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ByAsmaa Saeed MohamedAmal Mohamed hussien
Esraa Zakria Kamel
Alexandria UniversityFaculty of Engineering
Liquid-liquid Extraction is a mass transfer
operation (Diffusion Controlled Operations) in
which the feed is contacted with an immiscible
or partially immiscible solvent that exhibits
preferential affinity towards one or more of the
components in the feed (called the solute).
• the feed is called the raffinate
stream after it begins to
lose the solute.
• the solvent is called
the extract stream when
it leaves the contactor.
LLEProcess
Feed
Solvent
Extract
Raffinate
A sketch of the basic process
1. Agitated column.2. Rotating shaft.3. Rotating disc.4. Stator ring.5. Liquid distributor.6. Variable speed motor.7. Light phase storage
tank.8. Heavy phase storage
tank.9. Centrifugal pump.10.Control valve.
The volumetric mass transfer coefficient (K` = KA) of the
extraction of copper sulphate from water with naphthenic acid
in a recirculating batch rotating disc contactor was obtained
using the equation: CCV
KA
dt
dCe
s
tV
KA
CC
CC
se
eo
ln
CC
CC
e
eo
ln
which upon integration yields:
K` is determined by plotting vs. t.
K` (cm3/sec) is used instead of K (cm/sec) as the interfacial mass transfer area between the two phases could not be calculated.