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Gas Dehydration Systems

Uniquip - consolidating activities in the areas of gas treatment and handling.

  • to prevent hydrate formation in downstream process equipment and/or transmission pipe lines
  • to prevent corrosion in downstream process equipment and/or pipe lines in acid gas streams
  • to meet sales gas water dewpoint specifications

The most popular gas treatment technologies utilise aqueous solutions and dehydration therefore typically follows gas treating and/or gas compression. Techniques for dehydrating natural gas include:

  • Absorption using liquid glycol desiccants (MEG / TEG)
  • Adsorption using solid desiccants (Mol Sieve / Silica Gel / Activated Alumina)
  • Inhibition by injection of hydrate point depressants (Glycol / Methanol Injection)
  • Dehydration by expansion refrigeration (Low Temperature Separation)

Capital and Operating cost economics usually favour glycol dehydration over other processes where this process will meet the dehydration specifications required. TEG is the most widely used glycol because of lower vapour losses combined with a greater dewpoint suppression. Solid desiccant processes such as molecular sieves can produce outlet water content as low as 1ppm. As a result they are widely used for feed streams to cryogenic processing systems.

All dehydration processes have advantages for specific applications but also have disadvantages and potential issues for the inexperienced.