Filling the oxygen concentrators with new molecular sieves - Project H #17 

Why don't you use silica gel to filter out moisture at the starting stage

Yes, but I know it's well outside my skill range, lol.

What is the amount of oxygen filtering does this machine do Dalibor ??? Nice video Sir. .

That was a natural choice :-)

How you made it? Can you explain the tube ?

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-bK35rSqmhug.html

:-)

Indeed

Yes, this is my source of inspiration and positivity!

I am relieved as well, that would be crazy to trash $1k..

Yeah congratulations! Thanks for the update.

Wher did you get dieve

Sieve?

Oxygen sieve is the name of the device, the cans filled with the powder are sieves.

Hey, thank you! I am average, just focused and working until the problem is solved ;-)

Exactly what I said.. And the zeolite should be stored air tight...and even in a small air conditioned closet to minimize the moisture present in the air..

thanks! Googly eyes for Roomba - writing that to the TODO list :-D

SeanBZA i tried vacuum (below 1mBar, 15 hours, 250C), they were even worse after this process.. not sure if the sieves need to be under vacuum - they are under air in the concentrator normally, for decades..

@@daliborfarny Will keep them in like new condition till you use the granules, instead of them getting atmosphere in and degrading. Not going to need much, just well under ambient and with a seal that will keep them that way.

Glad that all worked out Dalbor, nice when plan comes together.

that would deplete rather quickly, considering how much air has to go through...

The oxygen generator uses molecular sieves to separate nitrogen and oxygen, not just dry air.

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Thank you! Yes, the burners produce carbon dioxide and water vapor. There is an extractor hood that takes the gases out, this makes fresh air to enter the room by the door.. so it should be fine..

Hey, you here! I miss your videos!

I tried 250C both in air and vacuum (

@@daliborfarny how about nitrogen flush? From the bottle it's really dry and should be cheap...

@@AKAtheA Do you mean flushing the sieves with nitrogen to regenerate them? I tried vacuum and it didn't work - so with N2 it might be even less probable.. But we will find a way :-)

@@daliborfarny How long under that heat and vacuum?

was looking for this comment

I was looking to comment that now that it's working so well ventilation is required, not just for people but the machine too!

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It is lithium molecular sieve from China

The supplier name is JALON from China The grain size is 1.6-2.5 mm diameter

А не хотите спросить тип цеолита который он использовал? От этого многое зависит!

neur303 might be - or it is just a pressure change.. we are rising the pressure from vacuum to atmospheric very fast..

The heat of adsorption can be quite surprising with these.

I am pretty sure they come pre-dried hence the double packaging and vacuum. I think for certain applications they have to be dry. As soon as you open them they will adsorb moisture from the air and like silica gel get hot depending on the speed. The vacuum certainly helps to do this fast. Anyways I am happy to see it works for you now!

Look up "latent heat of condensation"

Sure, that would help - I need to find out how exactly it is done in the original machine :-) there are no dehumidifiers..

I installed a compressor dehumidifier for my parents’ basement, it works a charm (and provides me with waay more milli-Q water than I need). You could probably hack one of these for your purpose... Since it works from a regular fridge compressor, the noise level is very low.

@@Sodabowski We have two dehumidifiers of this type, they work well - we can end up using these, but I first want to know how the original oxygen concentrator did the same operation without using dehumidifier..

Vacuum heat and a chemical dessicant will do the trick,

It's around 1.4 - 2 bar. Around 2.2 - 2.5 bar starts flushing out the safety valves on compressors. Me - the guy in red shirt at 0:41 who was working on it as well.

Usually 10,000hours - 15,000hours

Hi, yes, after this change of zeolite there wasn't any significant problem with this machine and it is working just fine. Me - the guy in red shirt at 0:41 who was working on it as well.

What is experience with CESA make sieves?

In a 100 m^3 room, there would be ~20,000 L of pure oxygen (21% * 100,000 L). At 30 L/min generation, the depletion rate would be nearly 10%/hr of the initial volume of oxygen. So if the room was air tight, after an hour the air would change from 21% to 19% oxygen, approximately. An air turnover rate of 300 L/min within a 100 m^3 room would offset the oxygen depletion rate by 95%. So any reasonable air handling system will easily offset any oxygen depletion. However, you wouldn’t want to be caught in a closet with this oxygen generator running.

Hi bro, it's lithium zeolite.

It would take a LOT of silica gel. (The moisture is not a problem) I live in Houston TX USA where the summer humidity is awful and the concentrators work fine at 90-95%, using 30 year old sieve! The sieve is regenerated by baking under vacuum.

I made a video update, please post comments under that video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7zN6aUKlhZI.html

Hola soy de Perú, tengo un modelo de concentrador de hasta 1 a 7 lpm de 85-92% funciona con zeolita LiX, escribeme: cecil.calle@gmail.com.

His device is more than 10lt. Usually, devices should used the lithium zeolite if exceeding 5lt

what do you mean?

