Sciencemadness Discussion Board
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: LOX (Liquid Oxygen)
Hazard to Self

Posts: 73
Registered: 12-3-2012
Member Is Offline

Mood: No Mood

[*] 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
Three-way stopcock
Air balloon
Silicone tubing
Pressure reducer for Oxygen
Stative and Clamps


Oxygen in gas zylinder (5 L volume and 200 bar)
Liquid Nitrogen


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:


Pic6.jpg - 29kB

I got 120 ml of a bluish liquid:

Pic7.jpg - 37kB

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


Pic8.jpg - 119kB

Here you find further pictures and my original post:

Liquid Oxygen (LOX)



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]
View user's profile View All Posts By User

  Go To Top