On the water content in CO2 + CH4 and CO2-rich mixtures: experimental and modelling evaluation at temperatures from 233.15 to 288.15 K and pressures up to 15 MPa

Valderio Cavalcanti Filho, Antonin Chapoy, Rhoderick William Burgass

Research output: Contribution to journalArticle

Abstract

An experimental and modelling investigation of water content in CO2+CH4 and CO2-rich mixtures in equilibrium with hydrates or liquid water was carried out at temperatures between 233.15 and 288.15 K at pressures up to 15 MPa. Some measurements were undertaken in two-phase region, in the presence of hydrates, with liquid and vapour compositions also reported. Predictions from cubic-plus association SRK, SRK incorporating NRTL with Huron-Vidal mixing rules and multiparametric EoS-CG/GERG equations of state were compared with experimental data. In comparison with pure carbon dioxide, the addition of small amounts of impurities (permanent gases and/or hydrocarbons) resulted in a significant reduction in the water content of the fluid phases present. Overall, sCPA showed good agreement with experimental data, although SRK-HV-NRTL gave better results for some cases, despite the use of only two adjustable parameters. By contrast, multiparametric EoS-CG yielded poor representation of the experimental data. In the two-phase region, no matter the equation of state used, a tendency to underestimate water content in the liquid phase was observed.
Original languageEnglish
Article number103654
JournalJournal of Natural Gas Science and Engineering
Volume84
Early online date8 Oct 2020
DOIs
Publication statusPublished - Dec 2020

Keywords

  • CO +CH
  • CO -Rich mixtures
  • EoS-CG
  • SRK+HV+NRTL
  • Water content
  • sCPA

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

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