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Gas Dehydration & Purification

Gas drying aims to prevent hydrate formation and free water condensation in gases. It is crucial in natural gas systems to avoid equipment blockage and corrosion issues, both for transportation facilities and downstream cold processes.
Gas Dehydration & Purification

Axens Offer

Axens provides operators with the broadest range of dehydration and purification solutions available on the market, from glycol absorption processes to a wide portfolio of dedicated adsorbents. Thanks to its long experience in the field of Gas Dehydration, Axens is able to offer a fit-on-purpose and CAPEX-effective solution to best match operators’ requirements, whatever the dehydrated gas specifications.

Axens dehydration portfolio covers all types of gases for onshore and offshore applications: sweet natural gases, sour gases with various CO2/H2S contents and even pure acid gases such as CO2 in CCUS applications.

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Ensuring water dewpoint specification by an efficient and cost-effective technology is a major challenge in the natural gas industry. Processes using TriEthylene Glycol (TEG) as a dessicant are the most widely used and field proven solutions for flexible and efficient gas dehydration over various operating conditions. They are suitable for a large range of water specifications by adapting the TEG regeneration scheme. Axens offers the full spectrum of TEG technologies, ranging from conventional TEG units without or with stripping gas for non-stringent applications, up to its enhanced TEG Drizo® technology to achieve the tightest water specifications that match the requirements of most NGL recovery applications.

Process Technologies

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.

Unmatched glycol purity achieving 1 ppm vol. residual water in treated gas
Cleaner process with minimized BTEX/CO2 emission
> 30 references worldwide on both onshore and offshore sites most of time supplied as a complete turn-key module
Related Offer

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)
> 150 TEG units licensed
Easy operability & high flexibility
Cost-effective technology for water removal
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Consulting, Supply & Support

Consulting, Studies & Audits

Axens offers a customized approach, including tailored studies, audits and consulting services, covering technical and operational challenges.

Unit Revamps & Retrofits

You face many challenges, which include operating in a safe, reliable and environmentally sound manner while responding to changing markets dynamics.

Modular Units

A modularization strategy offers superior benefits versus on-site manufacturing. During the last 40 years, Axens has supplied over 500 modular units, both onshore and offshore, providing tailor-made designs according to client project specifications.

Customer Training

Designed for all Axens technologies, dedicated to operators & engineers, Axens offers customized training solutions to all our licensees, covering the whole range of Axens technologies.

Technical Support & Performance Management

Axens is fully committed to be your partner and provide assistance and support during your project lifecycle, from conception to start-up & running operations.

Digital Services & Applications

Axens' digital platform combines real-time data and digital solutions to optimize operations, reduce environmental impact, and lower costs while maximizing profitability. By delivering actionable insights and detailed performance reports, it enhances asset operation and performance for smarter, more efficient outcomes.

The sales gas production requires controls for both the water content and the hydrocarbon (HC) dewpoint of natural gases. The HC dewpointing is requested either to comply with the heating value or the HC dewpoint temperature specifications, or to extract and recover valuable Natural Gas Liquids (NGL) such as LPG or HC condensates to increase the gas plant revenues.

The water and HC dewpoints are usually performed in two steps:

  • First, gas dehydration - for instance with TEG or regenerative adsorbent
  • Then, HC dewpointing by cooling the dry feed gas to the appropriate dewpoint temperature

Process Technologies

IFPEXOL™

IFPEXOL™ is a simple, highly flexible and environmentally friendly process that uses recoverable methanol to allow water and HC dewpointing in a single cooling step. This technology virtually removes the complete dehydration unit from the processing plant. It provides CAPEX and OPEX savings while eliminating the on-site atmospheric emissions (CO2, BTEX) associated with TEG Unit off-gas disposal.

IFPEXOL™ consists in using a portion of the water-saturated feed gas to recover the methanol contained in the methanol-water aqueous mixture collected in the cold process.

The methanol is stripped off and recovered as vapor in the overhead gas stream leaving the stripper, while nearly pure liquid water is drawn off from this column. The wet feed gas, containing the recovered methanol, is chilled to the required dewpoint temperature by any appropriate means (JT expansion, turbo-expander or external refrigeration).

A dry and HC-dewpointed sales gas and a HC liquid stream (NGL) are produced while the methanol-water mixture is collected separately and recycled to the IFPEXOL™ stripper.

