Question

Rectification. McCabe-Thiele Method. A mixture of benzene-toluene is to be distilled in a fractionating tower at 101.3 kPa. The column is fed 120 kg mol /h of a saturated liquid at the boiling point with 60 mol % benzene and 40 mol % toluene. The content of the distillate is 92 mol % benzene, and of the bottoms 5 mol % benzene. The reflux ratio is 3:1.

(a) Calculate the kg mol/h distillate: D=_______

(b) Calculate the kg mol/h bottoms: W=_______

(c) Attach the plot with the equilibrium line, 45? degree line, q-line, enriching and stripping operating lines, and stepping off the trays. Show with the dashed lines the stepping off assuming the Murphree tray efficiency is 0.5.

(d) Identify the position of the feed (the tray number) and inidicate the relative position of the feed to the tray: feed from bottom, from top, or both from top and from bottom.

Feed on tray _______from ___________

(e) Determine graphically the theoretical number of trays:

N= __________plus a reboiler

(f) Determine graphically the actual number of trays for the case of Murphree efficiency

0.5:

N= ____________plus a reboiler

(g) Calculate the overall tray efficiency in case of 0.5 Murphree tray efficiency: E0 =____________

(h) Attach the plot with the equilibrium line, 45? degree line, q-line, and enriching and

stripping operating lines for the case of minimum reflux ratio.

(i) Identify the point of intersection of the enriching operating line and q-line for the case of minimum reflux ratio:

x= ______ y=______

(j) Find minimum reflux ratio:

Rm=__________

Attach the plot with the equilibrium line, and enriching and stripping operating lines, and stepping off the trays for the case of total reflux.

Determine graphically the minimum number of theoretical trays at total reflux: N= ______________plus a reboiler

Answer #1

A liq mixture of benzene-toluene is to be distilled in a
fractionating tower at 101.3 kPa pressure. The feed of 100 kg mol/h
is liq and it contains 45 mole % benzene and 55 mole % toluene and
enters at 327.6 K (130 ◦F). A distillate containing 95
mole % benzene and 5 mole % toluene and a bottoms containing 10
mole % benzene and 90 mole % toluene are to be obtained. The reflux
ratio is 4:1. The average...

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feed has a boiling point of 95 °C. Calculate flow rates of
distillate and bottom product . determine the number of ideal trays
needed for the separation . Where is the feed tray...

Q1. A mixture of toluene and benzene is
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equilibria data provided in the table below. The required top
product composition contains 95 mol% of benzene, and the bottom
product composition contains 10 mol% of benzene. A feed consisting
of 40 mol% benzene and 60 mol% toluene at its boiling point is fed
to the column.
Thermodynamic data: VLE data for Benzene &
Toluene
x
0
0.058
0.155
0.256
0.376
0.508...

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(1). (5%) If one wants to increase
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____________.
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FULL SOLUTION PLEASE
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