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Author: Subject: LOX (Liquid Oxygen)
BJ68
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[*] posted on 31-1-2013 at 05:02
LOX (Liquid Oxygen)


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

Pic2.jpg - 107kB


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
Pic4.jpg - 39kB

The cold trap is now filled with liquid nitrogen and the gas reservoir collapsed:

Pic5.jpg - 38kB

To get LOX the flow is in a such manner adjusted that the balloon is filled again:

Pic5.jpg

Pic6.jpg - 29kB

I got 120 ml of a bluish liquid:
Pic6.jpg

Pic7.jpg - 37kB

which was tested positive for LOX (cigarette soaked with LOX and lighted):

Pic7.jpg

Pic8.jpg - 119kB







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]
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