Abstract
Natural gas from high-pressure wells is routinely separated into hydrocarbon condensate and water using field separators at the well. Natural gas is considered “sour” if it contains more than 5.7mg per normal cubic meter (mg/Nm3) of hydrogen sulfide (H2S) (0.25 grains per 100 standard cubic feet [gr/100 scf]). The most common approach for removing the sourness from H2S gas is to absorb it in an amine solution. Carbonate processes, solid bed absorbents, and physical absorption are only some of the methods used by other sweetening facilities. By far the most common method for converting H2S into elemental sulfur is the Claus process or a derivative thereof. A tail gas cleaning unit is used to remove any leftover sulfur compounds since the exit streams from Claus plants often do not meet environmental emission restrictions. The three most common processes are Shell Claus off Gas Treating, SUPERCLAUS, and cold-bed adsorption.
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