TEG Dehydration Contactor & Circulation Rate Calculator
Size triethylene glycol (TEG) absorption contactor columns, calculate required glycol circulation rates (GPM & gal/lb H2O), reboiler thermal duty, and water dewpoint depression per GPSA Section 20.
Natural Gas Flow & Operating State
Glycol Circulation & Regeneration
Equipment Sizing & Circulation Rates
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
Why is Triethylene Glycol (TEG) the universal solvent for natural gas dehydration?
TEG combines exceptional hygroscopic water affinity with low vapor pressure (minimizing glycol vaporization losses into treated gas), high thermal stability (resisting thermal degradation up to its 404°F / 206°C boiling point), and ease of atmospheric regeneration to 99.0%+ purity.
What is the standard TEG circulation ratio in gas plant design?
GPSA Section 20 recommends a circulation ratio of 2.5 to 3.5 gallons of lean TEG per pound of water vapor removed from the gas stream (typical design default = 3.0 gal/lb). Higher circulation rates provide slightly higher dew point depression but exponentially increase reboiler fuel consumption and glycol pump wear.
How is 99.8% ultra-pure lean TEG achieved in the reboiler?
At atmospheric pressure, TEG begins thermal degradation at 404°F (206°C), which limits reboiler concentration to 98.7% - 99.0% wt. To achieve 99.5% to 99.8% purity for deep dew points, stripping gas (superheated dry fuel gas) is bubbled through the reboiler stripping column, lowering the partial pressure of water vapor and driving the concentration above 99.8%.