Products
Alumina Deactivation Protocols
Introduction
Dynamic
Adsorbents, Inc. aluminas are unique products; e.g., Super I, Std Act I,
etc: High activity alumina can be used for polar samples in nonpolar
solvents, and for the purification of solvents. Lower activities of alumina can readily be obtained by the addition of polar media,
especially water. Thus, each problem can be resolved via the adjustment
of the sorption system, as required for each problem.
Special Features
Super I
aluminas show an approximate double capacity as
compared to Activity I. Super I does not have to be deactivated in
steps. By following the appropriate deactivation curves,
deactivation can be achieved in minute increments.
Deactivation
behavior by the following procedures makes it relatively easy to
obtain the desired activity.
Deactivation Behavior
By following the procedures below, it is relatively easy to obtain the
desired activity.
Deactivation
Behavior - Alumina
Activity Grade
|
|
Alumina Type |
Super I |
I |
II |
III |
IV |
V |
|
Super I -
A,B,N |
0 |
1 |
4 |
7 |
10 |
19% Water
Added |
|
Std Act I -
A,B,N |
na |
0 |
3 |
6 |
10 |
15% Water
Added |
|
A = Acid, B
= Basic, N = Neutral |
|
|
|
|
|
|
Deactivation
Procedure(s)
The % water addition shown above are
based upon weight / weight relationships; these relationships are
critical and any deviation will/could result in obtaining improper
activities.
To reproducively obtain the desired
activity, weigh an appropriate amount of alumina into a stoppered glass
bottle. Add the appropriate weight of water to the alumina and close the
bottle. For example, 97 g of alumina + 3 g H20 = 3% water addition.
Shake well until all lumps disappear.
Wait until the mixture has cooled to room temperature. Keep the
container closed so that equilibrium conditions remain constant.
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