Phase behavior of (CO2 + H2) and (CO2 + N2) at temperatures between (218.15 and 303.15) K at pressures up to 15 MPa

Olivia Fandiño, J.P.Martin Trusler, David Vega-Maza

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Abstract

Vapor–liquid equilibrium data are reported for the binary systems (CO2 + H2) and (CO2 + N2) at temperatures between (218.15 and 303.15) K at pressures ranging from the vapor pressure of CO2 to approximately 15 MPa. These data were measured in a new analytical apparatus which is described in detail. The results are supported by a rigorous assessment of uncertainties and careful validation measurements. The new data help to resolve discrepancies between previous studies, especially for the (CO2 + H2) system. Experimental measurements of the three-phase solid–liquid–vapor locus are also reported for both binary systems.

The vapor–liquid equilibrium data are modeled with the Peng–Robinson (PR) equation of state with two binary interaction parameters: one, a linear function of inverse temperature, applied to the unlike term in the PR attractive-energy parameter; and the other, taken to be constant, applied to the unlike term in the PR co-volume parameter. This model is able to fit the experimental data in a satisfactory way except in the critical region. We also report alternative binary parameter sets optimized for improved performance at either temperatures below 243 K or temperatures above 273 K. A simple predictive model for the three-phase locus is also presented and compared with the experimental data.
Original languageEnglish
Pages (from-to)78-92
Number of pages15
JournalInternational journal of greenhouse gas control
Volume36
Early online date10 Mar 2015
DOIs
Publication statusPublished - May 2015

Bibliographical note

Acknowledgements
This work was carried out as part of the CCS Next Generation Capture Technology project, commissioned and funded by the Energy Technologies Institute. We are pleased to acknowledge support for this work provided by Costain Natural Resources. We also acknowledge the contribution of Dr Niall McGlashan to the modeling of experimental data.

Keywords

  • carbon capture
  • carbon dioxide
  • hydrogen
  • nitrogen
  • solid–vapor–liquid equilibrium
  • vapor–liquid equilibrium

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