No flash gas or low pressure off-gases are generated. Any freezing issues are avoided in the cold process thanks to the presence of the methanol that is recirculated into the cold process to inhibit the formation of hydrates or ice. A small amount of pure methanol is injected under automatic control to maintain the correct methanol concentration in the process.

> 20 IFPEXOL™ industrial references
Low CAPEX & Low OPEX with minimimal equipment
No flaring and no BTEX emissions

Consulting, Supply & Support

Consulting, Studies & Audits

Axens offers a customized approach, including tailored studies, audits and consulting services, covering technical and operational challenges.

Unit Revamps & Retrofits

You face many challenges, which include operating in a safe, reliable and environmentally sound manner while responding to changing markets dynamics.

Modular Units

A modularization strategy offers superior benefits versus on-site manufacturing. During the last 40 years, Axens has supplied over 500 modular units, both onshore and offshore, providing tailor-made designs according to client project specifications.

Customer Training

Designed for all Axens technologies, dedicated to operators & engineers, Axens offers customized training solutions to all our licensees, covering the whole range of Axens technologies.

Technical Support & Performance Management

Axens is fully committed to be your partner and provide assistance and support during your project lifecycle, from conception to start-up & running operations.

Digital Services & Applications

Axens' digital platform combines real-time data and digital solutions to optimize operations, reduce environmental impact, and lower costs while maximizing profitability. By delivering actionable insights and detailed performance reports, it enhances asset operation and performance for smarter, more efficient outcomes.

Natural Gas plants and LNG facilities face the challenge of solving feedstock contamination problems. The use of dedicated adsorbents helps operators to achieve specifications for improving their operations, upgrading the quality of their products or minimizing pollution.

Continuous industrial growth and market evolution has permitted Axens to become a recognized world leader in the supply of adsorbent products. For deep dehydration and purification applications Axens offers fixed beds of regenerable adsorbents with AxSorb® series. This portfolio includes molecular sieve desiccants with high and tunable selectivity, ideally supplemented with optimized activated alumina product.

Adsorbents

Adsorbents

Drying Series Adsorbents

Water removal applications are widely encountered in the industry sector. Activated alumina and molecular sieves stand at the forefront of the several different materials available on the market.

Adsorbents

Mercury Removal Adsorbents

Mercury removal from hydrocarbons is crucial due to HSE-related issues, corrosion problems and downstream catalyst poisoning.

Adsorbents

Purification Series Adsorbents

Material specially developed to achieve your feedstock’s specification requirements.

Adsorbents

Sulfur Removal Adsorbents for Oil, Gas & Petrochemicals

Hydrogen sulfide (H₂S), COS, mercaptans or sulfides are common contaminants that must be removed from various gases and liquids such as natural gas, NGLs, LPGs, cracked gases, olefins or biogas.

Consulting, Supply & Support

Consulting, Studies & Audits

Axens offers a customized approach, including tailored studies, audits and consulting services, covering technical and operational challenges.

Technical Support & Performance Management

Axens is fully committed to be your partner and provide assistance and support during your project lifecycle, from conception to start-up & running operations.

Explore some

Resources

Case Study

Case Study - DRIZO® revamping of offshore TEG unit improves NGL recovery: THE EKOFISK CHALLENGE

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Technical article

Technical Article - Drizo® revamping of offshore TEG unit improves NGL recovery: the Ekofisk challenge

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Technical article

Technical Article - Solving Aromatic and CO2 Emissions with the Drizo Gas/Glycol Dehydration Process

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Case Study

Case Study - IFPEXOL™ Offers Economic Advantages For Water And HC Dew Points Control

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Natural Gas
Case Study

Case Study - DRIZO® revamping of offshore TEG unit improves NGL recovery: THE EKOFISK CHALLENGE

Read more
Natural Gas
Case Study

Case Study - IFPEXOL™ Offers Economic Advantages For Water And HC Dew Points Control

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Technical article

Technical Article - Drizo® revamping of offshore TEG unit improves NGL recovery: the Ekofisk challenge

Read more
Technical article

Technical Article - Solving Aromatic and CO2 Emissions with the Drizo Gas/Glycol Dehydration Process

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Press release

Axens Celebrates the 10th Anniversary of AxSorb® and AxTrap™ Adsorbents

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Press release

Selection of Axens Axtrap 283® for the "Made in France" Exhibition organized at the Elysée Palace on July 3rd and 4th, 2021

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