Liquid composition data may be used to improve the initial estimate for highly non-ideal distillation columns. These data are seldom needed for refinery columns.
Usage
From the Column Main Window, push the Initial Estimate button.
From the Column Initial Estimates Window, push the Liquid Composition button.
Enter the estimated component liquid mole fractions for desired trays in the table provided. Tray numbers are entered in the top row of the table. Components are selected using the drop-down lists and liquid mole fractions are entered in horizontal rows, under the tray numbers. See Editing Tabular Data for further explanation of tabular data entry and editing.
For VLLE systems, estimates supplied in this window apply to the bulk liquid for columns with two liquid phases. Composition estimates may be entered for the individual liquid phases in the Initial Liquid 1 / Liquid 2 Mole Fraction Profile Window which is opened by pressing the Individual Phases button.
Additional Information
If you wish you can override all or part of the estimate data provided by the initial estimate generation method. Liquid mole fraction data are determined by linear interpolation for trays that are bracketed by estimates.
It is good practice to supply compositions at several trays over the range of the column for highly non-ideal applications. Minimum suggested locations are the condenser, feed tray, and reboiler.
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