# 5 - Example Acetone vapor is considered toxic to the...

This preview shows pages 1–7. Sign up to view the full content.

Example Acetone vapor is considered toxic to the environment. As an engineer in the chemical plant, you are asked to design an acetone recovery system having the flow sheet illustrated in the next page. To make the calculation simpler, all concentrations of both gases and liquids are in presented in weight (mass) percent (normally, for gas phase, the concentration is presented in “volume” and “mole” basis) Calculate the values of A , F , W , B , and D in kg per hour, if given G = 1,400 kg/h

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Absorber column Distillation Column Condenser Water (100%) W kg/h Air A kg/h Air 99%) Water 0.5% Feed G kg/h Acetone 3.0 % Air 95.0% Water 2.9 % F kg/h Acetone 19.0 % Water 81.0% Bottom B kg/h Acetone 4.0 % Water 96.0% Distillate D kg/h Acetone 99.0 % Water 1.0%
Basis: 1 h of operation Hence, from the basis, G = 1,400 kg , and the “ Feed ” stream contains Acetone: 3.0/100 x (1,400) = 42 kg Air: 95.0/100 x (1,400) = 1,330 kg Water: 2.0/100 x (1,400) = 28 kg

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Consider the I unit – Absorber column Water (100%) W kg/h Feed G kg/h Acetone 3.0 % Air 95.0% Water 2.9 % Air A kg/h Air 99%) Water 0.5% F kg/h Acetone19.0 % Water 81.0% Absorber Column
G + W = A + F 1,400 + W = A + F xF x 100 19 1400 100 0 . 3 = Acetone balance Performing a species balance for acetone yields (y a0 ) (G) = ( y af ) (F) Over all balance F = 221.1 kg Air Balance (ya0) (G) = ( yaf ) (F) xA x 100 5 . 99 1400 100 0 . 95 = A = 1,336.7 kg

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Substituting the values of F and A in overall equation 1400 + W = 1336.7 + 221.1 W = 157.8 kg Balance around Absorber unit are W = 157.8 kg A = 1336.7 kg F = 221.1 kg Still D and B are unknown ?????
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 06/06/2011 for the course CHEM 3040 taught by Professor Reddy during the Spring '10 term at Taylor's.

### Page1 / 22

5 - Example Acetone vapor is considered toxic to the...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online