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  • 1
    Electronic Resource
    Electronic Resource
    Semiautomated PVT facility for fluids and fluid mixtures (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 817-821 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A manually operated Burnett apparatus has been converted into a semiautomated Burnett–isochoric PVT facility. An automated pressure injector with dedicated control logic nulls a sensitive differential pressure indicator. A microcomputer is used in setting the control temperature, monitoring equilibration, measuring temperature and pressure, processing the raw data, and storing the information. The quality of the apparatus is demonstrated by means of a low-density and a high-density isochore obtained for a geothermal working fluid mixture in one-phase, two-phase, and supercritical regimes, including a dew and a bubble point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139638
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of isobutane in the critical region (1983)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 28 (1983), S. 354-362 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je00034a004
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Modeling the thermodynamic properties of sodium chloride in steam through extended corresponding states (1988)
    Springer
    International journal of thermophysics 9 (1988), S. 649-661 
    Details
    ISSN: 1572-9567
    Keywords: critical line ; coexistence curve ; Helmholtz free energy ; molar heat capacity ; molar volume ; sodium chloride solution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent precise data on anomalous behavior of apparent molar properties of electrolyte solutions in near-critical steam have raised important questions as to how the thermodynamic properties of these systems should be described. Current Gibbs free energy models fail for highly compressible solutions. Here, a Helmholtz free energy formulation is presented as a first step in modeling compressible dilute aqueous electrolyte solutions. Comparisons are made with the known critical line, coexistence curves, apparent molar volumes, and heat capacities of NaCl in steam, and conclusions presented on improving the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503233
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A universal representation of the thermodynamic properties of fluids in the critical region (1984)
    Springer
    International journal of thermophysics 5 (1984), S. 195-208 
    Details
    ISSN: 1572-9567
    Keywords: critical-point universality ; critical region ; equation of state ; ethylene ; isobutane ; scaling laws ; steam ; thermodynamic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract To characterize the behavior of the thermodynamic properties of systems near a critical point, systems are grouped into universality classes. Systems within a universality class have the same universal critical exponents and scaling functions. Specifically, fluids are expected to belong to the universality class of three-dimensional Ising-like systems for which the universal quantities have been calculated with considerable accuracy. A scaled fundamental equation is presented which incorporates these theoretical predictions. Results obtained for various technologically important fluids, namely ordinary steam, heavy steam, ethylene, and isobutane, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00505500
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodynamic behavior of supercritical fluid mixtures (1986)
    Springer
    International journal of thermophysics 7 (1986), S. 231-243 
    Details
    ISSN: 1572-9567
    Keywords: aqueous electrolyte solutions decorated lattice gas ; partial molar properties ; power-law behavior ; supercritical extraction ; supercritical fluid mixtures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The recent surge of interest in supercritical extraction has brought the unusual properties of supercritical mixtures into the focus of attention. We discuss some of the properties of binary mixtures in a range around the gas-liquid critical line from the point of view of supercritical solubility. The general thermodynamic relationships that govern the enhancement of supercritical solubility are readily derived by a mathematical method introduced by Ehrenfest. The enhancement is governed by a strong divergence centered at a critical end point. We give the classical and nonclassical power-law behavior of the solubility along the experimental paths of constant temperature or pressure. The factor multiplying the strong divergence contains the partial molar volume or enthalpy of the solute in the supercritical phase. These partials are quite anomalous, especially if the mole fraction of the solute is small. They diverge at the solvent's critical point. We cite experimental evidence of these divergences, especially the results of recent experiments in dilute near-critical salt solutions. The anomalies found in these salt solutions are common to all dilute near-critical mixtures with a nonvolatile second component. We show that on experimentally convenient paths the solubility in a binary liquid mixture near its consolute points is not strongly enhanced. Finally, we sketch a nonclassical model based on the decorated lattice gas that can be used to describe supercritical solubility enhancement at low solubility, with the pure solvent used as a reference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500151
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