Introduction
Industrial gases such as oxygen, nitrogen, and argon are fundamental resources supporting modern industry. They are widely applied across sectors including metallurgy, chemical processing, energy production, electronics manufacturing, healthcare, and food preservation. To meet large-scale industrial demand, these gases are often produced continuously and stored in cryogenic liquid form for efficient transportation and utilization.
Behind this stable supply lies one essential technology - the Air Separation Unit (ASU).
So how are industrial gases actually produced? And how can companies ensure reliable, efficient, and safe gas generation systems?
Leveraging extensive experience in cryogenic gas engineering and industrial resource integration, NEWTEK provides advanced air separation equipment and customized technical solutions, supporting customers from system planning and equipment configuration to commissioning support and long-term operation optimization.
1. What is an Air Separation Unit (ASU)?
An Air Separation Unit (ASU) is a large-scale cryogenic system designed to separate atmospheric air into high-purity industrial gases. The process utilizes differences in boiling points between air components to achieve precise separation through low-temperature distillation.
Based on mature cryogenic separation principles derived from the Linde process, the ASU operation includes several key stages:
Air Compression and Purification
Ambient air is first filtered and compressed to the required pressure level. Heat generated during compression is removed through cooling systems. The compressed air then passes through purification units where impurities such as moisture, carbon dioxide, and hydrocarbons are removed.
This stage is critical because residual impurities may freeze under cryogenic temperatures and block equipment, potentially affecting safety and operational stability. Therefore, high-precision measurement and control instruments are essential for reliable system operation.
Cooling and Liquefaction
Purified air enters the cryogenic section known as the cold box. Through expansion via turbo expanders, the air temperature rapidly drops to approximately –170°C, causing liquefaction.
Distillation and Gas Separation
Liquefied air flows into multi-stage distillation columns where separation occurs through continuous heat and mass transfer.
Because each gas has a different boiling point:
Nitrogen: –196°C
Argon: –186°C
Oxygen: –183°C
the gases naturally separate at different levels within the column.
Oxygen concentrates in liquid form at the lower section
Nitrogen accumulates at the upper section
Argon is extracted through dedicated separation stages
This enables production of high-purity industrial gases suitable for demanding applications.
Product Output and Storage
Separated gases can be:
Delivered directly via pipeline systems, or
Liquefied and stored in cryogenic tanks for transportation.
Flexible output configurations allow the system to adapt to various industrial consumption models.
Precision Measurement and Control
Air separation systems require extremely stable monitoring under ultra-low temperatures. Typical instrumentation includes:
Cryogenic level gauges
Flow meters with temperature and pressure compensation
Differential pressure transmitters
Ultrasonic flow measurement systems
These ensure accurate metering and continuous operational safety even under rapid vaporization conditions.
Our Equipment
2. Industrial Applications of Air Separation Units
The gases produced by ASUs serve as essential process media across multiple industries.
Metallurgical Industry
Oxygen enhances combustion efficiency in steelmaking converters and electric furnaces, improving productivity and product quality. Nitrogen acts as a protective atmosphere to prevent oxidation at high temperatures.
Chemical and Petrochemical Industry
Oxygen supports oxidation reactions and gasification processes, while nitrogen is widely used for pipeline purging, inerting, catalyst protection, and safe material handling.
Medical and Healthcare Applications
Medical oxygen systems provide reliable respiratory support in hospitals and healthcare facilities, ensuring continuous and stable oxygen supply.
Food and Beverage Industry
Nitrogen is used for modified atmosphere packaging and beverage bottling to prevent oxidation. Liquid nitrogen enables rapid freezing, preserving food quality and texture.
Electronics Manufacturing
High-purity gases are essential in semiconductor production processes such as photolithography, etching, and chemical vapor deposition.
Energy and Environmental Applications
Oxygen-enriched combustion improves fuel efficiency and reduces emissions in power plants and industrial boilers, while supporting cleaner waste treatment processes.
3. NEWTEK Gas Engineering Solutions and Equipment Integration Capabilities
Air separation projects involve complex technical coordination, strict safety standards, and precise system integration. NEWTEK focuses on delivering reliable equipment solutions combined with engineering expertise, helping customers build efficient gas production systems tailored to their operational needs.
Customized System Design
NEWTEK develops optimized configurations based on:
Gas type requirements
Purity levels
Production capacity
Pressure conditions
Industry application scenarios
By integrating proven cryogenic technologies and advanced process concepts, we help customers achieve energy-efficient and stable plant performance.
Equipment Integration and Supply Coordination
NEWTEK works closely with qualified global manufacturers to provide coordinated supply of key equipment, including:
Air compressors
Turbo expanders
Distillation columns
Heat exchangers
Cryogenic storage systems
Precision instrumentation
All equipment undergoes strict quality verification processes such as helium leak testing and non-destructive inspection to ensure long-term reliability.
Technical Support and Commissioning Assistance
Beyond equipment delivery, NEWTEK provides technical guidance covering:
System installation support
Performance verification
Operational parameter optimization
Operator training assistance
After-sales technical consultation
This ensures smooth system startup and stable long-term operation.
Conclusion
Industrial gases are indispensable to modern manufacturing and energy systems, and air separation technology remains the most efficient method for large-scale gas production.
Through advanced air separation equipment, strong technical integration capabilities, and industry-focused engineering expertise, NEWTEK helps customers establish reliable, efficient, and scalable industrial gas solutions.
By combining technology, equipment coordination, and practical operational experience, NEWTEK supports industries worldwide in achieving stable gas supply, improved efficiency, and sustainable industrial development.
