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Gas Sweetening

Following the initial separation of oil, gas and water, the gas should be further conditioned. Gas conditioning comprises of Gas Sweetening and Dehydration involving the removal of CO2, sulphur content (H2S), and water vapour (water saturated in gas). Both sulphur and carbon dioxide must be removed due to their toxic (sulphur) and corrosive nature. Common methods of gas sweetening are absorption by chemical and/or physical solvents, combined (hybrid) absorption, adsorption using molecular sieves and physical separation.

Fameline Oil & Gas is in position to provide three of the most common aforementioned methods for Gas Sweetening through Generon including:

  • Amine sweetening (MEA, DEA, MDEA, DGA)
  • Membrane sweetening
  • PSA sweetening

Amine sweetening is an effective method leaving very low concentrations of sulphur and carbon dioxide in a single step, while PSA is cost effective only when the concentration of acid gas in the feed is less than about 1%. Membrane sweetening is an alternative method with which Gas Sweetening and Dehydration can be achieved in the same step with advantages including ease of installation, space and weight savings, less maintenance, and over 95% hydrocarbon recovery.

Each method has its own characteristics, thus an engineering team is ready to advise the most suitable method for any application.

  Amine Sweetening system Generon Membrane Technology PSA Technology
Flow Rate Up to 50 MMscf/d Up to 500 MMscf/d < 20 MMscf/d
Pressure 150 – 1200 psi Up to 2000 psi 100 – 400 psi
Temperature <710C   380C
Sulphur Content < 4ppm (roughly < 0.25 grains of sulphur/100scf) 10 ppm to < 5 vol% H2S in feed < 0.01 grains of sulphur/100scf
CO2 Content < 0.01 %mole < 2% by volume < 0.01 %mole