1/11
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced |
---|
No study sessions yet.
Mixer-settler inputs
Feed
Solvent
Mixer-settler outputs
Raffinate
Extract
Mass flow rates F, S, R and E are typically
Solute free
Raffinate
Carrier liquid after solute removal
F = R for a solute free basis
Extract
Solvent after absorbing solute
E = S for solute free basis
When is LLE used? (5)
Both components close to boiling
Components heat sensitive or flammable
Mixture forms azeotrope
Solution is dilute
One or both species involatile
Operating line slope for single stage unit
-F/S
Co-current cascade
Least efficient
Equilibrium reached after 1 stage, no further separation
Cross-current cascade
Each unit uses fresh feed of solvent S, split into N streams
Feed / raffinate on x-axis (‘crosses’ the fresh streams)
Cross-current operating line
Perform balance around nth unit
Slope -NF/S
Counter-current cascade
Most effective, similar to absorber + stripper
Counter-current cascade operating line
Balance nth unit
Slope +F/S