Question

a mixture of 65 mol % n hexane and 35 mole % n octane is fed to a flash drum operating at 1500 mm Hg. Feed rate is 100 gmol/s. Mixture is heated to 110 degrees celcius, which the mixture vaporizes. Vapor and liquid products are removed constantly,

A) Calculatae the vapor and liquid product compositions (Mol % n hexane and n octane)

B) Calculate the vapor and liquid flow rates (gmol/s) y hex = 0.7 x hex = 0.6

C) Calculate the fractional recovert of the less voltile octane in the liquid and the fraction recovery of the more volatile hexane in the vapor pressure?

Answer #1

A mixture of 35 mole% n-hexane (C6H14) and rest n-heptane
(C7H16) is fed to a flash drum operating at 1500 mmHg pressure. The
feed rate is 100 mol/s. The mixture is heated to 100C, and the
vapor and liquid are removed continuously. Assuming ideal
conditions, calculate vapor and liquid flow rates and
compositions.

A mixture of 35 mole% n-hexane (C6H14) and rest n-heptane
(C7H16) is fed to a flash drum operating at 1500 mmHg pressure. The
feed rate is 100 mol/s. The mixture is heated to 100C, and the
vapor and liquid are removed continuously. Assuming ideal
conditions, calculate vapor and liquid flow rates and
compositions.

Consider a flash drum operating at 69oC that is fed a
mixture of n-pentane, n-hexane and nheptane at compositions of
0.55, 0.25 and 0.20, respectively. The vapor pressures for these
compounds are 2.755, 1.021, and 0.39 bar, respectively at this
temperature. Determine the dew point pressure of this mixture and
the liquid composition.

A flash drum is to flash 10000 lb moles/hr of a feed that is 65
mole % n-hexane and 35 moles % n-octane at 1 atm pressure. V/F =
0.4. Find Tdrum, liquid composition, vapor composition. Use the K
values given in Table.
T/

A100 mol/h of feed mixture with 20% pentane, 25%
hexane, 30% heptane and 25% octane is to be distilled in a single
column to an overall distillate product that contains no more than
2 mol/h of heptane and the bottom product that contains a maximum
of 1.5 mol/h of hexane. Calculate the distillate and bottoms mole
fraction, XDi and XBi, for all other components.

Flash distilling liquid mixture containing 40 mol % A(LK) and 60
mol % B(HK)
The flow rate (F) of the mixture supplied to the drum is 100
mol/h.
a fraction (yA; unit) of A present in a (a) vapor phase obtained
under the following design conditions.
mol % and (b) the recovery rate of B at this time (the amount of B
obtained by liquid relative to the amount B present in the raw
material); but
Calculate the % above....

Consider a mixture of 30% n-butane, 35% n-hexane, 35% n-heptane.
If the pressure is 202 kPa, calculate the dew point temperature in
?C and the unknown mole fractions. Specify whether the unknown mole
fractions are vapor or liquid.

Consider a mixture of 30% n-butane, 35% n-hexane, 35%
n-heptane.
a. If the temperature is 40 ?C, calculate the bubble point
pressure in kPa and the unknown mole fractions. Specify whether the
unknown mole fractions are vapor or liquid.
b. If the temperature is 50 ?C, what is the dew point pressure
in kPa and what are the unknown mole fractions? Specify whether the
unknown mole fractions are vapor or liquid.

A gas stream contains 40 mol% n-hexane in nitrogen (N2) and
flows at 6600 L/min, 60◦C, and 1 atm from a soybean oil extraction
process. You are to use a condenser to liquefy and recover nhexane
to recycle back to the oil extraction process. The current process
specifications call for the condenser to operate at 15◦C. A liquid
condensate stream is produced that is in equilibrium with the
exiting gas stream.
(a) (15) Perform a degree-of-freedom (DoF) analysis to
demonstrate...

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