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DETERMINATION OF THE SOLUBILITY PARAMETERS OF A C9+ CONDENSATE OIL FRACTION BY INVERSE GAS CHROMATOGRAPHY

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Author(s): N. E. Moustafa

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 49;
Issue: 3;
Start page: 22;
Date: 2007;
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Keywords: Inverse Gas Chromatography | Solubility Parameter | Condensate Oil | Flory-Huggins interaction Parameter

ABSTRACT
The solubility parameter of a C9+ condensate oil fraction, δ2, was determined by the technique of inverse gas chromatography (IGC). Using this oil fraction as the stationary phase, solute retention volumes were precisely determined as a function of temperature using 20 solute probes of varying solubility parameter. Solvent (oil)-solute Flory-Huggins interaction parameters, χ1,2∞, were also calculated from the solute retention data and indicate complete miscibility of the solute probes with the examined oil fraction at conditions of infinite dilution. The χ1,2∞ values and their dependence on temperature were used to compute δ2 at 100, 90 and 80 °C. Over this temperature interval,δ2, decreases from 10.1695 to 9.6322 (cal./cm3 )1/2 with increasing temperature, a trend consistent with the loss of cohesional energy density in the liquid condensate oil.
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