Phase Behavior of Light Gases in Hydrocarbon and Aqueous Solvents.

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Under previous support from the Department of Energy, an experimental facility has been established and operated to measure valuable vapor-liquid equilibrium data for systems of interest in the production and processing of coal fluids. To facilitate the development and testing of models for prediction of the phase behavior for such systems, we have acquired substantial amounts of data on the equilibrium phase compositions for binary mixtures of heavy hydrocarbon solvents with a variety of supercritical solutes, including hydrogen, methane, ethane, carbon monoxide, and carbon dioxide. The present project focuses on measuring the phase behavior of light gases and water in ... continued below

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27 p.

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Gasem, K.A.M.; Robinson, R.L., Jr.; Gao, W. & Ratzalff, D.W. October 1, 1997.

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Description

Under previous support from the Department of Energy, an experimental facility has been established and operated to measure valuable vapor-liquid equilibrium data for systems of interest in the production and processing of coal fluids. To facilitate the development and testing of models for prediction of the phase behavior for such systems, we have acquired substantial amounts of data on the equilibrium phase compositions for binary mixtures of heavy hydrocarbon solvents with a variety of supercritical solutes, including hydrogen, methane, ethane, carbon monoxide, and carbon dioxide. The present project focuses on measuring the phase behavior of light gases and water in Fischer-Tropsch (F-T) type solvents at conditions encountered in indirect liquefaction processes and evaluating and developing theoretically-based correlating frameworks to predict the phase behavior of such systems. Specific goals of the proposed work include (a) developing a state-of-the-art experimental facility to permit highly accurate measurements of equilibrium phase compositions (solubilities) of challenging F-T systems, (b) measuring these properties for systematically-selected binary, ternary and molten F-T wax mixtures to provide critically needed input data for correlation development, (c) developing and testing models suitable for describing the phase behavior of such mixtures, and (d) presenting the modeling results in generalized, practical formats suitable for use in process engineering calculations. During the present reporting period, the solubility of carbon monoxide, hydrogen, and nitrogen in n-dodecane were measured using a static equilibrium cell over the temperature range from 344.3 to 410.9 K and pressures to 13.2 MPa. The uncertainty in these new solubility measurements is estimated to be less than 0.001 in mole fraction. The data were analyzed using the Peng-Robinson (PR) equation of state (EOS). In general, the PR EOS represents the experimental data well when two interaction parameters (Cij and Dij) are used for each isotherm. The data suggest that the EOS interaction parameters are highly temperature dependent for the carbon monoxide and hydrogen systems and less so for the nitrogen system. Also a trend of increasing solubility with increased temperature and pressure is observed. A manuscript we have prepared for publication is attached which provides detailed technical information.

Physical Description

27 p.

Notes

OSTI as DE98050353

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  • Other Information: PBD: [1997]

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  • Other: DE98050353
  • Report No.: DOE/PC/96209--T1
  • Grant Number: FG22-96PC96209
  • DOI: 10.2172/643567 | External Link
  • Office of Scientific & Technical Information Report Number: 643567
  • Archival Resource Key: ark:/67531/metadc692451

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Creation Date

  • October 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Nov. 10, 2015, 9:16 p.m.

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Gasem, K.A.M.; Robinson, R.L., Jr.; Gao, W. & Ratzalff, D.W. Phase Behavior of Light Gases in Hydrocarbon and Aqueous Solvents., report, October 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc692451/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.