Sour gas is a natural gas which contains hydrogen sulphide (H2S). High concentrations of H2S inside refineries and gas processing plants can result in the formation of acid gases causing excessive wear of expensive equipment and pipework. The removal of H2S is referred to as gas sweetening.
The gas sweetening process uses amine solutions (alkylamines) to remove the hydrogen sulphide and also carbon dioxide from the gas. GLP design, build, install and commission gas sweetening systems based on the reliable ‘figure eight’ absorption process.
The sour natural gas is contacted with a lean amine solution in a counter-current absorber where the H2S and CO2 are absorbed into the amine solution. The resulting gas leaving the absorber is free of those compounds and released as a sweet gas. The amine solution, rich with H2S and CO2, is heated in a stripping column to liberate H2S and CO2 from the solution before being pumped back into the absorber. The acid gas leaving the top of the stripper column is mostly H2S and CO2 and can be processed or disposed of as required.
GLP supplies gas sweetening systems to:
- Petroleum refineries
- Gas processing plants
- Petrochemical plants