Deoxo nitrogen · Ultra-high purity, made in India
Deoxo nitrogen generators and purifiers
A Deoxo nitrogen purifier removes the oxygen a PSA nitrogen plant leaves behind. Hydrogen reacts with it over a palladium catalyst to form water, a dryer takes the water out, and the nitrogen leaves with oxygen at ppm level, up to 99.9999% pure. Gastek builds the PSA plant and the purifier, or adds a purifier to the plant you have.
- Nitrogen up to 99.9999%, specified as oxygen in ppm
- Palladium Deoxo, or copper where no hydrogen may reach the process
- Dryer, oxygen analyser and off-spec vent built in
- Purity
- To 99.9999%
- Oxygen
- ppm level
- Catalyst
- Pd or Cu
Since 1993
Gas generation plants designed and built in India
PSA plant and purifier
Gastek builds both, so one supplier answers for the oxygen figure
New plant or retrofit
A purifier after a new PSA plant, or after the one you have
D-U-N-S 91-686-7372
ISO 9001:2015 quality management
How it works
How does a Deoxo nitrogen purifier work?
The PSA plant does the bulk separation from air. The Deoxo stage turns the oxygen that is left into water, and the dryer takes the water out.
Grey is PSA nitrogen, blue is hydrogen, red is nitrogen after the oxygen is gone. Dryer A dries while B regenerates, then they swap.
01
PSA nitrogen in
A PSA nitrogen plant delivers nitrogen with a small amount of oxygen left, measured in hundreds or thousands of ppm. Its purity is chosen together with the purifier.
02
Meter the hydrogen
Each volume of oxygen needs two volumes of hydrogen, so 1,000 ppm of oxygen takes 2,000 ppm of hydrogen. The dosing follows the flow and the oxygen reading, with a small excess.
03
React over palladium
In the Deoxo vessel, hydrogen and oxygen combine over a palladium catalyst to form water vapour: 2H₂ + O₂ → 2H₂O. The reaction gives off heat, which is why the PSA plant removes the bulk of the oxygen first.
04
Cool and separate
The warm nitrogen passes through a cooler and a separator, which drain off most of the water the reaction made.
05
Dry the nitrogen
Twin desiccant towers dry the nitrogen to the dew point the process needs, one drying while the other regenerates.
06
Check and deliver
An oxygen analyser watches the product line. If the oxygen goes over the limit, the gas is vented instead of reaching the process.
Specifications
Deoxo nitrogen purifier specifications
Ranges, not simultaneous guarantees: oxygen, dew point, flow and pressure are agreed together for each project, at the point where you measure them.
Deoxo nitrogen purifier · specificationsRanges, agreed per project
Nitrogen out
- Purity
- Up to 99.9999%, specified as oxygen in ppm
- Oxygen
- ppm level, set for the duty and checked by an online analyser
- Hydrogen
- A small residual with palladium Deoxo; none from a copper bed
- Dew point
- −40 °C to −60 °C or drier, set by the dryer
- Flow
- Sized to the PSA plant it follows
Package
- Feed
- Nitrogen from a PSA plant, new or existing; membrane nitrogen reviewed per duty
- Catalyst
- Palladium for hydrogen Deoxo; copper for hydrogen-free purification
- Hydrogen
- Cylinders, site supply or a Gastek hydrogen generator
- Drying
- Cooler, separator and twin desiccant towers
- Controls
- PLC, oxygen analyser, hydrogen ratio control, alarms and off-spec vent
Purity
When do you need a Deoxo purifier?
When the oxygen limit sits beyond what a PSA plant alone delivers. Drawn in nines, so each step to the right leaves ten times less oxygen.
Gastek routes
Membrane
Compact; nitrogen as soon as air flows
95–99.5%
PSA
The base plant for most duties
95–99.999%
PSA with Deoxo
Oxygen at ppm level
to 99.9999%
Duties at the top of the range
Solar diffusion and LPCVD
Carrier gas, purging, annealing
99.999% and up
Vacuum furnace backfill
Gas quenching of bright parts
99.99–99.999%
Bright annealing and brazing
Nitrogen and N₂–H₂ atmospheres
99.99–99.999%
Vials and freeze dryers
Headspace, filling and backfill
99.99–99.999%
Typical ranges from Gastek's industry pages. Where a duty sits at the top of its range, or the limit is written in ppm of oxygen, compare a higher-purity PSA plant with PSA and Deoxo.
Technology selection
Palladium Deoxo or copper Deoxo?
Both take the oxygen to ppm level. The question is whether the process can accept a trace of hydrogen in the nitrogen.
| Compare | Palladium Deoxo | Copper Deoxo |
|---|---|---|
| How the oxygen goes | Reacts with dosed hydrogen over the catalyst to form water | Bonds to hot copper as copper oxide |
| Hydrogen in the product | A small residual, from the excess dosed | None reaches the product |
| Hydrogen use | Continuous, two volumes per volume of oxygen, plus the excess | Only to regenerate the copper bed |
| Vessels | One catalyst vessel, then the cooler and dryer | Two beds: one purifies while the other regenerates |
| Choose it for | Heat treatment, brazing, soldering and processes that run on N₂–H₂ anyway | Pharma, specialty chemicals, analysers and any process where hydrogen is a risk |
Applications
Where is Deoxo nitrogen used?
Where the oxygen limit is written in ppm: hot metal, solder, wafers and oxygen-sensitive chemistry. Each duty links to its own page.
Palladium · hydrogen welcome
Heat treatment and metals
Bright annealing, brazing, sintering and vacuum-furnace backfill, where traces of oxygen tint or scale the parts and a little hydrogen does no harm.
