The CApure process recovers more than 99.9% of the biomethane present in the raw biogas. The process separates the CO2 from the biogas by a process of chemical absorption. The selective organic solvents (Amine) 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. Siloxane removal is extremely efficient with contents of less than 0.05 mg/Nm3, which is the lowest detectable level for today’s instruments.

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

Protecting our Environment


CApure technology achieves the highest methane recovery, reducing methane slip to below 0.1%. There is no additional cost or energy requirement associated with treating the tail gas and harmful emissions to the environment are avoided.

The long life, biodegradable organic solvents used in the CApure process are not susceptible to changes in gas composition and form part of a closed-loop system where water consumption is kept to a minimum.

99.9% methane recovery

  • Greatest life cycle profit
  • Lowest operational cost
  • Local service support
  • 24/7 remote monitoring
  • CO2 revenue stream
  • The greenest process
  • Integrated Solution


The CApure biogas upgrading process is completely odour-free. The sulphur in the foul smelling raw biogas passes through an active carbon filter where it is separated from the biogas and becomes chemically bound to the carbon. The carbon bed is changed when it is saturated with sulphur. For safety reasons an odourant is added to the completely odour-free CApure methane.


Our Global Network

Puregas Solutions AB

Torsåsgatan 3A
392 39 Kalmar
Tel: +46 (0) 480 77 00 00

Puregas Solutions Ltd

Enterprise Park East
Sunderland SR5 2TA
Tel: +44 (0) 191 516 6662

Puregas Solutions GmbH

Deichstrasse 1
20 459 Hamburg
Tel: +49 (0) 160 906 629 51

Puregas Solutions AS

Birkemose Allé 39
6000 Kolding
Tel: +46 (0) 7016 44 312

Wärtsilä North America Inc

117101 N. Gessner Rd,
Suite A, Houston,
TX 77064,

Tel: +1 281 233 6200

Wärtsilä Gas Solutions

Solbraavn 10
1383 Asker
Tel. +47 81 54 85 00