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Vapor-liquid equilibrium of coal derived fluids by continuous thermodynamics.

机译：连续热力学对煤成液的汽液平衡。

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Coal derived liquids consist of mostly aromatic compounds with definite amounts of elements like carbon, hydrogen, sulphur, nitrogen, and oxygen. A continuous thermodynamic model for vapor --liquid equilibria of these liquids has been developed. Characterization of coal fluids has been done in terms of functional groups, the composition of which may be determined from experimental elemental analysis, and spectroscopic data. The continuous thermodynamic framework has been used to represent different fractions by continuous distributions with molecular weight as the characterizing property. To perform vapor-liquid equilibrium calculations each distribution is represented by a definite number of quadrature points, and a model which incorporates Virial coefficients method for the vapor phase and the UNIFAC group contribution method for the liquid phase has been used. The main work involves a parametric study to determine if one averaged distribution can represent coal fluids with fair degree of accuracy. For this purpose, bubble point, dew point calculations are carried out for the same coal liquid represented first by a single averaged distribution and then by two and more distributions. Phase equilibrium properties have also been calculated for some available experimental data. 30 refs., 16 figs., 42 tabs.

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