Actual number trays, plates, stages

Gas absorption can be carried out in a column equipped with sieve trays or other types of plates normally used for distillation. A column with trays is sometimes chosen instead of a packed column to avoid the problem of liquid distribution in a large diameter tower and to decrease the uncertainty in scaleup. The number of theoretical stages is determined by stepping off plates on a y-x diagram, and the number of actual stages is then calculated using an average plate efficiency. The plate and local efficiencies are defined in the same way as for distillation [Eqs. 

X 10 Btu/h. Above the feed, the flow rate varies between 283 and 344 lb mol/h, and below it, the flow rate varies between 2998 and 3097 lb mol/h. While DSTWU assumes the same number of moles on each plate or tray, RadFrac calculates what actually occurs. To see the flow rates on each stage, choose the block, then Profiles. 

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