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WhatsApp / Mob : +86 156 5177 2521
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Email : mrwin@cnbangwin.com
WhatsApp / Mob : +86 156 5177 2521
Email : mrwin@cnbangwin.com
Air Separation Unit (ASU): Technology for Industrial Gas Production
Mar 11 , 2026Industrial oxygen, nitrogen, argon and other gases are used throughout modern manufacturing processes. Steel plants, chemical manufacturers, and electronics companies need reliable access to these gases. As a result, large-scale industrial gas production systems have been developed.
Air Separation Units (ASUs) are pieces of equipment that can fractionate air into its major components. Through cryogenic processes these industrial facilities produce bulk quantities of very pure gases.
Nanjing Bangwin Gas manufactures state-of-the-art ASU systems that allow for dependable industrial gas production.
Recommended internal pages:
l Cryogenic Air Separation Plant
l Liquid Nitrogen Generation Plant
An Air Separation Unit is a facility or piece of equipment that can divide air into its primary components. Those primary components are:
l Nitrogen (N₂)
l Oxygen (O₂)
l Argon (Ar)
Typically these units use cryogenic distillation to fractionate the air. During this process the air is cooled until it liquefies. Then, since the three elements have different boiling points, they can easily be separated in distillation columns.
Air separation units can be used to provide gases in liquid form or as a gas.
The process in an ASU is accomplished by several controlled steps.
Compression of Air
Outside air is fed into compressors that pressurize the air before it goes into the purification step.
Purification of Air
Air contaminants like water vapour, carbon dioxide and hydrocarbons are removed from the air stream. This is done so that these impurities won't freeze when the air goes through cryogenic cooling.
Cooling Below −180°C
Once purified, the air goes through heat exchangers that remove heat from the air and turn it into liquid form.
Fractional Distillation
The liquid air then goes through distillation columns where individual gases are separated in accordance to their boiling points.
l Nitrogen boils at −196°C
l Argon boils at −186°C
l Oxygen boils at −183°C
Gas Storage/Delivery
Separated gases are stored in cryogenic tanks for liquid service or sent as pipeline gas.
There are many main systems in a conventional Air Separation Unit.
l Precompression system of air compressor
l Air drying system
l Main heat exchanger
l Cold box
l Rectification column
l Liquid oxygen storage tank
l Liquid nitrogen storage tank
l Argon recovery unit
l Control system and automation system
Each system provides uninterruptible separation of air gases.
There are three types of Air Separation Units depending on demand.
l Large Cryogenic Air Separation Unit
Large capacity plants produce oxygen and nitrogen for steel mills or petrochemical plants.
l Medium Industrial Air Separation Unit
Medium-sized facilities are used in manufacturing plants and industrial zones.
l Compact Modular Air Separation Unit
The modular design cuts down installation period.Due to its modular nature, installation time is greatly reduced. It is used to supply medium scale quantities of gases.
There are various benefits to having ASUs.
Purity of Product Gases
Oxygen purities higher than 99.6% and nitrogen purities higher than 99.999% can be achieved by cryogenic separation.
Massive Amounts of Gas
Air separation units can create thousands of cubic meters of gas every hour.
Ability to Produce Multiple Gases
Systems can be used to produce oxygen, nitrogen, and argon all at once.
ASUs can run for years without shutting down and will provide a consistent amount of gases at all times.
Many industries rely on Air Separation Units.
Some of the larger ones include:
l Steel manufacturing and metal fabrication
l Petroleum processing
l Chemical production
l Electronics
l Glass manufacturing
l Medical oxygen
l Power plants
These industries and more require huge quantities of gas, making ASUs a valuable asset.
As for selecting an ASU unit, you should consider various factors.
Gas Capacity
Determine the production capacity based on the daily consumption of your site.
Gas Purity
Ultra-high purity gas is needed for special industries.
Electric Consumption
Electricity cost greatly influences your total operation cost.
Installation Requirement
Space and facility available also determine the layout of the plant.
It is wise to work with an experienced manufacturer who can guide you to choose the most suitable system.
At Bangwin, We Are Professional Industrial Gas Equipments Supplier & Air Separation Technology
l Provide air separation unit(ASU)
l Cryogenic air separation plant
l VPSA oxygen plant
l PSA oxygen generator
l Nitrogen generator
l Cryogenic storage tank
Find our complete solution here �� https://bangwingas.com/
Complete engineering support including design, fabrication, installation, commissioning.
Authoritative industry resources:
l Air Liquide Industrial Gas Technologies
https://www.airliquide.com
l Linde Engineering Cryogenic Systems
https://www.linde-engineering.com
Q1: What are the gases produced by Air Separation Unit (ASU)?
A1: Oxygen, nitrogen and argon are the main gases separated by an ASU.
Q2: What technology is an ASU based on?
A2: Most air separation units are based on cryogenic distillation technology.
Q3: Which industries use ASUs?
A3: Steel manufacturers, Petrochemical plants, Electronics manufacturers, Hospitals.
Q4: Can an ASU produce liquids?
A4: Yes, it is possible to produce LOX, LIN and LAr with an ASU.
Q5: Does Nanjing Bangwin Gas offer turnkey projects for ASUs?
A5: Yes, we offer engineering, manufacture, installation and commissioning services.
Air Separation Units (ASU) provide large quantities of industrial gases. These plants separate oxygen, nitrogen and argon using cryogenic separation technology.
Increase your reliability and efficiency with Nanjing Bangwin Gas’ state of the art equipment.
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