What chemical species is commonly used for TEG regeneration?

The chemical species commonly used for TEG (triethylene glycol) regeneration is stripping gas, typically dry natural gas or nitrogen, and heat. TEG is used as a dehydrating agent to remove water from natural gas. During the absorption process, TEG absorbs water from the wet natural gas, becoming rich TEG. To reuse the TEG, the absorbed water must be removed in a regeneration process. This is typically done by heating the rich TEG in a regenerator, also known as a still, to a temperature where the water is vaporized. In addition to heat, a stripping gas is often used to further enhance the removal of water. The stripping gas is typically dry natural gas or nitrogen, which is passed countercurrently through the TEG in the regenerator. The dry gas reduces the partial pressure of water vapor, driving the water out of the TEG and carrying it away. The regenerated, lean TEG is then cooled and returned to the absorber to continue the dehydration process. The combination of heat and stripping gas allows for effective removal of water and regeneration of the TEG.