A process for the separation of a propylene-propane mixture to produce 99 mol% propylene and 95 mol%
Question:
A process for the separation of a propylene-propane mixture to produce 99 mol% propylene and 95 mol% propane is shown in figure. Because of the high product purities and the low relative volatility, 200 stages may be required. Assuming a tray efficiency of 100% and tray spacing of 24 inches, this will necessitate the two columns shown in series, because a single tower would be too tall. Assume a vapor distillate pressure of 280 psia, a pressure drop of 0.1 psi per tray, and a 2-psi drop through the condenser. The stage numbers and reflux ratio shown are only approximate. Determine the necessary reflux ratio for the stage numbers shown. Pay close attention to the determination of the proper feedstage location so as to avoid pinch or near-pinch conditions wherein several adjacent trays may not be accomplishinganything.
Step by Step Answer:
The calculations were made with the SCDS Column model Simultaneouscorrection method because of the s...View the full answer
