Liquefying air at home with my new cryopump 

I just assumed the first stage does not get cold enough. Good to know, that that was the problem. Thank you for the advice!

you welcome! :). Do you have email or mobile app like telegram or whatsapp?.

Sure, you can write me an Email at AdvancedTinkering@yahoo.com or text me on discord AdvancedTinkering#2156. I also have Telegram, but I don't like to give these contact information to strangers.

@@AdvancedTinkering ⚠ God has said in the Quran: 🔵 { O mankind, worship your Lord, who created you and those before you, that you may become righteous - ( 2:21 ) 🔴 [He] who made for you the earth a bed [spread out] and the sky a ceiling and sent down from the sky, rain and brought forth thereby fruits as provision for you. So do not attribute to Allah equals while you know [that there is nothing similar to Him]. ( 2:22 ) 🔵 And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful. ( 2:23 ) 🔴 But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.( 2:24 ) 🔵 And give good tidings to those who believe and do righteous deeds that they will have gardens [in Paradise] beneath which rivers flow. Whenever they are provided with a provision of fruit therefrom, they will say, "This is what we were provided with before." And it is given to them in likeness. And they will have therein purified spouses, and they will abide therein eternally. ( 2:25 ) ⚠ Quran

I definitely would, if I could :D Those are some great ideas! Thanks!

It is possibly an inverse stirling engine.

Yes that might be an option. But I don't know how much heat they can remove. The compressor produces a crazy amount of heat.

@@AdvancedTinkering You can find all of the specs listed. Specifications Model: WRC-300A Protection Level: IP21 Cooling power: 1.5KW(1L/min) Pump power: 260W Rated water flow: 7L-12L/min Water capacity: 10L Max pressure/head: 0.4Mpa/60Hz Rated lift: 32M Operating temperature: -20℃- 60℃ Gross Weight: 16kg (35.3lbs)

Yes definitely. In my second video I am using a proper dewar.

I would love to see someone build a Stirling cryocooler themselves! I also thought about building a cascade phase change system. I think it's your bet!

Building your own stirling cryocooler is insanely difficult and it also needs to keep pressurized helium inside. Peltiers are super inefficient and cant work at these temperatures. Cascade or mixed refrigerant joule thomson cooler is your best bet to get to -100 to -180 range. I have built a small 2stage cascade cooler myself for -100c and currently working on a precooled mixed refrigerant JT cryocooler to liquify nitrogen air oxygen etc. MRJT uses a mixture of gases in order to reduce the required pressure and make the use of regular rotary ac or fridge compressors possible. Many chinese nitrogen liquifiers use this cycle and also cryogenic lcd freezers use this to get to -180c

@@nikoskaravitakis9437 what is an LCD freezer? (the above system is using Gifford McMahon cooling - lower compressor pressure than JT, but much less efficient.

Sounds interesting. Do they retain their oily nature and are they harder or softer when dried?

Sounds interesting! I will look into the preparation of ITO.

I did exactly that :D

So indium isn't toxic😅

According to the packaging it is Helium 4.6, so far from 50/50 helium and air. I of course have no way of confirming that but it reached 17 K under vacuum.

It is called "Leidenfrost-Effect". The liquid oxygen forms an insulating layer of air, that protects my hand for a short period. en.m.wikipedia.org/wiki/Leidenfrost_effect

I would love to. But there is no way I can do that safely. So I can't do it.

@LabRat Knatz liquid ozone will explode just by itself.

I heard that there is helium for balloons that only has 80-90%. The helium I used is 4.6 according to the seller and the package it came in. Yes, vacuum would have probably been better. I flushed the lines with a lot of helium to remove any leftover air and moisture. Should I have to refill it again, I will use the proper fitting and a vacuum pump.

@@AdvancedTinkering i have tested a view, none of them were even close to 95%, but proper 4.6 is not that expensive so such a nice toy ;). When I do the filling I pull a good vacuum that would be sufficient, moisture is off cures also a huge problem. The only thing is filling it once not correctly can reduce the life quite allot. We have a lot of them running with cold traps. We monitor the temperature and when they perform worse they get send for rebuilding, the one someone used the wrong cylinder with only 90% He it did break in like 1/8 of the time. Looking forward to your experiments, there is a lot of fun to have

Thank you for the information! It's good to know, that the helium is not as pure as stated. Now I am thinking about replacing the helium. I don't want to damage the pump.

@@AdvancedTinkering but i dont think you have to hurry that much, i dont think you will run it so much that it does something big. But for long term i would try to change it, as you know they are hard to get and replacement parts as well and expensive.

