PRO/II-Unit Operations Reference Manual

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The selection of components cannot be over-emphasized for such studies. While minimization of component numbers is desirable for simulation cost reduction, sufficient components must be included to enable accurate simulation.

In particular, for case a), the yields predicted can be greatly influenced by the components chosen. For case b), it is a relatively simple matter to adjust the components used as required to more accurately predict product properties. For case a), this a more complex task with judgment necessarily applied in light of the simulation requirements. The standard cuts used by PRO/II have been developed for crude unit simulation and will give good results. It is generally recommended that compromises to the standard cuts be made in the heavier components (above 800 F) where possible.