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Reading / References: Ch 7 [ Seader , Henley, & Roper ( SHR ) Textbook ] n - Octane / n - Decane Separations A
ReadingReferences: Ch Seader Henley, & Roper SHR Textbook
nOctane nDecane Separations
A saturated liquid feed of containing moleoctane is to be fractionated at kPa abs in order to form a distillate containing mole noctane and a bottoms product of mole octane. Assuming Raoult's Law behavior applies the associated vaporliquid equilibrium has been modeled provided below
The column is originally designed for a reflux ratio of :
a Calculate the flowrates of the distillate and bottoms.
b Determine the minimum reflux ratio, RMIN and the minimum number of theoretical trays at total reflux.
c Determine the theoretical number of trays and the feed tray number for the specified operational design.
d Determine the boilup rate vapor returned to column compared to bottoms flowrate
Reconsider the design if the feed enters with thermal value, and answer the following
e Determine the minimum reflux ratio, RMIN and the minimum number of theoretical trays at total reflux.
f Determine the theoretical number of trays and the feed tray number for the specified operational design.
g Determine the boilup rate vapor returned to column compared to bottoms flowrate
Now consider the following situation: Assume you start with the original design as specified by solutions in parts a through d above. The feed suddenly changes from the saturated liquid to a mixed vaporliquid condition with The number of trays determined for the original design determined in part c does not change, so
h If the boilup ratio does NOT change
i What distillate noctane mole fraction results?
ii Onto what plate does the feed enter?
i Now if the distillate reflux were to remain the same
i What bottoms mole fraction results?
ii Onto what plate does the feed enter?
j Discuss compare etc the results found in part h and iDiscussion question
tableVapor Pressure,
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