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    Wyświetlanie 1-3 z 3
    Tytuł:
    A review on physicochemical measurements by headspace gas chromatography. Studies of vapour-liquid equilibria.
    Autorzy:
    Lewandowski, Andrzej
    Szymczyk, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/764138.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    headspace gas chromatography, vapour-liquid equilibrium, vapour pressure
    Opis:
    Headspace gas chromatography (HS-GC) is a powerful technique for the analysis of volatile compounds. It has found broad applications for quantitative and qualitative analyses of various samples as well as for physicochemical measurements. This paper briefly reviews the basic physicochemical applications of HS-GC including vapour pressure measurements and studies of vapour-liquid equilibria in multicomponent systems. A special attention is paid to methodological aspects of these measurements. The advantages and limitations of HS-GC in this field as well as typical applications are also pointed out.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2017, 72, 2
    2083-358X
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the quintic equation of the state based model for the calculations of different thermodynamic properties
    Autorzy:
    Kozioł, A.
    Wiśniewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778661.pdf
    Data publikacji:
    2008
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    równanie stanu
    równowaga para-ciecz
    wielomiany Hermita
    NBP equation of state
    vapour-liquid equilibrium
    cubic Hermite polynomials
    Opis:
    Different thermodynamic properties (the vapour density, the liquid density and the saturation pressure) were calculated by the model based on the Nakamura-Breedveld-Prausnitz equation of state (NBP EOS). Since the original form of the NBP EOS often generates inaccurate results for liquids, it was modified to describe this phase better. The calculations were realized in the subcritical region. So far, the temperature-dependent NBP EOS parameters have been obtained by special correlations. Their constants were fitted to a lot of experimental data. In this paper the equation of state temperature-dependent parameters were obtained by a new method which was based at piecewise cubic Hermite interpolating polynomials (PCHIPs). In the proposed method some experimental data (called the key ones) were used, thus reducing the experimental effort. Seven substances were chosen for the test calculations. Each of them is common in industry. The calculation results were compared with the experimental data. The new method has made an accurate description of vapour-liquid equilibrium for the considered pure substances over a wide temperature range possible.
    Źródło:
    Polish Journal of Chemical Technology; 2008, 10, 1; 6-10
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Gas Solubility in Ionic Liquids Using the Cosmo-Sac Model
    Autorzy:
    Jaschik, M.
    Piech, D.
    Warmuziński, K.
    Jaschik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/184942.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vapour-liquid equilibrium
    ionic liquids
    Henry’s constant
    solubility
    carbon dioxide
    capture
    COSMO-SAC model
    równowaga par i cieczy
    ciecze jonowe
    Stała Henry'ego
    rozpuszczalność
    dwutlenek węgla
    Model COSMO-SAC
    Opis:
    Thermodynamic principles for the dissolution of gases in ionic liquids (ILs) and the COSMO-SAC model are presented. Extensive experimental data of Henry’s law constants for CO2, N2 and O2 in ionic liquids at temperatures of 280-363 K are compared with numerical predictions to evaluate the accuracy of the COSMO-SAC model. It is found that Henry’s law constants for CO2 are predicted with an average relative deviation of 13%. Both numerical predictions and experimental data reveal that the solubility of carbon dioxide in ILs increases with an increase in the molar mass of ionic liquids, and is visibly more affected by the anion than by the cation. The calculations also show that the highest solubilities are obtained for [Tf2N]ˉ. Thus, the model can be regarded as a useful tool for the screening of ILs that offer the most favourable CO2 solubilities. The predictions of the COSMOSAC model for N2 and O2 in ILs differ from the pertinent experimental data. In its present form the COSMO-SAC model is not suitable for the estimation of N2 and O2 solubilities in ionic liquids.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 1; 19-30
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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