Direct measurement of hydrate equilibrium temperature in CO2 and CO2 rich fluids with low water content

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A high-pressure experimental setup was used to obtain experimental data on the hydrate equilibrium (melting) temperature (HET) of hydrates formed from low water content CO2 and CO2 rich mixtures. A novel method was used to measure hydrate formation temperature in addition to melting temperature directly at realistic temperature/pressure conditions encountered in transport by pipelines or ship. The method can be used to evaluate the likelihood of hydrate formation in pipelines/ships transporting pure CO2 and CO2 coming from capture processes as well as from high CO2 content produced gas. The data generated from the measurement can also be used to investigate the kinetics of hydrate formation and dissociation in low water content fluids at pipeline/ship conditions. This paper details the experimental equipment, methods, test fluids and results. Experimental results are compared against predictions of the simplified cubic plus association equation of state (sCPA-EoS) coupled with the van der Waals and Platteeuw solid solution theory.
Original languageEnglish
Article number114063
JournalFluid Phase Equilibria
Early online date27 Feb 2024
Publication statusPublished - Jun 2024


  • Carbon dioxide
  • Hydrate equilibrium temperature
  • Hydrates
  • Low water content
  • Modelling

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Chemical Engineering
  • Physical and Theoretical Chemistry


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