If you’ve ever worked in manufacturing, food packaging, pharmaceutical production, or any field that relies on inert gas for safety, preservation, or process control, you probably already know nitrogen is non-negotiable. As someone who’s spent the last 12 years running a nitrogen supply business, I’ve heard more questions than I can count from new clients: “Is nitrogen just air, bottled?” or “How do you actually pull millions of cubic feet of nitrogen from thin air, anyway?” The short answer is: yes, most industrial nitrogen comes straight from atmospheric air—but the process to purify it and make it meet strict industry standards is way more complex than just pumping air into a tank. Let me break this down like I do for every new customer who walks through my warehouse doors. Nitrogen
First, let’s get a quick refresher on air composition because that’s our raw material. Dry air is roughly 78% nitrogen, 21% oxygen, 0.93% argon, and tiny traces of carbon dioxide, water vapor, and other noble gases. So, we start with something free, abundant, and everywhere around us—but separating nitrogen from all those other elements is where the work happens. There are two primary industrial methods for making nitrogen, and each has its own use case depending on how much nitrogen a client needs, how pure they require it, and how it will be delivered.
The first method, and the one we use most for medium to large-scale customers, is cryogenic distillation. This is the process that’s been used for over a century to separate air into its individual components, and it’s still the gold standard for ultra-high-purity nitrogen. Here’s how it works step by step, no confusing lab jargon I don’t let my new technicians use:
First, we take atmospheric air and run it through a pre-treatment system to strip out the impurities that would mess up the distillation process. Air coming off the street has water vapor, carbon dioxide, dust, and even trace oil from vehicle exhaust, so we can’t feed that straight into our distillation towers. First, we cool the air slightly and run it through a filter to remove dust and particulates. Then, we push it through molecular sieves—small, porous beads that are sized to trap carbon dioxide, water vapor, and other heavy contaminants. The sieves work like a sponge, but for molecules: CO2 is 2.5 times bigger than nitrogen, so it gets stuck, while nitrogen passes right through. This step is crucial because if those impurities freeze inside the distillation system later, they would block pipes and ruin the whole process.
Next, we cool the pre-treated air way down—extremely way, like -196°C (-321°F) cold. This is where most people’s eyes go wide, but it’s a straightforward concept with cryogenic systems. We use a process called refrigeration cycles, similar to what’s in your fridge, but scaled up to industrial size, to gradually lower the temperature of the air. As air cools, different gases turn from gas to liquid at different temperatures: oxygen turns liquid at -183°C, argon at -186°C, and nitrogen turns liquid at -196°C. So we don’t just cool air to one temperature—we cool it in stages, separating fractions as they liquefy.
The heart of cryogenic nitrogen production is the distillation column, a towering, insulated steel structure that’s often 100+ feet tall. Inside the column, we have packing material (small, plastic or metal beads) that creates a large surface area for mixing gas and liquid. Here’s the magic: we feed the partially cooled, liquefied air into the middle of the column. Warm gas rises up from the bottom, and cooler liquid falls down from the top. When gas meets liquid, the heavier oxygen and argon molecules dissolve into the liquid, while the lighter nitrogen molecules stay in gas form and rise to the top of the column. At the very top, we capture that pure gaseous nitrogen, warm it back up to room temperature, and either compress it into high-pressure cylinders, chill it into liquid nitrogen for transport, or pipe it directly to our client’s facility through an on-site system.
Cryogenic nitrogen is the only industrial method that can produce nitrogen with 99.999%+ purity, which is critical for industries like pharmaceutical manufacturing, semiconductor production, and food and beverage that require near-zero impurities. For example, a chip maker I work with needs nitrogen so pure that even a tiny amount of oxygen would ruin a microchip. That said, cryogenic systems are expensive to build and run if you only need a small amount of nitrogen, which is why for smaller, on-demand needs, we use a second method: pressure swing adsorption (PSA).
PSA is the workhorse for small to medium-sized operations, and it’s what most of our small manufacturing clients use. Unlike cryogenic distillation that cools air to super-low temperatures, PSA works at room temperature, using pressure and molecular sieves to separate nitrogen from oxygen. Here’s how it works: we start with two tall cylindrical towers filled with those same porous molecular sieves I mentioned earlier, but for PSA, the sieves are specially designed to trap oxygen (and argon) while letting nitrogen pass through.
