Propylene is produced by the dehydrogenation of propane. The product stream leaving a dehydrogenation reactor is found to contain 900 mol/s propane, 99.75 mol/s propylene, and 95 mol/s of H2. This stream is passed to a distillation column, with the distillate containing all of H2, most of propylene, and 0.555% of the molar flow rate of the propane that enters the column. The bottoms from the column, which is recycled back to the reactor, has a propylene molar flow rate equal to 5% of that in the distillate. The distillate is then passed to a second distillation column in which all of the H2 is recovered in the distillate and all of the organics (propane and propylene) are recovered in the bottoms. Perform a degree of freedom analysis for the system containing the two distillation columns (you do not need to worry about the dehydrogenation reactor).
Propylene is produced by the dehydrogenation of propane. The product stream leaving a
dehydrogenation reactor is found to contain 900 mol/s propane, 99.75 mol/s propylene, and
95 mol/s of H2. This stream is passed to a distillation column, with the distillate containing
all of H2, most of propylene, and 0.555% of the molar flow rate of the propane that enters the
column. The bottoms from the column, which is recycled back to the reactor, has a
propylene molar flow rate equal to 5% of that in the distillate. The distillate is then passed to
a second distillation column in which all of the H2 is recovered in the distillate and all of the
organics (propane and propylene) are recovered in the bottoms.
Perform a degree of freedom analysis for the system containing the two distillation
columns (you do not need to worry about the dehydrogenation reactor).
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