Deoxo nitrogen for heat treatmentPalladium · ppm oxygen
Electronics, SMT and PCB
Reflow, wave and selective soldering, where lower oxygen means better wetting and less dross.
Deoxo nitrogen for electronics99.999% and up
Solar cells and semiconductors
Diffusion, LPCVD and load-lock purging, where oxygen and moisture show up as defects in the cells.
Nitrogen for solar cellsCopper · hydrogen-free
Pharmaceuticals and APIs
Oxygen-sensitive APIs, isolators, vials and freeze-dryer backfill, where hydrogen in the gas is not wanted.
Nitrogen for pharmaCopper · hydrogen-free
Specialty chemicals
Catalysts, monomers and additives that degrade or discolour with oxygen, blanketed with hydrogen-free nitrogen.
Nitrogen for chemical plantsPoint of use
Laboratories and glove boxes
Glove boxes, analysers and research rigs that need a steady supply of very low-oxygen nitrogen.
Ask about laboratory use
Sizing
What sets the size of a Deoxo system?
The oxygen in, the oxygen out and the flow. Together they set the PSA purity, the hydrogen use, the catalyst and the dryer.
Send us
- Nitrogen flow, with the peak
- The oxygen limit in ppm, and where it is measured
- Dew point and pressure at the use point
- Whether any hydrogen may reach the process
- Your hydrogen supply, if you have one
- For a retrofit: the PSA plant's flow, purity and pressure
Ask every offer to state
- Oxygen guaranteed at the outlet, in ppm, at your flow
- Feed purity from the PSA plant, and why it was chosen
- Hydrogen use in Nm³/hr, and the residual hydrogen
- Dew point, and the dryer's regeneration loss
- What happens when the oxygen goes off-spec
Specify oxygen in ppm, not a purity percentage
99.999% allows 10 ppm of everything that isn't nitrogen. Write the oxygen limit your process actually has, and where it is measured, so every offer is sized to the same figure.
Deoxo nitrogen FAQ
Deoxo nitrogen purifier questions
What is a Deoxo nitrogen purifier?
A Deoxo nitrogen purifier, or nitrogen purifier, removes the oxygen left in nitrogen from a PSA or membrane plant. In the usual palladium Deoxo, hydrogen is added and reacts with the oxygen over the catalyst to form water vapour, which a cooler and dryer remove. The result is ultra-high purity nitrogen, up to 99.9999%, with oxygen at ppm level.
What is the difference between a Deoxo nitrogen generator and a PSA nitrogen generator?
A PSA nitrogen generator separates nitrogen from compressed air and reaches up to 99.999%. A Deoxo nitrogen generator is a PSA plant followed by a Deoxo purifier, which removes the oxygen that remains, for up to 99.9999%. Gastek builds both, so the purity of the PSA plant and the size of the purifier are chosen together.
Should I choose palladium Deoxo or copper Deoxo?
Palladium Deoxo uses dosed hydrogen and leaves a small residual of it in the nitrogen, which suits heat treatment, brazing and soldering. Copper Deoxo captures the oxygen on a hot copper bed, so no hydrogen reaches the product; the bed is regenerated with hydrogen while a second bed takes over. Choose copper when hydrogen is a risk to the process.
How much hydrogen does a Deoxo purifier use?
Two volumes of hydrogen for each volume of oxygen removed, plus a small excess. Nitrogen with 1,000 ppm of oxygen therefore needs about 2,000 ppm of hydrogen, or 0.2 Nm³ for every 100 Nm³ of nitrogen. A purer PSA feed means less hydrogen, which is why the two are sized together.
Does a Deoxo purifier add moisture to the nitrogen?
Yes. Each volume of oxygen removed becomes two volumes of water vapour, so 1,000 ppm of oxygen turns into about 2,000 ppm of water. A cooler, separator and desiccant dryer take it out, and the dryer sets the final dew point, typically −40 °C to −60 °C or drier.
Can a Deoxo purifier be added to an existing PSA nitrogen generator?
Often, yes. Gastek reviews the existing plant's flow, purity, pressure and oxygen stability, then sizes the hydrogen dosing, catalyst and dryer to it. If the plant runs well below its rated purity, it may need attention first, since every ppm of oxygen it lets through costs hydrogen.
Where does the hydrogen come from?
From hydrogen cylinders, an existing site supply, or an on-site hydrogen generator. Gastek makes electrolytic hydrogen generators, so a plant can be supplied with its own hydrogen source.
Can a Deoxo plant replace liquid nitrogen?
For many ultra-high purity duties, yes. Compare the oxygen and dew point you actually need, your flow and hours, and the cost of liquid nitrogen deliveries against power, hydrogen and maintenance on site. Many sites keep a liquid or cylinder supply as backup.
How much does a Deoxo nitrogen plant cost in India?
The price follows the duty: nitrogen flow, the oxygen limit in ppm, palladium or copper, the dryer, the hydrogen source and the controls, and whether the PSA plant is new or already on site. Send the duty for a configured quotation.
Does Gastek export Deoxo nitrogen plants?
Yes. Gastek supplies PSA nitrogen plants with Deoxo purification from India to the Middle East, Africa and South and Southeast Asia, with sizing, documentation, export packing and commissioning support.
Next step
Send your oxygen limit. Get a purifier sized to it.
Share the flow, the oxygen limit in ppm and whether hydrogen may reach the process. Gastek replies with the PSA plant and Deoxo route that meets it.
Gastek contact hoursMon–Sat, 9:00 am–6:00 pm IST
- Nitrogen flow, and the peak
- Oxygen limit in ppm, and where it is measured
- Dew point and pressure at the use point
- Whether hydrogen may reach the process
- Existing PSA plant or hydrogen supply, if any