Molecular
sieve is a sodium aluminosilicate. It has a fixed pore size
according to the material specified, a 4 Angstrom pore size
being the most common.
(1 Angstrom - 3.94 x 10-9 inches)
Because of its high comparative cost, it is normally used
for special process applications. Pressure dew points to
-100°F may be achieved with molecular sieve depending
on the dryer design and operating conditions.
Physical
Properties |
Molecular
Sieve Package Sizes |
|
|
|
|
| Color
and form |
Off
white / tan bead |
33-0317 |
5
lb pail |
| Bulk
Density |
49
lbs/cu.ft. |
33-0249 |
25
lb pail |
| Surface
area |
3.67
x 10 6 sq ft/lb |
33-0265 |
50
lb bag |
| |
|
33-0250 |
330
lb Steel drum |
| Static
adsorption |
|
|
| Humidity |
|
| 100%
RH |
23.0% |
| 90%
RH |
22.5% |
| 60%
RH |
21.0% |
| 10%
RH |
19.0% |
1.
Uniform retention capacity
Moisture retention (pounds of water adsorbed per pound of
desiccant) does not change appreciably if the air or gas
is not saturated. It also keeps its moisture retention properties
over a wider range of operating temperatures.
2. Round bead shape
Round shape has high abrasion resistance and results in
lower pressure drop than extruded molecular sieve.
