Glycol Dehydrators

Triethylene glycol (TEG) is the predominant liquid desiccant employed to remove water vapor from natural gas streams. ETI is an industry leader in providing glycol dehydration equipment for natural gas storage, gas transmission and gas gathering applications.

Process Overview
Wet gas enters the absorber contacting the lean glycol in a packed or tray section where water vapor is absorbed into the glycol. Rich, water-laden glycol exits from the lower section of the absorber and is piped to the regeneration system while dry gas exits the top of the absorber.

Rich glycol passes through a reflux coil in the reboiler still, preheats in a glycol/glycol exchanger and then enters the flash tank. In the flash tank, hydrocarbons and dissolved gas are separated from the rich glycol. The rich glycol exits the flash tank and passes through a charcoal filter, sock filter, and is subsequently preheated in another glycol/glycol exchanger prior to entering the reboiler through the reboiler still column. The rich glycol is heated to approximately 400°F as water is boiled off and exits through the vent atop the reboiler still.

Lean glycol is cooled prior to being pumped through a glycol/gas heat exchanger and into the absorber to continue the process. Water removal depends on several factors such as: gas pressure and temperature, gas composition, glycol circulation rate, glycol purity, and the efficiency of glycol-to-gas contact.

Emission Abatement – Still Column Effluent
As a compliment to our glycol dehydration equipment, ETI can provide enclosed flares or thermal oxidizers to destroy any hazardous air pollutants (HAPs) including Benzene, Toluene, Ethylbenzene and Xylene (BTEX) as well as Volatile Organic Compounds (VOCs). Destruction efficiencies range from 95% to 99.9% depending on equipment design.


Technical Innovations Available from ETI

  • High Purity Glycol
  • Low Emissions Burners
  • Emission Abatement Equipment- Enclosed Flares, Thermal Oxidizers, Vapor Recovery Units
  • High Efficiency Reboiler Designs Including Heat Recovery


Equipment Provided by ETI for Glycol Dehydration Applications

  • Complete Systems for Gas Storage and Gas Gathering Applications
  • Replacement Components Including Glycol Reboilers and Complete Regeneration Systems
  • Emission (BTEX, VOC) Abatement Equipment, Enclosed Flares, Thermal Oxidizers and Vapor Recovery Systems
  • Process Automation and Electronic Flame Safeguard Systems


65 gpm Glycol Regeneration Unit with forced draft burner.