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Ox01: Single Column



  • Simplicity
  • Needs less components
  • Can be operated manually

Video of latest prototype

Parameters and performance

  • 290 g of Zeolite LiX in Reverse Osmosis Membrane housing
  • Feed: 4.4 bar compressed dry air
  • Production: 1.5 l/min with 90% oxygen

Additional information

This is work in progress. Please contribute in the comments. All valuable inputs will help us define the best solution.


  1. Hello thank you for sharing this project…please share a better overview of setup so it can be duplicated, could not figure out where the second 3 way valve is here?? On the BOM it mentions 2x 3 way valve the link however is to a different part… please provide exact festo part number or link… only seem to be one 3 way valve here also how to connect the first 3 way valve is confusing with all the tubing and where is exhaust line ??

  2. I attempted to emulate your set-up, but was only able to acheive 30% output even at a lower flowrate. The differences were in the size and set-up of my Zeolite chamber, which was inside a soda bottle with the inlet tube being fed to the bottom. I also wasn’t able to pressurize/depressurize my container at the speed you did, I assume due to my different valve types.

    Regarding the valves, do you have a no-return valve between the zeolite chamber and the storage tank? It seems you have a flow rate valve there?

    Many thanks, Aaron

    • Hi Aaron,

      thanks for sharing your experience. We have made a similar setup with the coke bottle, it’s a cool idea! What is your input pressure from the compressor?

      We usually have a needle valve between the zeolite column and the storage tank to allow for proper pressurizing. Using one could help you with your problem of properly pressurizing. Let us know!

      • Have you tried a PVSA variant on either the single or double column versions?
        I understood that the lithium exchanged 13X zeolites desorb better under vacuum.
        Excellent initiative here. Too bad the circumstances around COVID seemed to be a driving force

  3. Hello! Thank you for sharing your knowledge.
    I was wondering, how do you manage to get the nitrogen out of the zeolite bed in this set up? Are the zeolite saturated and then cleaned at each cycle?
    Hope the question is clear! Thank you

    • Hi Clarisse
      Exactly, each production cycle contains a “purge” step, where by depressurization of the zeolite chamber, the nitrogen sitting in the zeolite cavities is desorbed and released to the environment. I hope this helps.

      • Yes thank you! Do you use a special device to depressurize, like a pump or something? Or the zeolite chamber depressurizes by itself by opening a valve?
        Thank you

    • It takes a couple of minutes to reach steady state, depending on how your setup is. It takes some time though to identify the optimal cycling parameters to reach high O2 concentrations

    • Hi Jesse,

      For the same pump performance, using more 13X won’t improve on O2 output. However if you can get a bigger pump, you could get more oxygen flow to compensate for the zeolite performance.


    • If you mean the flowmeter, you can use any flowmeter regulator that works in the range of pressures you are working. I would not recommend to buy our flowmeter as it is expensive and not optimal for this application. If you are talking about the needle valves, any needle valves work really, as we are not working at high pressures.

  4. Hello Julian,

    I am the director of Social Impact For All, a non-profit organization in the US. We are designing a new project with hospitals in Cameroon and want to make oxygen generators following your guidance. Would it be possible? Also, how can I buy the zeolite column (or oxygen column) you used in the video?

    Thank you so much for your help.

    Best regards,

    • Hi Zachery,

      I got your email, thank you for your interest! At the moment we do not have a lot of manpower, this sounds like quite a large project! Our project is more focused on supply chain limitations and DIY than large scale hospital projects. The process of licensing and certifying our prototypes is long and costly, it depends on what your timeline and budget is. The zeolite LiX can be bought at Alibaba or Zeochem (should deliver in US)!

      Hope that helps a little bit

  5. Hello, greetings from Peru, thank you very much for the information published, I was finally able to install the complete system and I obtained a concentration of 93% at 1 L / min, I used 450 g of 13X HP zeolite. I work in a metrology laboratory and the system will help me to obtain different oxygen concentration values by varying the pressure, flow and nitrogen purge time, with the generated values I will seek to calibrate oxygen sensors of medical equipment.

    • Hey Carlos,

      thank you for your feedback and valuable insights. Those are good numbers considering you are using 13X zeolite!

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