1

Liquid membranes

Liquid membranes

• Liquid Membranes

Possible
configuration
for LM.

Emulsion liquid Mem.

Organic liquid + surfactant (membrane)

Receiving phase

Aqueous phase

Porous

Support

Organic liquid impregnated

into the pores

SLM

Membrane Technology

Membrane contactors

F

w

S

Sb

R

Sw

R

F

R

S

S

Sw,

c

S

c

F

c

F

Sw,

c

FS

c

Feed

Solvent

F

S

w

S

Fiber

wall

MBSE (Extraction)

Membrane based processes

w

S

R

Sb

R

Sw

R

R

R

S

R

c

SR

c

S

Sw,

c

S

c

Sw

R

R

Stripping

solution

S

Solvent

w

S

Fiber

wall

MBSS (Stripping)

S.Schlosser, Permea 2005

Fresh stripping

solution

Loaded stripping solution

Extractor

(MBSE)

Stripper

(MBSS)

Feed

F1

F1

, c

V

&

R1

R1

, c

V

&

R2

R2

, c

V

&

Raffinate

F2

F2

, c

V

&

S1

S1

, c

V

&

Solvent

circuit

S2

S2

, c

V

&

Extraction of valuable organics

S.Schlosser, Permea 2005

2

Bioreactor with separation unit

S.Schlosser, J.Martak, R.Keresz, SepPurTechnol, 41(2005)237

• Liquid Membranes

Facilitated Transport in Liquid Membrane.

Liquid Membrane

M

+

B

MB

B: selective carrier

M: selectively separated

M

M

B

M

B

N

P

O

Ag

+

O

O

O

O

O

O

diphenyl-18-crown-6

O

O

O

O

O

O

Ag

+

Membrane Technology

• Liquid Membranes

- ELM: low practical interest

- SLM: lab scale and few applications restricted
high added value compounds.

- Hydrophobic Membranes (PE, PP ...).
- Hollow fibers.

- Potential applications:

• Selective removal and concentration of cations in solution.

• Selective separation of gases.

• Recovery of acid or basic compounds.

• Organic compound separation in complex mixtures.

Membrane Technology