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  • I.S.G. S.p.A.

    I.S.G. S.p.A. VAT Registration nr:  00844990150
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Dehydration Unit

Two systems can be considered for gas dehydration:

  • ADSORPTION using solid desiccants (Molecular Sieves, Activated Alumina, Silica Gel)
  • ABSORPTION using glycol as absorption medium


Fixed Bed System that utilizes different type of adsorbent like Molecular Sieves, Activated Alumina and Silica Gel to dry various Gas and Liquid Hydrocarbons.  Application for Gas Plant, Refineries and Petrochemical complex. With this technology is possible to reach very low dew point ( <0.1 ppmv H2O).

Adsorption dryers may be equipped with one (batch operation) but typically two, three four beds that operates in adsorption and regeneration mode.

Each adsorber vessel is equipped with switching valves for the cycle operation. The adsorbent need to be regenerated and this can be performed in two mode:

  • TSA (temperature swing adsorption)
  • PSA (pressure swing adsorption)

I.S.G. S.p.A. supply complete regeneration system that for TSA case includes heat exchangers (heater and cooler), water separator, recycle compressor (if required), filter and associated  instruments and equipment.


TEG (triethylene glycol) is the standard choice for gas dehydration to guarantee pipeline dew point. TEG unit are complete with Contactor and Regeneration System.  Absorber typically contains trays or packing to promote contact  between the gas and liquid. In the absorber, gas is contacted with the lean glycol entering at the top, and most of the water is removed from the gas into the glycol. The dry gas exits the top of the absorber. The rich glycol is letdown under pressure to a flash tank to remove light hydrocarbons and then sent to the regenerator that includes different type of equipment for the distillation and stripping and water from the glycol.