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Gas sweetening is a process that has to be executed to remove hydrogen sulphide (H2S) from gasses. Gas sweetening is sometimes referred to as amine treating. Amine treating can be used in refineries, petrochemical plants, natural gas processing plants and other industries. In oil refineries or chemical processing plants it is more referred to as gas sweetening. This is because they result in a product which no longer has the sour and foul odours of H2S. As amine treating does not recover the sulphur in elemental form it must be followed by a sulphur recovery step.
With absorption and chemical reactions it is possible to remove H2S and CO2 from natural gas and liquid hydrocarbon streams. The three most common amine gas treating methods are:
Has a higher affinity for H2S than CO2 which allows some CO2 to slip while retaining H2S removal capabilities.
This process is used in low pressure natural gas treatment applications requiring stringent treated gas specifications.
For medium to high pressure treating. Doesn’t require reclaiming, as do DGA and MEA systems.
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