A cubic equation of state is modified in such a way that prediction of PVT data from 40 model compounds, typical of coal oil, becomes possible with an absolute mean deviation of less than 2 % for saturated liquid volumes and vapour pressures > 1 bar. Additional correlations for binary interaction parameters are obtained by an optimization procedure using vapour-liquid equilibrium (VLE) data from known heavy hydrocarbon liquidhight gas systems. When the modified equation is applied to coal-derived liquids, only specific gravity and boiling analysis data of the coal liquids are required, primarily in order to determine the equation-of-state parameters. The proposed equation is shown to allow a good prediction of VLE data for systems consisting of wide-boilingrange coal oils and light gases. Experimental values were obtained at elevated temperatures and pressures with a circulation flow apparatus.

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chenspannung). Fur die Gemische muB diese Konstante experimentell gewonnen werden. Die Konstante ist unabhangig von der Gasleerrohrgeschwindigkeit und hangt lediglich von dem Stoffsystem und evtl. den KonstruktionsgroBen, wie von der Art des Gasverteilers usw., ab.

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