Solvent Processes

TriEthylene Glycol (TEG)

Water absorption with TriEthylene Glycol (TEG) is a very well known and proven technology. It is the most common process used for gas dehydration.

Lean TEG in a gas/glycol contactor absorbs the water contained in the gas to be treated counter-currently. At the bottom of the contactor, the rich TEG (containing the absorbed water) is sent to the regeneration section where water is vaporized in a Reboiler at low pressure (close to atmospheric pressure).

Depending on the requested lean TEG purity, the lean TEG produced in the reboiler can be either:

• Pumped directly to the gas/glycol contactor (low TEG purity required)
• Stripped with stripping gas before being pumped to the gas/glycol contactor (high TEG purity required)

Drizo®

As the exclusive licensor of the Drizo® technology, Axens Solutions provides operators with the most efficient and environment-friendly dehydration solution.

Thanks to its specific Drizo® loop for optimum TEG stripping, Drizo® enables higher dehydration efficiency while minimizing BTEX/CO₂ emissions, making it the best available glycol-based dehydration process. Glycol dehydration performances rely on final glycol purity achieved by glycol regeneration. With Drizo®, up to 99.995 wt% of glycol purity is achieved instead of the typical 99.95 wt% of conventional glycol units, enabling down to 1 ppm vol. residual water in treated gas. With minimum additional equipment compared to conventional glycol units, Drizo® features higher dehydration performances for a marginal increase in investment cost. The simplicity of the Drizo® loop implementation makes it a perfect candidate to easily upgrade the performances and the environmental footprint of existing TEG units.