Oxygen Trap Regeneration
by
Professor Jun Wu
(Laboratory of Joseph W. Stucki,
1.
Close the valve between the O2
trap and the O2 indicating trap in the N2 line.
2.
Take off the O2 trap from the N2
line and close its both ends with trap caps.
3.
Close the N2 input valve before
the O2 trap in the N2 line.
4.
Insert the expired O2 trap in
the regeneration line.
5.
Install a 200 oC
thermometer on wall of the O2 trap.
6.
Plug the electric heating strip of the O2
trap to the transformer socket.
7.
Purge the O2 trap with dry N2
from the compressed N2 cylinder with a flow rate of
50 cc/min.
8.
Open the outlet valve on the end of the
regeneration line. The outlet tube should be inserted into hood.
9.
Turn the transformer power on and adjust
the heating temperature to 130 oC by
increasing the output voltage of the transformer.
10.
Heat the O2 trap under this
condition for 15 min.
11.
After that, adjust the temperature to 150 oC by increasing further the output voltage of
the transformer.
12.
Switch the purging gas from N2 to
10 % H2 + 90 % Argon and adjust the flow rate at
350 cc/min.
13.
Heat the O2 trap under this
condition for 4 hours.
14.
Turn off the power switch on the
transformer.
15.
Close the outlet valve on the end of the
regeneration line.
16.
Let the O2 trap
cool down under H2 pressure.
17.
When the temperature of the O2
trap reached the room temperature, disconnect the output end of the O2
trap quickly under H2
pressure and close it with a trap cap immediately.
18.
Disconnect the other end of the O2
trap from the regeneration line and close it with the 2nd trap cap
immediately, close the inlet valve of the 10 % H2 + 90 % Argon
purging gas.
19.
Close the 10 % H2 + 90 % Argon
cylinder valve.
20.
Tighten the caps on the both ends of the O2
trap and now it is ready to use in the N2 line.
Voltages Used
for Regenerating the O2 Traps
(Data from regeneration practice in 1995-2002)
|
Label of O2 Trap |
Relative Size |
|
|
|
For 130 oC |
For 150 oC |
||
|
# A |
Middle |
~ 41 – 44 V |
~ 46 – 49 V |
|
# B |
Long |
~ 50 – 54 V |
~ 55 – 58 V |
|
# C |
Short |
~ 36 – 38 V |
~ 40 – 42 V |
|
# D |
Short |
~ 52 – 54 V |
~ 57 – 59 V |
|
# E |
Short |
~ 45 – 48 V |
~ 50 – 54 V |
|
# F |
Long |
~ 53 – 55 V |
~ 57 – 60 V |
|
# G |
Cylinder |
~ 34 – 36 V |
~ 40 – 42 V |