Sciencemadness Discussion Board

6 g/hr Ozone Generator Build

runninfarmer - 26-4-2015 at 18:14

I've built a 6 g/hr ozone generator using these ozone generators off ebay:

All the plastic brackets are 3D printed and I will post the stl files on thingiverse if anyone's interested. Here's the link to the thingiverse page: It's working pretty well. I'm going to test it on some canola oil.

IMG_0944.JPG - 1.1MB

[Edited on 27-4-2015 by runninfarmer]

[Edited on 27-4-2015 by runninfarmer]

IMG_0945.JPG - 1.1MB

[Edited on 27-4-2015 by runninfarmer]

Dr.Bob - 26-4-2015 at 19:24

Cool, I have used a few ozone generators before, but that is a nice small size. The bigger ones are a real PITA to use, and the ones I used were from the 1970's or so, so not real modern. Not that the technology has changes in a century. But very cool.

runninfarmer - 26-4-2015 at 20:25

Thanks Dr.Bob! I'm excited to test it fully. Need to get my hands on a decent sized oxygen tank and regulator.

Varmint - 27-4-2015 at 02:52

What is the fan for?

And if there is anything but quartz or glass in contact with the gas you don't have an ozone generator, but an ozone and possibly toxic byproducts generator.

6G/Hr based on what?

runninfarmer - 27-4-2015 at 06:13

Pretty sure they're quartz tubes, you need a cooling fan to blow on the tubes, otherwise they overheat. Only byproducts you should get are ozone, if running pure O2. Some people run air as input, which can lead to NOx and HNO3 formation which would be bad. Most ozone tubes are designed with quartz and stainless steel. If you go to the ebay link, each tube is rated to produce 3 g/hr. I have not verified this yet, so I believe the 6 g/hr rating is fair.

[Edited on 27-4-2015 by runninfarmer]

hissingnoise - 27-4-2015 at 06:57

. . . each tube is rated to produce 3 g/hr.

Something of a wild exaggeration, obviously . . .

jock88 - 27-4-2015 at 07:32

How would you actually go about verify how much ozone it products?

hissingnoise - 27-4-2015 at 08:09

Dissolve it in CCl4, and weigh . . .

runninfarmer - 27-4-2015 at 08:33

How is that an exaggeration, particularly if passing pure O2? Unless you know the design equations for ozone generation, how do you know? I've read online most of the small scale generators use the same size and type of tubes. This board is full of haters apparently.

[Edited on 27-4-2015 by runninfarmer]

Varmint - 27-4-2015 at 08:51

Describe the output voltage and current of the high voltage sources please.

runninfarmer - 27-4-2015 at 09:27

That is a good questions. The ebay page says 10W, while I found an identical one with 40W rating at 3 kV. Based on these numbers, I would say 3kV at 3-13 mA.

Marvin - 27-4-2015 at 10:14

I would think a colourimetric iodide test would work for ozone determination. Either go forward with a known oxidising agent to get reference levels or back titrate with a reducing agent.

3g/h from a 10W device sounds... optimistic. I think most people would expect 1g/h or less.

Molecular Manipulations - 27-4-2015 at 10:23

Sadly, running two ozone generators in series wont quite double the production yields. Diatomic oxygen is split into seperate atoms, called radicals. These are very unstable, and will combine with the first particals they smash into, if they hit an oxygen molecule, they form ozone, a radical affords a oxygen molecule, and an ozone molecule produces two oxygen molecules. Thus the higher the concentration of ozone, the higher the chances of creating more oxygen from it, and the lower yields will be.

macckone - 27-4-2015 at 19:57

Nitrogen oxides are an unavoidable by-product with air contact. When ozone contacts nitrogen the nitrogen oxides form. Unless you use pure oxygen and pump it into the substance you want to oxidize.

hissingnoise - 28-4-2015 at 01:31

This board is full of haters apparently.


runninfarmer - 28-4-2015 at 05:47

Yes, I have already stated air will form NOx with ozone, which is why I intend to use pure O2. Also, to answer Molecular's statement, this is run in parallel, not series. There will be two pure O2 feeds and combined into one outlet after ozonation.

Molecular Manipulations - 28-4-2015 at 08:21

Oh I see, that should double the total production, but the concentration will remain the same.
Macckone, ozone cannot oxidize nitrogen under standard conditions, you are right that using air can produce nitrogen oxides, but this due to dinitrogen being split into radicals, which combine with oxygen or oxygen radicals combining with dinitrogen. Never ozone oxidizing dinitrogen.

[Edited on 28-4-2015 by Molecular Manipulations]

macckone - 28-4-2015 at 14:33

Never say never, there is an article from the AMS regarding nitrogen fixation due to lightning that found that ozone can oxidize nitrogen. If nitrogen is present in the feed gas then most nitrogen oxides are a result of lower oxides reacting with ozone and oxygen to form higher oxides. N 2 O is formed by ozone with nitrogen.

Molecular Manipulations - 28-4-2015 at 19:36

Ref? I just searched for a couple minutes with no hits. Ozone reacting to make nitrous rather than nitric indeed makes kinetic sense, and does explain how nitrogen could get oxidized without making the color or smell of nitric. However I bet nitrous reacts again with ozone to make oxygen and nitrogen, not sure about that though.

macckone - 28-4-2015 at 20:24

Not sure if this is the right one.

Most of the lower oxides are oxidized by ozone and oxygen in the
presence of moisture. There are lot of pathways that are not
very common at room temperature. I think the key is ozone
being a very unstable compound and colliding with nitrogen with
enough energy. Ozone at room temperature probably reacts very
slowly but at a few thousand degrees it will almost always react,
Ie. In microseconds.

cmos6667 - 29-4-2015 at 00:59

sorry if this is off topic but any idea if this can be modified to produce NO?

hissingnoise - 29-4-2015 at 02:25

Yes ─ Jacobs Ladder and the Birkeland-Eyde process!

Both produce higher temperature arcs . . .

cmos6667 - 29-4-2015 at 05:19

Thank you, so basically you could modify an ozone generator? (Maybe higher output)

hissingnoise - 30-4-2015 at 02:06

You could also check out B-E process videos on youtube . . . ?