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Gas Sweetening

Contaminants like CO₂, H₂S, Mercaptans and COS are often found in natural gas. The removal of these impurities is critical not only because they are responsible for toxicity, corrosion, and freezing issues, but also in order to meet transport, sales gas and liquefaction specifications and comply with environmental regulations.
Gas Sweetening

Axens Offer

Axens’ gas sweetening technologies rely on a unique and long-term cooperation between a recognized licensor, Axens; an innovative R&D center, IFP Energies Nouvelles; and TOTAL, a world-leading operator with more than 60 years of gas sweetening experience.

Axens’ portfolio through HySWEET™ and AdvAmine™ processes provides tailor-made solutions for the removal of natural gas contaminants, meeting the strictest environmental regulations and market specifications while minimizing capital expenditure and operating costs.

The deep dehydration and purification of gas & liquid streams from Natural Gas processing may require fixed bed operation of regenerable adsorbents depending on the required specifications. In some cases, the removal of heavy metals and of sulfur compounds is performed using fixed bed operation of non-regenerable adsorbents also referred to as guard beds. Axens offers tailor-made solutions for both on-shore and off-shore facilities.

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.

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Consulting, Studies & Audits

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

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Unit Revamps & Retrofits

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

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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.

Read more

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.

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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.

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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.

Read more

Consulting, Studies & Audits

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

Read more

Unit Revamps & Retrofits

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

Read more

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.

Read more

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.

Read more

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.

Read more

Consulting, Studies & Audits

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

Read more

Unit Revamps & Retrofits

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

Read more

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.

Read more

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.

Read more

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.

Read more

Consulting, Studies & Audits

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

Read more

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.

Read more

HySWEET™

HySWEET™ has been developed based on the selection of the most suitable physical solvent for blending with a variety of amines (DEA, MDEA, formulated MDEA).

It enables to maximize mercaptan removal together with the absorption of the acidic species while minimizing the usual drawback of hybrid solvents: an increased hydrocarbon co-adsorption potentially harmful for the downstream Claus unit, treating the recovered acid gas stream.

Low Hydrocarbon co-absorption < 1% vol. no impact on SRU operation
High energy efficiency up to 15% savings on reboiling energy
Easy retrofit by simple addition of the physical compound to an existing amine solvent inventory without modification of existing equipment and without impact on existing downstream SRU unit
Commercial Bulletin
Related Offer
Modular Unit
hysweet

AdvAmine™

AdvAmine™ solutions rely on a unique and long-term cooperation between:

  • TotalEnergies, the initial developer of the AdvAmine™ technology portfolio
  • IFP Energies nouvelles, an innovative R&I center
  • Axens, a recognized licensor.

The Advamine™ series of processes, designed to be suitable for all applications: gas plants, LNG plants, refineries, shale gas, syngas, etc.., enables to treat any type of feed gas composition and to achieve the most stringent specifications. Process configurations are adapted to operator specific cases with tailor-made solvent composition formulation, using open market chemicals in order to reduce solvent costs.

Over 200 licensed units with a total cumulative capacity of 34,000 MMSCFD
Implemented in 25 countries
Significant solvent cost savings
Document - AdvAmine™
Document - AdvAmine™ for Syngas
Related Offer
Modular Unit
Advamine

SPREX®

SPREX® is a process developed for bulk H2S removal from highly sour gas. SPREX® offers economic alternatives for the development of highly sour gas reserves with acid gas reinjection, which allows CAPEX and energy consumption reduction and limits sulfur production.

SPREX® has been developed to meet the challenges of the development of very sour (> 10% acid gases) natural gases.

The process principle is as follow: highly sour gases are split in a cryogenic distillation, producing partially sweetened gas at the overhead and liquid acid gas mixture at the bottom, which is suitable for reinjection.

Bulk H2S removal from highly sour gas by high-pressure cryogenic distillation
Capital cost and energy consumption reduction
Limitation of sulfur production
Related Offer
Modular Unit

COSWEET™

COSWEET™ is a process for carbonyl sulfide (COS) removal from sour natural gas streams associated with amine-based sweetening processes that allow for the simultaneous removal of COS, H2S and/or CO2.

By combining amine absorption with catalytic COS hydrolysis, COSWEET™ allows gas sweetening, either total (removal of both H2S & CO2) or selective (removal of H2S mainly), with complete COS removal. This process is applicable to any type of absorption solvent.

The natural stream to be treated is sent to the acid gas removal unit (AGRU), where H2S and/or CO2 are removed by the amine solvent. COS is then decomposed into CO2 and H2S on the COSWEET™ reactor, using an Axens proprietary catalyst. Different options can be foreseen for H2S polishing:

  • Gas is contacted in an amine absorber with the regenerated solvent from AGRU to achieve the required treated gas specifications in the outlet stream, or
  • Gas is sent to a polishing reactor filled with Axens AxTrap™ catalyst for complete H2S removal in the outlet stream.
Up to 99%+ COS conversion
COS destruction integrated with any type of absortion solvent
COSWEET™ combined with AdvAmine™ allows CAPEX and OPEX savings as compared with an amine process allowing identical COS removal
Related Offer
Modular Unit
cosweet
Catalysts

Sweetening Catalysts

For the sweetening of liquid hydrocarbons Axens offers catalysts using sulfonated cobalt phthalocyanine as the active material.

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Adsorbents

Purification Series Adsorbents

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

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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.

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Stay Ahead

Upcoming Events

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Conference
La Hague, Netherlands - CEST
3 days
Speakers
Qiao Zhao
Technology Engineer, Technology & Technical Support Business Division Low Carbon Solutions and Gas
Jonathan LI
Technology engineer • TTS - Dehydration & Purification
Anouck L'HERMITTE
Technology Engineer • TTS - Dehydration & Purification
+1
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GPA EUROPE 2025

The Gas Processors Association Europe (GPAE) Annual Conference 2025 will be held from June 4 to 6 at The Hague Marriott Hotel in the Netherlands. This event will feature a workshop on gas purification for cryogenic processes, a technical conference with presentations on topics such as CO₂ infrastructure, green hydrogen, and ammonia, and a dedicated training day for young professionals. Attendees can also participate in networking events, including a welcome reception and conference dinner. Early registration is encouraged to take advantage of discounts
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Resources

Technical article

Technical Article - Improving hybrid-solvent formilations for energy effiency and optimal gas treating

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Technical article

Technical Article - Mercaptans removal: How to simplify the overall has plant design and operation with HySWEET®?

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Technical article

Technical Article - Mitigating corrosion in sweet gas units: a comparison between laboratory data and field survey

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Technical article

Technical Article - Corrosion control on amine plants allows compact unit design with high acid gas loadings

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More resources
Insight

Modules: the Solution for a Successful Offshore Natural Gas Project

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See all Insights
Technical article

Technical Article - Mercaptans removal: How to simplify the overall has plant design and operation with HySWEET®?

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Technical article

Technical Article - Improving hybrid-solvent formilations for energy effiency and optimal gas treating

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Technical article

Technical Article - Cos Removal from natural gases by absorption in ALKANOLAMINE solutions

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Technical article

Technical Article - Solutions for the treatment of highly sour gases

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FAQ

Solids in the feed are causing corrosion and erosion problems in our amine system. How do we remove them effectively and economically?

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Press release

Axens to provide technologies for the complete gas treatment chain at CSV Albright Sour Gas Processing Plant in Canada

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Press release

Axens HySWEET™ Technology selected by SPETCO International Petroleum Co. Kuwait and Jereh for the acid Gas Removal Units of two new Gas Treatment plants in Kuwait

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