One method of producing propylene is the dehydrogenation of propane C3H8 to proplene C3H6 according to the reaction C3H8-->C3H6+H2 A schematic of the reaction is shown below. The fresh feed (Stream 1) has a total flow rate of 100. mol/min and is composed of 96 mol% propane and 4.0 mol% propylene. The single pass conversion of propane across the reactor is 40% and all of the hydrogen is separated in the flash drum. Stream 5 exiting the flash drum is fed to a distillation column where 90% of the propylene is separated. The product (Stream 6) exiting the distillation column is composed of 99 mol% propylene and 1.0 mol% propane. The second stream exiting the column (Stream 7) is recycled back into the process. a) Why is there no purge stream for this process? b) What is the overall conversion of propane? c) What is the molar flow rate of propane in Stream 2? d) What is the molar flow rate of propylene in Stream 7? e) What is the recycle to fresh feed ratio f) Suggest 2 possible reasons why the single pass conversion of propane is relatively low.
One method of producing propylene is the dehydrogenation of propane C3H8 to proplene C3H6 according to the reaction
C3H8-->C3H6+H2
A schematic of the reaction is shown below. The fresh feed (Stream 1) has a total flow rate of 100. mol/min and is composed of 96 mol% propane and 4.0 mol% propylene. The single pass conversion of propane across the reactor is 40% and all of the hydrogen is separated in the flash drum. Stream 5 exiting the flash drum is fed to
a distillation column where 90% of the propylene is separated. The product (Stream 6) exiting the distillation column is composed of 99 mol% propylene and 1.0 mol% propane. The second stream exiting the column (Stream 7) is recycled back into the process.
a) Why is there no purge stream for this process?
b) What is the overall conversion of propane?
c) What is the molar flow rate of propane in Stream 2?
d) What is the molar flow rate of propylene in Stream 7?
e) What is the recycle to fresh feed ratio
f) Suggest 2 possible reasons why the single pass conversion of propane is
relatively low.
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