These are the two shortcut models in PRO/II. Both treat the separation of a feed into a group of products as a series of one feed-two product columns.
The CONVENTIONAL model assumes that the series of interlinked two product columns are connected by reflux. This model is most useful for column design and analysis of columns with one feed and two products because for this configuration if the light and heavy keys are specified, many additional calculations will be performed such as minimum reflux, feed tray location, reboiler duty, condenser duty, and the reflux vs. trays curve.
The REFINE model assumes that there is no reflux between the individual column sections. This is a good assumption for refinery multi-draw columns with total or nearly total liquid draws.
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