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3
Specifications and characteristics
3.1
Principles of column function
Axial compression
Packing of AxiChrom 50, 70 and 100 is achieved by internal hydraulic axial compression
(Figure 3.1).
A
B
C
D
Packing liquid
forced out
Packing liquid
forced out
Packing liquid
forced out
Adap
te
r reaches
consolidated bed
Co
mp
re
ssi
o
n
of
bed according to
Packing Factor
Check valve
prevents
backflow
Hy
dra
ul
ic
chambe
r inlet
Hydraulic
liqu
id driv
es adapter down
Co
nso
lid
ated
bed
Slurry
Figure 3.1: Principle of internal hydraulic axial compression. (A) Hydraulic liquid pushes
the adapter down. Packing liquid is forced out of the slurry. (B) The slurry forms a consoli-
dated bed. (C) The adapter reaches the surface of the consolidated bed. (D) The bed is
compressed to a predetermined packing factor.
Axial compression is achieved by driving the adapter downwards in the column tube by
pumping hydraulic liquid, typically 20% v/v ethanol or 0.01 M NaOH, into the space be-
tween the top plate and the top of the adapter. This space is referred to as the hydraulic
chamber. The space between the bottom bed support and the top bed support is the
process chamber into which a slurry of medium has been poured. As the adapter moves
downwards in the column, packing liquid is forced from the slurry through an outlet in
AxiChrom 50, 70 and 100 columns Operating instructions 28-9331-08 AG
17
3 Specifications and characteristics