High-pressure phase studies on fluid mixtures of low-volatile organic substances with supercritical carbon dioxide |
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Authors: | R Konrad I Swaid GM Schneider |
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Institution: | Department of Chemistry, University of Bochum, 4630 Bochum, Federal Republic of Germany |
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Abstract: | Two high-pressure phase equilibrium cells working according to the analytical method in the temperature range 300 to 450 K and up to 200 MPa have been developed. In the first cell p,T,x,y equilibrium data can be determined by sampling and GC analysis. With this cell the gas-liquid phase behaviour of the ternary systems carbon dioxide + tridecane + hexadecane and carbon dioxide + tridecane + 1-hexadecanol were determined at 423.4 K and between 8 and 35 MPa. For the second apparatus a spectroscopic high-pressure cell fitted with two pairs of sapphire windows was developed. Molar absorptivities are obtained from calibration runs in the homogeneous region. Gasliquid phase equilibria in the system decane + CO2 were investigated from 342.8 to 400.2 K and between 10 and 20 MPa; here absorption data were measured in the NIR region. |
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