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Columm Pack
Introduction
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Colpack has over the years become generally
accepted as the most efficient packing for
distillation towers operating at reduced
pressure. Separation of heat sensitive,
close boiling fractions calls for many
theoretical stages and low pressure drop.
Colpack is the precise solution to this
problem |
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Construction
:
Colpack are fabricated by knitting bunched
fine wires of filaments (0.01mm) which is
further crimped and wound in to a roll of
the desired column diameter. Any material
which can be drawn into a fine wire or
filament can be used in the manufacture of
colpack. However, stainless steel 304 and
316 grades are readily stocked and other
higher alloys are available as per
requirement.
Installation
:
Colpacks are supplied as 150 mm high packing
of the same diameter as the nominal
bore of the column. Only the simplest
type of support is required, usually
two bars at right angles or in case of
large towers, parallel bars at six
inch are placed. |
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Packing are inserted into the top of each
section free from all internal projection
tower and pushed gently down to the support
grid. A disc of wood mounted on a pole
permits the packing to be pushed without
damage. Direction of their crimps going in
opposite direction to be inserted. |
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Salient Features :
1. Simply replacing random packing with
existing column you can upgrade existing
process with increased product quality,
higher production capacity and lower pressure drop.
2. Low bulk density of Colpack result in
decreasing the dead weight of the new packed
column systems, minimize structural
foundation, piping insulation and hence installation cost.
High efficiency of Colpack permits reduction
in column diameter.
3. The high voidage of Colpack allows free
flow of both liquid and vapor through the
packed column, resulting in low pressure
drop per unit height of the packing.
4. The high surface area of Colpack permits
intimate contact between vapor and liquid
resulting in low values of HETP (1780 sq.
mt /m3).
5. The low bulk density of Colpack result in
decreasing the dead weight of the column(432
kg /m3).
6. The HETP (height equivalent of a
theoretical plate) of Colpack is less than15
cm over the entire range of velocity.
7. Due to the capillary effect of
multifilament mesh of colpack wall effect is
almost completely eliminated. However for
column
height large than 3 to 4 meters an intermediate
redistributors is required if gas flow is
more.
8. The flooding velocity of Colpack is 2 to
2.5 times higher than those of conventional
packing. This depending upon the
requirement will reduce the column diameter or will increase
the throughput |
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Applications
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1. Vacuum distillation service where
pressure drop across the packed height is
critical, separation of close boiling points
components which require a very large number of theoretical
plates.
2. Where components are thermally unstable,
colpacks are indispensable.
3. Applications involving very low
superficial velocities(0.1cm/ sec)
4. In pollution control operations in
biological oxidation of liquid effluents.
5. In manufacture of various organic
compound
6. Colpacks supersede all the conventional
tower packing in their characteristic and
performance
7. Comparative technical data of colpacks |
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Sr. No. |
Packing Type |
Size (mm) |
Density (kg/m3) |
Surface Area |
Voidage % |
Pdts Mm of hg |
HETP (mm) |
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1 |
Colpack |
All |
432 |
1780 |
94.5 |
0.07 |
120 |
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2 |
Rasching ring
ceramic |
12.5 |
804 |
410 |
64 |
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3 |
Rasching ring
metal |
25 |
641 |
190 |
73 |
0.53 |
290 |
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4 |
Berl saddles
(ceramic) |
25 |
722 |
253 |
69 |
--- |
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5 |
Intolox sadles
ceramics |
12.5 |
545 |
260 |
78 |
0.13 |
230 |
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6 |
Intolox sadles
metals |
25 |
545 |
260 |
77.5 |
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Wire Mist Eliminators
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Vane Mist Eliminators
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Columm Pack
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Flame Arrestors
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Domestic Scrubbers
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Knitted Wire Mesh
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Structure Pack PTFE
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Knitted Mesh Filter
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Hexagonal Wire
Nettings |
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