BJ68 - 31-1-2013 at 05:02
Preparation of LOX with a cold trap and Liquid Nitrogen:
Equipment used:
Cold Trap with PTFE cock and ground glass joints
Dewars
Three-way stopcock
Air balloon
Silicone tubing
Pressure reducer for Oxygen
Stative and Clamps
Chemicals:
Oxygen in gas zylinder (5 L volume and 200 bar)
Liquid Nitrogen
Preparation:
Connect the pressure reducer to the oxygen cylinder and go with a silicon tubing from the low pressure outlet to the empty cold trap. Fix the ground
glass joint connections with clamps in a way that they can tolerate a little pressure. From the outlet of the cold trap use an adapter for connecting
the three way stopcock in such a manner that you have a gas reservoir with the air balloon.
See Pic1.jpg and Pic2.jpg for detail.
![Pic1.jpg - 42kB](https://www.sciencemadness.org/whisper/files.php?pid=273155&aid=22123)
![Pic2.jpg - 107kB](https://www.sciencemadness.org/whisper/files.php?pid=273155&aid=22125)
The apparatus was now flashed with oxygen and the gas reservoir (air balloon) was filled with oxygen.
Pic3.jpg and Pic4.jpg
![Pic3.jpg - 39kB](https://www.sciencemadness.org/whisper/files.php?pid=273155&aid=22127)
The cold trap is now filled with liquid nitrogen and the gas reservoir collapsed:
![Pic5.jpg - 38kB](https://www.sciencemadness.org/whisper/files.php?pid=273155&aid=22131)
To get LOX the flow is in a such manner adjusted that the balloon is filled again:
Pic5.jpg
![Pic6.jpg - 29kB](https://www.sciencemadness.org/whisper/files.php?pid=273155&aid=22133)
I got 120 ml of a bluish liquid:
Pic6.jpg
which was tested positive for LOX (cigarette soaked with LOX and lighted):
Pic7.jpg
![Pic8.jpg - 119kB](https://www.sciencemadness.org/whisper/files.php?pid=273155&aid=22137)
Here you find further pictures and my original post:
Liquid Oxygen (LOX)
Bj68
PS:
Is there a way, that
a) the image upload is independent from posting a message.
b) and you get a url which can be shown in the post as BB Code?
PPS: Sorry for my bad Englisch writing, I have to train it again....
[Edited on 31-1-2013 by BJ68]
[Edited on 31-1-2013 by BJ68]
[Edited on 31-1-2013 by BJ68]
[Edited on 31-1-2013 by BJ68]
[Edited on 31-1-2013 by BJ68]
[Edited on 31-1-2013 by BJ68]
[Edited on 31-1-2013 by BJ68]