Component Slate Flexibility

V4 grants you significantly greater freedom over the component slate you adopt, letting you increase or reduce the number of pure and hypo components to suit your modeling requirements. Naphtha component information remains preserved either way.

V4 Synthesis works on the assumption that component compositions are more accurate than TBPCUT or Distillations and will always respect component data at the expense of other information. You can specify the composition of any component in your system to synthesis and it is no longer restricted to a fixed set. As an example, suppose you specify a value for MCP (Methyl Cyclo Pentane) of 3 lv% on crude. If MCP appears in your flowsheet component slate, the yield of that component will be set to 3 lv%. If not, it will be allocated to the nearest boiling hypocomponent.

Naphtha components work in terms of group compounds, where synthesis understands the relationship between a group like C6 iso-paraffins and its individual isomers. You can specify either or both and we recommend you provide as much detail as you can. Specifying both a group yield and individual yields serves two purposes: it allows for compatibility with V3 and allows you to handle situations where you know some of a group's content but not all.

Naphtha and all other pure components are carried as properties of the assay where each component allocates to a single flowsheet component that will either be itself where the component is also a component in the flowsheet or will be the nearest boiling hypo. Naphtha components no longer smear across multiple hypo components.

V3 handled naphtha modification as the final step of producing an assay, wholesale replacing the composition and key properties of the naphtha region TBP Cuts. V4 takes a different approach, considering the naphtha information early in the process as soon as the basic TBP and Density syntheses have been performed. This should lead to less property distortions.