Question

A continuous, steady-state distillation column with a total condenser and a partial reboiler is separating methanol from water at one atmosphere. The feed rate is 100 kg mole per hour. The feed is 55 mole % methanol and 45 mole % water. We desire a distillate product that is 90 mole % methanol and a bottoms product that is 5 mole % methanol. Assume CMO.

a- Obtain and use the vapor liquid equilibrium data for methanol –water form any available recourse

b- If the external reflux ratio L/D = 1.25 plot the top operating line.

c- If the boilup ratio V/B = 2.0 plot the bottom operating line.

d- Step off stages starting at the bottom with the partial reboiler. Use the optimum feed stage. Report the optimum feed stage and the total number of stages.

e- Plot the feed line. Calculate its slope. Calculate q. What type of feed is this?

Answer #1

A distillation column with a total
condenser is separating acetone from ethanol. A distillate
concentration of xD = 0.90 mole fraction acetone is desired. Since
CMO is valid, L/V = constant. If L/V is equal to 0.8. The
distillation column has a partial reboiler that acts as an
equilibrium contact. If the bottoms composition is xB =
0.13 mole fraction acetone and the boilup ratio V/B= 1.0, find the
vapor composition leaving the second stage above the partial
reboiler.
a)...

Separation of Acetone and Ethanol
A distillation column with a total condenser and partial
reboiler is separating acetone and ethanol (equilibrium data is
provided in the table below). The feed is 70 mole% acetone, flows
at 1000 mol/h, and is a superheated vapor for which one mole of
liquid must be vaporized on the feed plate to cool four moles of
feed. We desire a bottoms composition of 5 mole% acetone and a
distillate composition of 90 mole% acetone. The...

We wish to separate a mixture of 60 mol% ethanol and 40 mol%
n-propanol in a distillation column with a partial
reboiler and a total condenser. The feed rate is 1000 kmol/h, and
feed is a saturated vapour. We desire a distillate product of 99
mol% ethanol and a bottoms product that is 0.8 mol% ethanol. Reflux
is saturated liquid and CMO can be used. Equilibrium data can be
approximated with an average relative volatility of 2.1 (ethanol is
more...

Q1) Methanol (50 %) and water (50 %) mixture is fed into a
distillation column. The feed
flowrate is 500 kmole/hr. 50 % of feed is vaporized. The column is
well insulated and has a
total condenser. A reflux is set to 2 and returned to column as
saturated liquid. The compositions
in the distillate and bottom are to be 95 % and 5 %, respectively.
The column is at 1 atm. Instead
of a reboiler, saturated steam is directly...

Consider the distillation of a saturated liquid feed of 0.16 mol
fraction methanol and 0.84 mol fraction water. The column has a
side stream of composition 0.5 mol fraction methanol and a flow
rate of 7.7% of the feed rate. The top product is to contain 0.77
mol fraction methanol and the bottom product is to contain 0.02 mol
fraction methanol. The column operates at 1 atm, and the usual
simplifying assumptions can be made. The external reflux ratio is...

Fifty mol% methanol in water at 101 kPa is continuously
distilled in a seven-plate, perforated-tray column, with a total
condenser and a partial reboiler heated by steam. Normally 100
kmol/h of feed is introduced on the third plate from the bottom.
The overhead product contains 90 mol% methanol, and the bottoms 5
mol%. One mole of reflux is returned for each mole of overhead
product. Recently it has been impossible to maintain the product
purity in spite of an increase...

1. The liquid product
from a flash distillation has a mole fraction of the more volatile
component that is lower than the specified liquid purity. Should we
decrease, increase, or hold constant the vapor molar flowrate to
meet the specified liquid purity? Draw a sketch and explain
why?
2. If the
reflux ratio increases, do the molar flowrates for the distillate,
bottoms, reflux, and overhead vapor decrease, stay the same, or
increase? Support your answer.
3)1000 kmol/h of feed with...

11. Your company has a distillation column ready to install. The
column has one feed, a
partial condenser and a partial reboiler. Vapor product is drawn
directly from the condenser.
Find the number of degrees of freedom with this column. HINT there
is no stream divider
after the condenser.
12. Using a total condenser with a reflux ratio of 2, the heat load
on the condenser is
(a) Twice the heat of vaporization of the distillate.
(b) Equal to the...

FULL SOLUTION PLEASE
Fifty mol% methanol in water at 101 kPa is continuously
distilled in a seven-plate, perforated-tray column, with a total
condenser and a partial reboiler heated by steam. Normally 100
kmol/h of feed is introduced on the third plate from the bottom.
The overhead product contains 90 mol% methanol, and the bottoms 5
mol%. One mole of reflux is returned for each mole of overhead
product. Recently it has been impossible to maintain the product
purity in spite...

It is desired to design a distillation column to
separate Methanol and Ethanol. One must obtain 100 kmol / hr of
distillate with a mol concentration of 0.95 from a liquid stream
saturated with 35 mol% of methanol. For this purpose, there will be
a Reboiler and a total capacitor that can eliminate 12000 Kcal / h
(λ = 40Kcal / Kmol), and allows a return flow of saturated reflux
to the tower. If the concentration of bottom product should...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 22 minutes ago

asked 22 minutes ago

asked 29 minutes ago

asked 31 minutes ago

asked 32 minutes ago

asked 37 minutes ago

asked 44 minutes ago

asked 45 minutes ago

asked 58 minutes ago

asked 1 hour ago

asked 1 hour ago