Now, back to the device. Doesn't the act of compression heat it up significantly? I work as an engineer for one of the companies that makes Liquid nitrogen. I have just added a new web tutorial on how to make your own N2 gas from the air. Furthermore, a cryocooler has a very low production rate. Having seen the results of a LOX leak on tarmac - it is NOT a good thing to have hanging around! Two, you can use a turbo expander. The scrubber uses a material called zeolite, or molecular sieve. * There is a chance the atmosphere around the equipment will be oxygen rich, so take care to eliminate all sources of ignition, such as electrical switches, flames, static on your clothes, sparking tools and anything that gets very hot. If you can get a 12 MERV this is better. Compressor - This compresses the gas to high pressure. @ helzcurrah Looking forward to seeing you do some instructables on related topics. If you are going to do this with a standard refrigerator compressor than you can use copper tubing. How to Make a Liquid Nitrogen Rocket: Liquid nitrogen explodes a soda bottle in just a few seconds. Always wear full length clothes and insulated gloves. I feed this N2 into the liquid nitrogen generator. Process for Making Liquid Nitrogen. You determine the size of the scrubber based on your flow rate. Liquid Nitrogen Recipe This recipe version is made with these ingredients: sambuca, ouzo anise liqueur. And also will these learnings help me in the building of a natural gas liquified? This should filter 1-3um particles. My compressor allows me to get to -320F in 45 minutes. Definitely do not use rubber pipes, seals or oil based lubricants! I go through the engineering calculations for verifying the integrity of the tubing at the tutorial site. By fine I mean the holes are only angstroms in size. Again, one could go to 0.027" wall, but this got too thin for me. Liquid nitrogen explodes a soda bottle in just a few seconds. I have gotten a lot of comments suggesting that I am making liquid air, which contains O2, and not liquid N2. Carbon steel is not an appropriate material, stainless steel, aluminium or monel is better. I am putting out about 30 L/min of 98.5% N2. Regenerative cooling tower - Hot compressed gas flows through a counter-current system to cool the gas to cryogenic temperatures. 2 years ago, I realize that this is old, but any leads on the CMS vender? 6. I wanted to make the machine that liquefies the gas. You can make your own homemade liquid nitrogen using readily available materials. I insulated the connection to the stem with Teflon to reduce any heat transfer through the stem from the outside. The stainless steel tubing is surrounded by the Teflon tubing. *If you are running this in your garage (I know I told you not to), don't enter before you take an atmosphere reading. I also used this spot as a place to insert a gas-analysis meter that I made to monitor the purity of the N2. * Make sure all the pipework and vessel is constructed from clean, oxygen-safe metal. I plan on posting this as a new Instructable in the near future. At the end of this tutorial I briefly mention the PSA I made for making the pure N2 from the air for the generator. Above is a picture of an early version of the generator using a recycle can. Industrial manufacturers fill the container with perlite and create a vacuum to prevent heat from entering from the environment. This can agitate the liquefied gas in the reservoir and blow it back out into the gas stream. The other connects to the regenerated gas. On the following pages I will walk you through the basics of how to build your own liquid nitrogen generator. thanks for the reply. Baffle - This reduces the velocity of the expanded gas so it does not dissipate the cooled liquid into the gas-stream. It also provides a larger surface area for condensation. The high pressure allows you to have a larger temperature drop when you throttle the gas to a lower pressure. Homemade "Liquid Nitrogen" Materials . This is the part that will take the most work. Of course, the last leg of the regenerative circuit gets close to ambient temperature so it retains its integrity. Alternatively, you can pour the alcohol directly. Also, although this "poor man's liquid nitrogen" is very cold, it doesn't vaporize off your skin like true liquid nitrogen, meaning it can give you frostbite very easily. You know like death.. all joking aside thanks for pointing out some of the dangers that can be encounterd with this. Just made it as long as possible. You need to slow the gas down to allow the droplets to collect and drop into the container. I made a pressure swing adsorper that removes the O2 from the air, leaving 98.5% pure N2. I carefully drilled a hole 1/64" smaller than the tubing. I think adding a timed fresh air inlet fan to the "garage" to cycle out the undesirable product might be good. I will add this as a new Instructable in the next few days. The N2 is compress and cooled. I fashioned a circular ring of stainless steel that I got at a hardware store and fixed the filter material on top of the 200um screening. Did you ever think you could make liquid nitrogen in your own garage? Basically, the baffle connects to the output of the needle valve. Frostbite may also occur if you spill any cold product on yourself. Did you make this project? Of course, if the flow rate is less then you have to add more time. You need to protect the compressor's valves and cylinders from debris and water. Make sure the copper wool (abrasive scrubber) does not come off. If you start to experience the signs of an infection, such as fever, swelling, tenderness and oozing from the site, you should notify your doctor immediately. If the alcohol warms up, you can re-chill it using more dry ice. Am I correct, those are old coaxial anesthetic sets you are using to scavenge the atmospheric nitrogen gas? If you want 3-4 SCFM then you need about 10-15lbs of the material and size the scrubber based on this. You want the Teflon tubing diameter to be a little bigger than the coil. Pour the alcohol into a plastic container and nest this container inside a bucket of dry ice. Without this the water and CO2 would freeze and clog the tubing and valves, 2. Liquid Oxygen Materials . In the past, making liquid nitrogen in your garage seemed impossible. Too MUCH oxygen can be lethal as well. You then insert the coil into the garbage can or container. Ammonia – made up of three parts hydrogen and one part nitrogen (or NH 3) – has had a momentous impact on society.Without the mass production of this … If you don't use all of the liquid at one time, you can store it in the freezer or an insulated cooler to help it last longer. You can do this with 40-60 feet, but this increases the cool-down time. If I used a second stage I could get 99.999% pure N2. You can see how it compares with an Omega digital thermometer here. My final tower uses a large concrete cardboard form container that is 50 inches high and 24 inches in diameter. I used 20 feet of 1/4" 304 seamless stainless steel with a 0.035" wall thickness. You need to acquire a cryogenic refrigeration unit and strip out the cold head. A small tube of Teflon goes from the bottom of the thermos to the outside through an insulated jacket to allow the liquefied gas to escape. You can make this components out of PVC pipe. 3 years ago. Throttle - This is a needle-valve that enables a controlled expansion of the gas without losing the pressure behind it. The majority of suffocation deaths happen when the worker is unaccompanied. The production rate is about 350 cc/hr.