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Hydrocarbons often are classified by the bonds between the carbon atoms. Four important types include paraffins (or alkanes) having only single bonds, olefins (one or more double bonds), naphthenes (cycloalkanes), and aromatics (containing at least one benzene ring). These are commonly referred to collectively as PONA components.
PRO/II also supports several other component types. Petroleum components typically are discrete composite pseudo-components that exhibit the bulk properties of different types of hydrocarbons mixed in a continuous stream.Petroleum components may be defined on the PETROLEUM statement (Chapter 2), or derived from assay stream data (Chapter 32 of the PRO/II Keyword Manual). They are characterized by the program to generate pseudocomponent properties according to the methods described in this chapter.
Although the default characterization methods are suitable for most petroleum applications, the user has the flexibility to choose other methods, if desired.SYNCOMP and SYNLIQ components are modeling adjuncts of petroleum components. They are defined directly by supplying a basic set of property data, instead of determining them from assay analysis.
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