Natural gas dehydration removes hydrates which can grow as crystals and plug lines and retard the flow of gaseous hydrocarbon streams. Dehydration also reduces corrosion, eliminates foaming, and prevents problems with catalysts downstream. Natural gas is dehydrated according to the customer’s specifications for maximum water content.
The most common dehydration method is the absorption of water vapor in the liquid desiccant Triethylene Glycol (TEG). The withdrawal of the water rich glycol from the bottom of the absorber is facilitated by a level control. High and low level shut down can be applied to the reboiler, surge tank and flash separator.