A glycol dehydration unit is typically a simple unit – an absorber tower and a reboiler
The inlet, water-saturated gas enters the system at the base of the absorber
The gas flows upward through the down-flowing TEG making contact on random packing or through bubble cap trays
The TEG removes the water from the gas, allowing for the now-dry gas to exit through the top of the absorber
The water saturated TEG flows into the reboiler where the mixture is separated by boiling the water off
The TEG is then pumped back to the absorber to start the process over again.