Measurement of Water Solubility Limits of CO₂ Mixtures to Underpin the Safe Pipeline Transportation of CO₂

Monitoring the composition of mixtures which are of relevance to Carbon Capture and Storage pipelines is of high importance for the safe transportation of CO₂ during the CCS process. Captured CO₂ will contain varying amounts of impurities such as N₂, H₂, O2 and H₂O. These are components which greatly affect the phase behaviour of the captured CO₂. Being able to quantifiably monitor the composition and components of CCS-relevant mixtures is key for (i) safety; (ii) determining standard operating conditions.

This project, incorporating several novel techniques, have been used to measure:

• The phase behaviour and thermodynamic properties of CO₂ containing varying amounts of impurities in order to improve or validate existing models of CCS relevant gas mixtures.
• The solubility of water in impure CO₂ CCS mixtures.

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