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More info about PROSERNAT

SPREX® & SPREX®CO2: Bulk Acid Gas Removal from Highly Sour Gas


SPREX® & SPREX®CO2 Bulk Removal

Cryogenic Bulk Removal & Solvent Acid Gas Removal Unit

Process Principle

  • Bulk H²S or CO² removal from highly sour gas by high pressure cryogenic distillation
  • Conventional distillation column with no hydrates or solid products formation
  • Separated acid gases are recovered liquid at high pressure and easily pumped back into reservoir
  • Final sweetening of partially treated gas may be done with a conventional amine unit

Key Benefits
– Economic alternatives for the development of highly sour gas reserves with acid gas reinjection
o Reduced capital cost and energy consumption versus conventional alternatives
o Limits sulphur production and/or CO² release to atmosphere
– Proprietary solid/liquid/vapor thermodynamic model, validated through lab data and demonstration plant operation
– Process design and robustness of operation validated through demonstration plant operation for more than 18 months

SPREX® is a joint development between IFP Energies nouvelles, TOTAL and PROSERNAT

SPREX®, Highly Sour Gas Sweetening with Acid Gas Injection

Process Scheme


SPREX® demonstration plant at TOTAL’s Lacq plant – 2.5 MMSCFD, 18-40% H²S, designed and built by PROSERNAT

Industrial Domain of Interest


  • H²S bulk removal from raw gas with over 25% H²S, with reinjection of liquid H²S
  • No upstream sour gas dehydration needed
  • 8 – 12% H²S in outlet gas to amine unit, @ -30 to -40°C in reflux drum
  • Energy saving "SPREX® + Amines" by 35% versus "Amines" process (@ 35% H²S in sour gas)


  • CO² bulk removal from raw gas with more than 35 – 40% CO², with reinjection of liquid CO²
  • Upstream gas dehydration required
  • 18 – 25% CO² in outlet gas, @ -50 /-55°C in reflux drum
  • Energy saving by 50% and CAPEX savings by 20% vs. 2 stages membrane (@ 70% CO² in sour gas)

Material Balance
power consumption ratio

Comparison SPREX®CO² vs. membranes for the treatment of NG with 70% CO²

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