Issues regarding VMGsim’s calculation of material density

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The naphtha components were simulated using actual boiling point distillation curves, and the density of the oil was calculated to be 739. A material balance equation was established to relate these simulated components; when 20°C and 101 KPa were applied, a density of 731 was obtained. However, the result analyzed by our factory’s central laboratory was 715. What is the problem? The calculation results from different versions are similar. By using the method of full-component analysis to input the components of the oil, a density of 821 was obtained at 20°C and 101 kPa. There are slight differences between the results produced by different versions; the more advanced versions yield values that are closer to those obtained by the central laboratory, which is 807. This is undoubtedly the result of a more complete set of physical property data