Experimental phase behavior study of a five-component model gas condensate

In this work, the bubble points and dew points of a multicomponent mixture of methane, butane, heptane, decane and tetradecane as a model mixture representative of a gas condensate, have been measured experimentally. Ten samples with approximately the same composition were prepared and their bubble-point and/or their dew-point pressures were measured at several temperatures. The phase-behavior measurements were carried out in the temperature range of 240–410 K, and at pressures up to 21.6 MPa. The temperature and pressure ranges of the critical point for this system was measured and the cricondenbar and cricondentherm of the phase envelope were determined. The Peng–Robinson equation of state (PR EOS) was used for modeling of the phase behavior of this system. The PR EOS was able to successfully determine the bubble- and dew-points of this model gas condensate. Using the PR EOS, the retrograde region and liquid drop out characteristic of this model gas condensate were determined.