Distillation coloumn separates different refinary products into its fractions according to their boiling points. A distillation coloumn has different chambers, and low boiling point fractions come into lower side of coloumn and higher boiling point fractions come into upper side of coloumn. It is constructed in increasing order of boiling points from below to upper side of coloumn.

bhushan

Aug 25th, 2012

If relative volatility is less than one why separation does not occur in distillation.

ketki chaudhary

Mar 3rd, 2013

Distillation column separates the liquid mixtures into their components. It has two sections the upper section is called rectifying section and lower one is called stripping section. The liquid having lower boiling point is obtained as a bottom product and the liquid of a higher boiling point obtained as a top product.

sekhar reddy

Apr 1st, 2013

the design of any distillation process involves in finding number of trays required for required separation,which is calculated by mc cabe method

Bhausaheb Gaikwad

Sep 27th, 2013

It is simply nothing but to find out no of stages required for given operation by keeping reflux ratio optimum i.e.by keeping Operating cost minimum.It also mean to find out column dia & ht,heat duties for re-boiler & condenser.

Chemical Engineering Galaxy on Facebook

May 10th, 2014

design of distillation column have the following steps...

1.specifying the feed and product specification.
2.choice of operating conditions like pressure or temp
3.choice of column whether it is packed or plate.
4.calculation of reflux ratio.
5.calculation of no of plates required or HETP.
6.design of tower internals.
7.mechanical design.

Rupesh mandloi

Jun 30th, 2014

design of distillation column job is very difficult to other work, in the designing of distillation column first find out vapour velocity ( vapour velocity V=1.2/(density of mixture)^0.5 then find molecular wt of gas and then find column dia. by D=0.0164(V)^0.5(Mol.wt of gas/molar density)^0.25

pavan satish

Sep 8th, 2015

If RV>1, you will see that large variation in vle curves, it shows that more volatile component going to vapour phase and less volatile component coming to liquid, this is our theme too.

If RV=1, more volatile component in vapour is equal to more volatile in liquid so separation difficult to occur.

If RV<1, more volatile component in liquid phase is richer, How can you get this? More volatile component should be more in vapour phase, as RV values increases more composition of more volatile component in vapour phase, so separation is easy.

jamal nizami

Nov 6th, 2015

Because it make an azeotrope, to break the azeotrope it is too difficult and not suitable as if you change the dynamics Bottoms will also go along Distillate. So in that situation we use Evaporation or Filtration techniques or other.

jamalnizami@hotmail.com

Nov 6th, 2015

Not any, Mcabe Theile is only used for Binary solution if more than that we can use Fenske or Other.

Ankit shah

Feb 9th, 2017

Precisely it contains mainly 11 steps as follows:
1. Decide the more volatile compound in case of binary distillation and select heavy key and light key components in case of multicomponent distillation.
2. The next step is to decide operationg pressure and accordingly find VLE data.
3. Fix the values of top and the bottom products( i.e. xD and xW)
4. Complete the material balance and find the flowrates of distillate and rasidue.
5. Find minimum reflux ratio (Rm) by any methods like McCabe and Thiele method.
6. Fix the value of R. Generally R=1.5 to 3Rm is taken.
7. Select the type of tower:packed tower or tray tower.
8. Find tower diameter and pressure drop across the tower.
9. Select MOCs of all parts.
10. Design of reboilers and condenser.
11. Mechanical design.
Thank You.

Sabina Teymurova

Jun 13th, 2017

For column design there are main 8 steps:
1.Complete Material balance
2.Determine temperature of top and bottoms produc
3.Define heavy and light keys,find average and relative volatilities with respect to heavy key
4.Find minimum number of stages using Fenske equation
5.Calculate minimum reflux ratio using First and Second Underwood equations
6.Calculate Actual number of stages using Gillilland correlation
7.Find feed plate location
8.Define Distribution of non-key components

Arul

Jan 26th, 2018

The lighter, lower boiling point components evaporate and travel up the column to form the top product and the heavier, higher boiling point components condense and travelling down the column to form the bottom product.

Nirav soni

Mar 30th, 2018

Distillation column is separate the two component Based on its volatility difference, lighter and low boiling point fluid got up side and higher and high boiling point fluid got in bottom as a product.

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