Hydrogen sulfide removal from gas stream

The membrane-aided treatment of natural and associated petroleum gases is aimed at both recovery of acid gases (ÑÎ2 and Í2S) making the gas compliant with the gas pipeline requirements, and removal of methane in the tertiary oil recovery processes for further injection of carbon dioxide in formation. Natural and associated petroleum gases often contain chemically aggressive or easily condensable components which materially affect the membrane performance and the degree of APG recovery. Removal of these components and/or control of their content within the critical limits of the membrane capacity require an expensive treatment. Furthermore, conventional membranes used for acid components removal during APG processing accumulate heavy hydrocarbons in the retentate which results in condensation commensurate with the membrane element volume. The above said restricts the area of application of conventional membranes by APG recovery and APG processing and leads to their functional complexity and drives operating costs.

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General information

The membrane developed by Grasys is predominantly designed for removal of hydrogen sulfide, moisture and carbon dioxide together with heavy hydrocarbons and excludes the possibility of hydrocarbons and moisture condensation within the membrane device.

The membrane systems for acid gases removal from natural and associated gas offered by the company are stable to high concentrations of acid components, highly efficient in hydrogen sulfide removal and extremely cost effective in operation.

The adoption of Grasys membrane technology allows

  • Processing gases with the hydrogen sulfide content of up to 5 at 100% vol. humidity and with the carbon dioxide content of up to 30–35% vol.
  • Reducing the content of hydrogen sulfide in the product gas up to the requirements allowing its use as a fuel gas for power plants, oil heating furnaces and boiler houses
  • Bringing product gas in line with the GOST 5542–87 (ÎÑÒ 51.40–93.) requirements subject to insignificant (up to 0.1% vol.) hydrogen sulfide concentrations
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