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## 3.5. Recommended Plus Fraction Characterization Procedure

1. Use α = 1 and calculate the mole fraction of each SCN group using Eq. (3.27). The plus fraction is extended into 45 SCN groups. Specify the upper molecular weight boundary using the midpoint method.
2. Assign the molecular weight for each SCN group from Table 3.9. In some cases it is better to calculate the molecular weight of each SCN group using Eq. (3.28).
3. Calculate the mole fraction and molecular weight of the C45+ fraction using the following equations:

$zC45+=zC7+−∑n=744zCn$

(3.87)

$MWC45+=zC7+MWC7+−∑C7C44zCnMWCnzC45+$

(3.88)

4. Assume a constant Watson characterization factor. Determine ...

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