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Puregas is now part of Wärtsilä

Wärtsilä Biogas Solutions

Biogas upgrading and liquefaction

The unique Puregas biogas upgrading process recovers over 99.9% of the available methane contained in raw biogas, maximizing biomethane yields and customer revenues with very low operational costs. The biomethane is suitable for natural gas grid injection, or for liquefaction using the mini scale MR liquefaction process.

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Efficiency and environmental sustainability are two of the main pillars of Wärtsilä’s strategy for future energy use
Claudia Beumer Sales Manager, Gas Solutions

Biogas upgrading plant

The Puregas process recovers more than 99.9% of the biomethane present in the raw biogas. The plant separates the CO2 from the biogas by a process of chemical adsorption. The selective organic solvents used in this process are so efficient that the end product can contain more than 99% methane and is suitable for vehicle fuel or to be injected into the natural gas grid. As the final product is so pure there is often no requirement to enrich with propane.

Unlike other technologies the Puregas process is highly tolerant of changes to the raw gas composition resulting from changes in feedstocks.

Biogas Upgrading Plant

LNG/Bio-LNG Plants

LNG plants - Mixed Refrigerant Liquefaction


Wärtsilä offers the energy efficient Mixed Refrigerant (MR) liquefaction technology for low liquefaction capacities. Together with our fast track engineering model, this technology results in low investment costs and short manufacturing time.

Mixed Refrigerant Liquefaction
Reversed Brayton cycle liquefaction

LNG plants - Reversed Brayton cycle liquefaction


Wärtsilä’s larger liquefaction plants are easy to operate, reliable, and fully automated. They represent a low lifecycle cost solution in the small to medium size liquefaction capacity range.

On demand Webinar BioLNG
Wärtsilä offers a reliable and cost-effective technology that helps us to build the future of renewable gases.
Arne Jakobsen, Genaral Manager, Biogas Solutions


The time to act for a sustainable maritime...

Reetta Kaila, Technology & Development Manager, Renewable Gases, Wärtsilä Marine, says the journey towards...
19 May 2021
  • Twentyfour7. article

Biomethane is more than just hot air

Could methane provide the catalyst for a 100% renewable energy future? Biomethane is the new kid on the...
2 June 2020
  • Twentyfour7. article

Producing sustainable fuel from animal...

As companies around the world seek to transition to renewable energy, Wärtsilä has delivered a ground-breaking...
4 March 2020
  • Twentyfour7. article

Gassed up and ready to merge

With the acquisition of Puregas Solutions, Wärtsilä has a foothold in the burgeoning biomethane market...
11 September 2018
  • #GasBassador
  • Twentyfour7. article

Press releases

Download Case Study

Threemile Canyon Farms

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Tekniska verken
The plant will reduce CO2 levels by enabling the use of clean-burning LBG instead of fossil fuels
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Biokraft LBG
The system offers low operating costs and is energy efficient with a minimal environmental footprint
EGE Biogas reference
EGE Biogas
putting the region Oslo at the forefront of environmental innovation

Contact us

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Contact our 24/7 customer support at +47 815 48 500.

For SPARE PARTS, please e-mail us with the equipment serial number or the name of the installation at (Inert Gas Systems) (all other products)

For TECHNICAL SUPPORT & SERVICE, please email us with the equipment serial number or the name of the installation at

Equipment serial number is taken from the equipment nameplate and includes all letters and numbers as given on the equipment nameplate.

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