the Claus process contains residual H2S in both chemically combined and physically dissolved forms. The total residual H2S in the liquid (200 – 400 ppmw) depends on numerous operational factors but its presence poses a considerable safety risk as degassing to headspaces in containers and even from solid formed from the liquid can lead to lethal gas phase concentrations. Without adequate draft in storage systems, concentrations may exceed the lower explosive limit for H2S in air. The process of liquid sulfur degassing involves the use of a degassing unit, which is typically a vessel or tower designed to remove hydrogen sulfide gas from liquid sulfur. The liquid sulfur is heated to a specific temperature and then passed through the degassing unit, where the hydrogen sulfide gas is removed. The degassed sulfur is then cooled and stored for further processing or transport. There are several methods used for liquid sulfur degassing, including vacuum degassing, steam stripping, and air stripping. Vacuum degassing involves the use of a vacuum to remove hydrogen sulfide gas from the liquid sulfur. Steam stripping uses steam to strip the hydrogen sulfide gas from the liquid sulfur, while air stripping uses air to remove the gas.

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