@@lukas441stu They can be configured to concentrate nitrogen rather than oxygen. PSA nitrogen generators are often used in the production of liquid nitrogen.

@@douro20 the sieve material for psa nitrogen is carbon based.

@@nitrousman8882 Usually, activated carbon is used for hydrogen purification

@@eazanhan6366 perhaps, but CMS 200 is also used in PSA nitrogen production.

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It's 0.4mm-0.8mm beads

We do - this can serves as a packaging for our Blub clock ;-)

Dalibor Farný oh, I wish I can buy those can individually though, don’t have that much extra money lying around

By our standards Sodium, 1liter 600g, 5liter 2400g Lithium, 1liter 200g, 5liter 1200g

It's 20*40 mesh or 0.4-0.8mm,lithium type zeolite

@@eazanhan6366 does the cylinders are "series" connected? or work alternating. System uses vacuum for evacuating residual nitrogen? Thanks :)

@@enriquegonzalez2802 1. The cylinder is actually the adsorption tower of the oxygen generator. One cylinder is adsorbed while the other cylinder is regenerated, and they work alternately. 2. The system does not use the separated nitrogen, which will be discharged into the air

Type 13X and others that are proprietary.

@@glasslinger thank u so much

"Regeneration of the zeolite is both simple and complex. Approximately 70-80% of the moisture can generally be removed by “pulling a vacuum”, i.e.; lowering the humidity level. This fraction is known as bulk water. The amount of water removed from the zeolite is dependent on how low the humidity is lowered but, without a method to exhaust this extracted water, the moisture merely leaves the zeolite and re-enters the air stream. This again lowers the saturation point of the zeolite. Therefore, the zeolite adsorbs moisture until it cannot adsorb more. If the humidity level falls the zeolite deadsorbs moisture until it is in “balance” with the lower humidity level. At that point it begins to adsorb moisture and the cycle is repeated. The remaining water (which cannot be removed by pulling a vacuum) is very difficult to remove and may require prolonged heating at moderate (150C or 212F, the boiling point of water) to very high (600-800C, 1112-1472F) temperatures. This fraction is coordinated to the metal cations present in the zeolite. There would need to be a chemical analysis of the particular zeolite (s) in use to determine the characteristics before it could be determined what level of heat is required to" sufficiently remove lower levels of moisture. It should also be noted that heating zeolites to very high temperatures can cause extensive structural damage." Or you would just look at the datasheet that tells you how to handle the zeolite as provided by the manufacturer. This is the same thing people do to plastics before they are used in injection molding and printing.

1. Do we need any special room for filling zeolites in containers, like maintaining pressure, temperature or humidity of the room? 2. How did you close that remaining zeolite can to keep it safe for a good amount of time until you need them again?

@@hp5683 the lower humidity the better, but no special conditions are necessary. Just avoid 85%+ humidity. The zeolites are exposed to ambient air anyway during the operation.. I keep the rest of the zeolites in the plastic bag and closed drum in 20C, 70% humidity room. Should be ok..

@@daliborfarny Did you have any problem about purity after filling zeolites as you did here in this video? That cylinder is working above 90% still or you refilled it again? Thank you!

@@hp5683 No, the machine runs with the same zeolits every day several 3-5 hours, the oxygen concentration is now around 85% in average. We keep the machine in a small room with air dryer that keeps the air humidity at around 60%.

Hi, can you tell me where you got those canisters which hold the zeolite? Is it salvaged from the old o2 concentration units?

nah, in the future it will become more like a 12 cylinder beast xd

@@lukas441stu can I have a schematic diagram and parts list docamitverma at gmail.com

The zeolites in this video is usually use for homehold oxygen gennerator. If you want a bigger PSA generator, may I know the flow rate？

Zeolite wher is it available

How you know purity of oxygen

@@eazanhan6366 we need to built 500 LPM unit ? What is zeolite required and how many cylinders.would you send me sketch to ashishkadam958@gmail.com

@@jagadeeshapatil75Use the oxygen concentration detector

He is our client.We are Jalon company. if you want to change the molecular sieve oxygen generator, welcome to contact us, we are specialized in the production of oxygen molecular sieve. My mailbox is erin@jalonzeolite.com

@@erinhan3393 hello, what is the useful life of zeolite?

@@camino_eterno8840 Usually 10,000 hours-15,000hours

Hi Luqman, this can be caused by many reasons. First, check whether the machine is leaking and whether the valve is working properly. Secondly, it is necessary to check whether enough molecular sieves are loaded, and if enough molecular sieves are loaded, check whether the performance of molecular sieves does not meet the standard.

I made a video update, please post comments under that video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7zN6aUKlhZI.html

Hi, thats tje reason why we abandoned the normal oxycons - too many strange issues :-) I guess yours is leaking - search for a leak on the pressurised air line.

Please check the compressor and pipeline on your oxygen generator

I ordered the same zeolite from the same supplier and at the time it seemed to be the only public facing vendor. You sorta take what you get when vendors won't talk to you.