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  • Phase equilibrium (solid-liquid-gas) in polyethyleneglycol-carbon dioxide systems
    Weidner, Eckhard ...
    Phase equilibria (solid-liquid-gas) for polyethyleneglycol (with molar masses 1500, 4000, 8000 and 35000 g mol -1) and carbon dioxide mixtures were determined. It was found that the S-L-V lines in ... P-T projection for all polyethyleneglycols studied show a temperature minimum and a temperature maximum. These phenomena have not been reported previously in literature. If a reduced temeperature (obtained by dividing the temperature of the solid-liquid transition under pressure by the melting point of PEG at 1 bar) is introduced, the S-L transition of all binary systems is represented by one line. The solubility of CO2 in liquid polyethyleneglycols is influenced by pressure and temperature, and is almost independent of the molecular mass of polyethyleneglycol. In the P-T projection, the vapour liquid equilibrium is represented by a straight line if isopleths are plotted as a function of the reduced temperature. By combining the P-T red projections of the S-L and L-V transitions, one master diagram can be obtained which is valid for all binary mixtures of polyethyleneglycol and CO2 in the pressure and temperature range investigated.
    Vir: The Journal of supercritical fluids. - ISSN 0896-8446 (Vol. 10, No. 3, 1997, str. 139-147)
    Vrsta gradiva - članek, sestavni del
    Leto - 1997
    Jezik - angleški
    COBISS.SI-ID - 3051030

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