They have started making baloon helium with 85% He and 15% O2 because people were using those tanks for exit bags and masks. The old mix used to be 80% He 20% N2. These pumps really need pure He to work as intended, but less pure isnt gonna cause too many problems as long as the gas is dry and has no CO2. It will run fine on pure H2 as well. Also your liquid air using this method is mostly oxygen and argon. 🤓😁

😅

Haha! They actually do like me. (I think)

@@AdvancedTinkering oh I'm sure they do too. I'm just razzing ya man. If I did the hobbies around here that you do wherever you are.( To me your accent sounds... German.) Although your obviously fluent in English. Well it wouldn't be very funny. I could get shot if I go to the pharmacy and in a German type accent say. Well. It wouldn't sound like you. I'm not trying to insult you. Where you live is probably way less paranoid than where I stay. I'm talking about the people.

Man! I wanna live in the town where you stay. Everyday I would go to the drugs store. Yes, I have list Mr. Pharmaceutical elements supply worker. 5lbs RP. 5gal I. 1.0 oz allergy tablets 5gal H202 ECT.ECT.ECT.EXT

You're koool. I'm more like you . I kinda don't fit in where I stay. I don't like gangs. I want intelligent friends. I want to persue my interest in all the scientific knowledge of now. Problem is.... I'm considered abnormal for these notions.

You don't need a special cooling setup just to make (do you mean liquefy?) N2O4.

Hi, I'm guessing you are talking about the cryopump? I got it really cheap from a viewer. Normally they are pretty expensive. Way to expensive for me at least. Hyperspace Pirat made a video where he tries to build a pulse tube cryocooler. Hopefully he will be successful in building one capable of liquefying nitrogen.

It's a mixture consisting of liquid nitrogen and liquid oxygen.

@@AdvancedTinkering Ah, ok. Nitrox. Cool. :)

I heard of those mixtures but this balloon gas is, according to the manufacturer, 99.996 % pure.

Energy is constant, so there's no magic way of cooling down a room. You have two flows in this case, the addition of electric energy to the pump that is converted into heat and heating the room, and the subtraction of heat through the cooling water going down the drain. The pump is only moving heat from the cold side to the water, the question is how efficient it is. It it moves more heat energy to the water than the electric energy needed to run the pump the room will slowly cool down, if not, the room will slowly heat up.

Thank you! I live in Hessen. I would really like to do a collaboration but I think moving the cold head and compressor would be a huge hassle. And I have to test how cold it gets under vacuum. At ambient pressure the temperature won't drop below the condensation point of nitrogen. How do you plan on supplying the hydrogen? Using a gas cylinder or making it via hydrolysis?

@@AdvancedTinkering My reply yesterday got deleted for some reason. Probably because I added contact details. Well I live in hessen too so that is great! I would definetly use a hydrogen cylinder. Everything else will probably make it too complicated. I will write you an email tomorow with my contact details, so we can talk about this if you want.

Air does contain oxygen and nitrogen. Due to the lower boiling point of nitrogen, it will condense slower than oxygen and evaporate quicker than oxygen. I you let liquid air stand for a while, you will be left with liquid oxygen. The blue color and thay it reignites glowing paper is a strong indicator for a high oxygen concentration.

@08:01 The liquid in the glass doesn't look blue, only the shadow of the beaker on the white mat looks blue. I've watched another video of someone do something similar and his liquid air wasn't blue either. So if as you say the liquid nitrogen has gassed off, where's the oxygen? @@AdvancedTinkering

It's pretty hard to capture faint colors like this on camera. But I can assure you it was blue. Not as blue as pure liquid oxygen but noticeable.

sorry but there's a lot of confusion because according to applied science and his video Liquid Nitrogen Generator - Overview, he produces liquid air in the video and his is NOT blue. He even says that it does not have a tint of blue to it. I'm sure he would have wanted his liquid nitrogen to have gassed off to have shown the blue tint of the liquid oxygen but he never did this in his video. I cannot accept your word when another person is doing the same thing and gets a different result. From your video, I cannot see a liquid with a blue tint. So where's the oxygen? @@AdvancedTinkering

I don't know what to tell you. You are correct about liquid air not being blue. But it's simple physics. Nitrogen has the lower boiling point and evaporates first, resulting in a higher concentration of oxygen in the leftover liquefied gasses. I'm not sure if there is an azeotrope between oxygen and nitrogen but I can assure you that the oxygen concentration increases to a point were you can see the blue color.

I tried using my oxygen concentrator as a cheap nitrogen concentrator, but there is still some oxygen left. I need a Nitrogen separation membrane.

@@AdvancedTinkering I have been wondering if one looked at the plumbing of a O2 concentrator and a N2 concentrator (as used to make 'air' for tyres) and see if one can swap the plumbing around a bit to favour the purity of the N2 stream.

Haha, I still get the some terminology wrong in English. Thanks for pointing that out!

​@@AdvancedTinkering You didn't use any wrong terminology, actually. All spanners are wrenches in English, but not all wrenches are spanners. It's like coloring with all the colours of the rainbow on aluminum foil while wearing an aluminium hat.