Abstract
A normal alkylane model molecular-UNIFAC model for prediction of the vapor-liquid equilibrium of heavy oil is introduced in this paper. There is only one sort of main group in this model, and the types and numbers of subgroups in the narrow fractions can be determined only according to one property factor. The errors of vapor-liquid equilibrium of Daqing crude oil between experimental values and the ones calculated by this model are satisfactorily within engineering accuracy. The application field of this model in vapor-liquid equilibrium of heavy oil is expected for expansion in the future.
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