The CO2-H2O system: III. A new experimental method for determining liquid-vapor equilibria at high subcritical temperatures

J. G. Blencoe; M. T. Naney; L. M. Anovitz

doi:10.2138/am-2001-8-918

The CO₂-H₂O system: III. A new experimental method for determining liquid-vapor equilibria at high subcritical temperatures

J. G. Blencoe, M. T. Naney, L. M. Anovitz

Geochemistry & Interfacial Science

Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

A highly precise and accurate vibrating U-tube technique was developed to determine the upper baric stabilities of liquid-vapor assemblages in the CO₂-H₂O system at high subcritical temperatures (∼275-360°C). The first step is to create an isobaric-isothermal, physically isolated and chemically homogeneous sample of "high-pressure" CO₂-H₂O fluid of known composition. Fluid pressure (P) is then lowered slowly at constant temperature. Pressure readings and matching values for τ (the period of vibration of the U-tube) are recorded at 0.1 or 0.2 MPa + 36intervals. When the fluid begins to separate into two phases (liquid + vapor), a distinct inflection is observed in the trend of P vs. τ. Performing such experiments for fluid compositions at 0.05 mole fraction CO₂ (X_co2) intervals in the range 0.0 5 ≤ X_co2 ≤ 0.40 at 300°C produced a complete high-P liquid-vapor boundary curve for the CO₂-H₂O system at that temperature. Agreement with corresponding curves determined in previous studies ranges from poor to excellent.

Original language	English
Pages (from-to)	1100-1111
Number of pages	12
Journal	American Mineralogist
Volume	86
Issue number	9
DOIs	https://doi.org/10.2138/am-2001-8-918
State	Published - 2001

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abstract = "A highly precise and accurate vibrating U-tube technique was developed to determine the upper baric stabilities of liquid-vapor assemblages in the CO2-H2O system at high subcritical temperatures (∼275-360°C). The first step is to create an isobaric-isothermal, physically isolated and chemically homogeneous sample of {"}high-pressure{"} CO2-H2O fluid of known composition. Fluid pressure (P) is then lowered slowly at constant temperature. Pressure readings and matching values for τ (the period of vibration of the U-tube) are recorded at 0.1 or 0.2 MPa + 36intervals. When the fluid begins to separate into two phases (liquid + vapor), a distinct inflection is observed in the trend of P vs. τ. Performing such experiments for fluid compositions at 0.05 mole fraction CO2 (Xco2) intervals in the range 0.0 5 ≤ Xco2 ≤ 0.40 at 300°C produced a complete high-P liquid-vapor boundary curve for the CO2-H2O system at that temperature. Agreement with corresponding curves determined in previous studies ranges from poor to excellent.",

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AU - Anovitz, L. M.

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AB - A highly precise and accurate vibrating U-tube technique was developed to determine the upper baric stabilities of liquid-vapor assemblages in the CO2-H2O system at high subcritical temperatures (∼275-360°C). The first step is to create an isobaric-isothermal, physically isolated and chemically homogeneous sample of "high-pressure" CO2-H2O fluid of known composition. Fluid pressure (P) is then lowered slowly at constant temperature. Pressure readings and matching values for τ (the period of vibration of the U-tube) are recorded at 0.1 or 0.2 MPa + 36intervals. When the fluid begins to separate into two phases (liquid + vapor), a distinct inflection is observed in the trend of P vs. τ. Performing such experiments for fluid compositions at 0.05 mole fraction CO2 (Xco2) intervals in the range 0.0 5 ≤ Xco2 ≤ 0.40 at 300°C produced a complete high-P liquid-vapor boundary curve for the CO2-H2O system at that temperature. Agreement with corresponding curves determined in previous studies ranges from poor to excellent.

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The CO₂-H₂O system: III. A new experimental method for determining liquid-vapor equilibria at high subcritical temperatures

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