What is the purpose of regeneration in a glycol-based dehydrator?

• A. To release water from the absorbed glycol so the lean glycol can continue absorbing water.
• B. To increase the temperature of the gas for condensation.
• C. To remove solids from glycol.
• D. To alter the gas composition by removing hydrocarbons.

Answer: (A)

Regeneration restores glycol’s ability to dry by removing the water it has picked up from the gas. After absorption, glycol becomes water-rich, so it’s heated in a reboiler to drive off that water as vapor. The resulting lean glycol is then returned to the absorber to continue removing moisture from the gas. This keeps the drying system effective; without regeneration, glycol would become saturated and stop absorbing as much water. The other options aren’t the purpose of regeneration: heating the gas for condensation, removing solids from glycol, or altering gas hydrocarbon content aren’t the main goals of this step.