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CO2Mix Phase Equlibrium Facility

CO2Mix Phase Equlibrium Facility

CCS requires accurate knowledge on CO2 properties

CO2Mix laboratory
CO2Mix laboratory

In order to reduce both construction and operational costs of CCS to a viable level, it is vital to know the properties of CO2.

The behavior of the CO2 mixture can change significantly in response to even very small amounts of impurities.

Thermodynamic properties of pure CO2 are reasonably well known. But there are significant knowledge gaps on properties of CO2 with impurities. Therefore we need accurate predictions that rely on trustworthy new experimental data.


Analytical method

  • Composition measurements of all fluid phases
  • Highly accurate (Generally ~< 0.1 % so far) gas chromatography


  • Range: - 60 to 150 °C
  • Combined accuracy, stability, and uniformity < 10mK


  • Range: 4 - 200 bar
  • Accuracy better than 0.10 %

Mixtures considered in design

  • Primarily designed for CO2-rich mixtures, but can also be used for many other fluids with phase equilibria in specified pressure and temperature range
  • Impurities in CO2:
    • Air gases, eg. O2, N2, Ar
    • Explosive gases, e.g.: CH4, H2
    • Water
    • Challenging components: CO, SO2, H2S or NOx

Unique capabilities

  • Advanced gravimetric setup for calibration mixtures enables very accurate analysis
  • Visual inspection using borescope while maintaining thermal stability
  • Bellows for pressure stabilization during sampling
  • Combination of bellows and borescope enables detailed study of e.g. critical point and freeze-out

Measurement examples

Our data are needed to correct or enable models.

Why CCS?

The purpose of CO2 capture and storage (CCS) is to minimize CO2 emissions and prevent large amounts of carbon dioxide (CO2) from being released into the atmosphere. SINTEF conducts research on the whole value chain for CCS.

SINTEF leads the national Centre for Environment-friendly Energy Research (FME) on CCS - NCCS