Here’s the swing part of pressure swing adsorption: first, we feed compressed, pre-treated air into the first tower. At high pressure (usually 100 psi or so), the sieves in the first tower absorb almost all of the oxygen, water, and CO2, leaving pure nitrogen gas to come out the other side. Once the sieves are full of impurities (usually after 10 to 15 minutes), we switch the air flow to the second tower to keep nitrogen production going nonstop. Now, we drop the pressure in the first tower to almost atmospheric pressure, which makes the impurities detach from the sieves so they can be vented out into the air. As soon as the first tower is cleaned, we switch the air flow back, and the cycle repeats.
PSA systems are cheaper to install and operate for smaller volumes, and they can produce nitrogen with 95% to 99.9% purity, which works for most applications: metal welding, food packaging, beer carbonation, and even tire inflation for large trucks. I’ve had clients switch from cryogenic nitrogen to PSA for years because they thought PSA was less reliable, but we’ve modified our PSA systems with automated cycle controls that cut downtime to almost zero. Last year, a local metal fabrication shop switched over and saved $12,000 a year on their nitrogen supply, no drop in quality.
There’s a third method, membrane separation, which is even newer and works a lot like PSA, but uses thin, hollow fiber membranes instead of sieves. Membranes are made of flexible polymer material that lets small nitrogen molecules pass through, but traps larger oxygen and CO2 molecules. This method is simple, no moving parts beyond air compressors, and perfect for very small, on-site needs—like a small café that uses nitrogen for cold brew coffee, or a lab that needs a constant small supply of nitrogen for experiments. The downside is that membrane separation tops out at about 98% purity, so it’s not suitable for high-precision industrial uses, but it’s a great budget option for small operations.
As a nitrogen supplier, my job isn’t just to deliver gas in a tank or pipe. I help clients figure out which method is right for their business. A food processing plant that packages beef to extend shelf life needs nitrogen that’s 99.5% pure to keep the meat from spoiling, so PSA is usually a good fit. A pharmaceutical company that uses nitrogen to fill drug vials needs 99.999% pure nitrogen, so we source from our cryogenic production partners to meet their strict quality standards. A semiconductor plant can’t afford even a single oxygen molecule ruining a $10,000 wafer, so we work with them to install on-site cryogenic systems that never run out.
I also see a lot of clients who don’t realize they can save money by switching from traditional bottled nitrogen to on-site production. For example, a client who uses 500 cubic feet of nitrogen a month might think bottled is the only option, but on-site PSA systems can pay for themselves in 18 to 24 months by eliminating delivery fees and waste from half-empty cylinders. That’s why we offer free nitrogen audits for any potential client—we come to their facility, look at their usage, and recommend the best system for their needs, not just what makes us the most money.
One of the biggest myths I hear from new customers is that industrial nitrogen production uses a lot of energy. It’s true that cryogenic systems use more energy than PSA, but it’s important to put that in context: nitrogen production accounts for less than 1% of global industrial energy use, according to data from the American Gas Association, and most of that energy comes from efficient, modern systems. Also, using nitrogen properly means less waste—for example, a manufacturer that leaks nitrogen into the atmosphere is wasting gas and energy, so we help them install leak detection systems to cut that waste.
Another thing I make sure every client understands is that nitrogen isn’t a “one-size-fits-all” gas. I had a client a few years ago who used nitrogen for welding, and they switched to a cheaper supplier that cut corners on purification. The result? Their welds had tiny oxygen bubbles, and they had to redo 20 hours of work, costing them way more than they saved on the gas. That’s why quality control is non-negotiable for my business—we test every batch of nitrogen before delivery, and we keep detailed records of purity for every order, so our clients can prove compliance with industry regulations.
At the end of the day, industrial nitrogen production is all about taking something abundant (air) and refining it to meet the specific needs of businesses across every sector. Whether it’s a small café making cold brew or a global pharmaceutical company making life-saving drugs, the process is rooted in simple physics and chemistry, scaled up to keep the world moving. As a nitrogen supplier, I’m not just delivering a gas—I’m delivering a critical component that keeps production lines running, food safe, and products reliable.
If you’re in need of nitrogen for your business—whether it’s a small operation just starting out or a large facility looking to upgrade your supply—reach out to us for a consultation. We’ll walk you through your options, answer all your questions, and help you find a solution that fits your needs and your budget.
Oxygen References
- Gas Processors Suppliers Association. (2020). “Cryogenic Air Separation Processes.” GPSA Engineering Data Book.
- American Society of Mechanical Engineers. (2021). “Pressure Swing Adsorption for Industrial Gas Separation.” ASME Journal of Engineering for Gas Turbines and Power.
- U.S. Energy Information Administration. (2022). Industrial Energy Use in Manufacturing: Specialty Gases.
- Food and Agriculture Organization of the United Nations. (2021). Nitrogen Usage in Food Preservation and Processing.
Fortune Gas Co., Ltd.
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