Mean average boiling point

To extend the applicability of the characterization factor to the complex mixtures of hydrocarbons found in petroleum fractions, it was necessary to introduce the concept of a mean average boiling point temperature to a petroleum cut. This is calculated from the distillation curves, either ASTM or TBP. The volume average boiling point (VABP) is derived from the cut point temperatures for 10, 20, 50, 80 or 90% for the sample in question. In the above formula, VABP replaces the boiling point for the pure component. 

For undefined hydrocarbon mixtures, the liquid density may be predicted at any temperature (T) from the mean average boiling point (MeABP) and the specific gravity (sp gr) by Eq. (2-94), adopted from Ritter et al. ... 

This critical pressure Pc method is a curve fit of the API Fig. 4D4.1 [17]. Rather than just one curve-fit equation, however, the reader will soon realize there are seven curve-fit equations, code lines 4520 through 4580. Also, please realize that the mean average boiling point of each pseudocomponent is first calculated in code lines 3370 through... 

Figure 4 Schematic of correlation between mean average boiling point and volumetric average boiling point (Maxwell)...

Description Heats of vaporization (60 to 180 Btu/lb) vs. mean average boiling point... 

Boiling-point basis Mean average boiling point. 

By custom, either the mid vapor temperature of the fraction or the mid-point of a gas chromatographic distillation of the fraction can be used for the mean average boiling point. In either case the method must be spedfied. 

Using the 50% point of the TBP, estimate the Watson factor (K ). Set the 50% TBP temperature as an initial guess for the mean-average boiling point (MeABP) (see also Section 1.5). 

Use densities and mole weights to calculate volume-, cubic-, molar- and mean-average boiling point of the total fraction [55]. 

MeABP Mean average boiling point temperature, R... 

Assume that Watson K factor is constant throughout the entire boiling range and calculate the mean-average boiling point (MeABP). We develop a spreadsheet tool (see Sections 1.2 and 1.5) to perform the iteration of estimating MeABP based on the method presented by Bollas et al. [36]... 

Rate constant for thermal hydrocracking of naphtha to gases, gx icmsfc 1h Mean average boiling point, R Metals content in the feed... 

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