The things given : Distillatio

The things given : Distillation tower, reflux is present,1atm, The feedstock is a liquid at the bubble point, XF= 0.5,XD=0.98
XB is not given.
In this case, is XB = 0.02 ?
Then, why?



No! you can not take XB = 0.02

  • XF is the mole/wt fraction of more volatilecomponent in the feed stream.
  • XD is the mole/wt fraction of more volatilecomponetn in the distillate.
  • XB is the mole/wt fraction of more volatilecomponent in the bottom stream.

XD = 0.98 means 98 % of Distllate contains molevolatile component and rest 2 % other component. (if it is binarydistillation)

Assume basis: per unit time.

For example, if the distllate (D) is 80 mol and XD =98 mol %. Then the amount of more volatile component in thedistillate will be

  • = (Xd x D)
  • = 0.98 x 80 mol
  • = 78.4 mol

The other component will be 2 mol %. i., the amount of othercomponent in the distillate will be

  • = 0.02 x D
  • = 0.02 x 80 mol
  • = 1.6 mol

Note: This 0.02 mol fraction or 1.6 mol refers to thecomposition in the distillate not in the bottomstream.

XB refers to composition in bottom stream. Tocalculate the amount of XB one shoud know the value ofB.

To find unkonwn values. These two material balances veryimportant.

Overallmaterial balance:

Feed = Distillate + Bottoms

F = D + B

Overallcomponent balance:


You can even take material balance over the top of columncontaining Vapor stream (V) , Distillate (D) and some portion ofdistillate fed back to the column in liquid form (L).

V = L + D

Reflex ration R = L/D

Then, the above equation can further be modified to

V = (R+1)D

If you still have any doubt feel free to ask me.

"Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!"

Calculate your order
Pages (275 words)
Standard price: $0.00
Client Reviews
Our Guarantees
100% Confidentiality
Information about customers is confidential and never disclosed to third parties.
Original Writing
We complete all papers from scratch. You can get a plagiarism report.
Timely Delivery
No missed deadlines – 97% of assignments are completed in time.
Money Back
If you're confident that a writer didn't follow your order details, ask for a refund.

Calculate the price of your order

You will get a personal manager and a discount.
We'll send you the first draft for approval by at
Total price:
Power up Your Academic Success with the
Team of Professionals. We’ve Got Your Back.
Power up Your Study Success with Experts We’ve Got Your Back.