Argon Extraction in Large-Scale Cryogenic Air Separation Units

Argon, as the most abundant noble gas in the atmosphere, has stable chemical properties and is widely used in industrial manufacturing, electronics, medical treatment, food and beverage and other fields. Large-scale air separation units are often equipped with a full distillation argon production process to extract argon. This process extracts an argon-rich fraction from the upper tower of the air separation unit, and separates oxygen and nitrogen in turn through a crude argon tower and a refined argon tower to obtain high-purity argon. It has the characteristics of simple process, easy operation, high safety and high extraction rate. Currently, the supply of argon in some areas is limited, while downstream demand is gradually increasing. Configuring an argon system can improve the oxygen extraction rate of the air separation unit, reduce energy consumption, and flexibly adjust production. NEWTEK can provide full-chain services for argon extraction systems to help companies improve efficiency and competitiveness.

 

Basic Properties and Applications of Argon
 

Properties

Argon is a rare gas, the most abundant noble gas in the atmosphere. It is extremely chemically inactive, neither flammable nor combustion-supporting. It is a gas at room temperature and pressure, with stable physical and chemical properties.

Applications

Industrial Manufacturing: In metal welding, such as welding aluminum, magnesium, copper, their alloys, and stainless steel, argon can be used as a shielding gas, isolating the air from the welded parts to prevent oxidation or nitridation, thereby ensuring weld quality.

Electronics Industry: In the manufacturing of electronic components such as semiconductors and flat-panel displays, argon can be used as a carrier gas or shielding gas, providing a clean, controlled environment for the production process and preventing contamination that affects component performance.

Medical: In cryotherapy, argon utilizes its low-temperature properties to achieve rapid cooling, assisting in precise tumor targeting and treatment. It is also used in some medical imaging techniques to improve imaging quality.

Food and Beverages: Argon can be used in food and beverage packaging to create an inert environment, inhibiting microbial growth and oxidation reactions, and extending the shelf life of the product.​
 

Overview of Large-Scale Air Separation Units
 

 

Take the example of an air separation unit supporting a large-scale coal chemical project in a certain region. This type of unit typically uses ambient temperature molecular sieve adsorption purification technology to remove impurities from the air. It is equipped with an air booster system, and oxygen and nitrogen products are delivered via internal compression. The core separation unit of the unit utilizes a structured packing upper tower. If argon extraction is required, a full distillation argon production process is deployed. The air compressor is generally driven by an electric motor to ensure stable operation of the entire unit.

 

Process Flow and Characteristics of Argon Production

Process Flow - Full Distillation Argon Production

Full distillation argon production is the mainstream process for argon production today. The specific process is as follows: An argon-rich fraction is extracted from the lower middle portion of the upper tower of the air separation unit and introduced into a dedicated argon distillation system. First, oxygen and argon are separated in a crude argon tower, removing most of the oxygen in the argon-rich fraction to produce crude argon with a low oxygen content. This crude argon is then fed into a refined argon tower for further separation of the nitrogen component, ultimately yielding a high-purity argon product. [Insert simplified diagram of the full distillation argon production process here: Mark the argon-rich fraction extraction point (middle and lower portion of the upper tower), the crude argon tower, and the refined argon tower. Arrows indicate the flow paths, clearly indicating the production nodes of crude argon and high-purity argon.]
 

Features

The full distillation argon production process offers significant advantages: a simple process structure, eliminating complex auxiliary equipment; convenient operation, and stable operation achieved through automated control systems; reliable safety features, with no particularly hazardous process steps; and high argon extraction efficiency, fully utilizing the argon components in the air separation unit and improving resource utilization.
 

Argon Market Research and Analysis

Regional Air Separation Units and Argon Production Capacity

A survey of the air separation unit layout in a certain region revealed a large number of medium- and large-scale air separation units in operation, under construction, or planned. However, not all units are equipped with argon extraction systems. For those units already in operation with argon production capacity, actual argon production capacity has not been fully utilized due to factors such as inactivity or operating load, resulting in a relatively limited regional argon supply.​
 

Transportation Costs and Market Price Patterns

The cost of transporting liquid argon is directly related to transportation distance. The longer the distance, the higher the unit transportation cost, leading to price differences between different regions. Generally, prices in short-distance markets are smaller due to lower transportation costs. However, when the distance exceeds a certain range, the proportion of transportation costs increases significantly, and regional market price differences become more pronounced, increasing the likelihood of cross-regional circulation.

 

Market Demand Forecast

A certain region is located near the industrial zone of a provincial capital city, offering advantageous transportation. With the advancement of the local "Strengthening the Provincial Capital" strategy, manufacturing, especially electronics and photovoltaics, which have a high demand for argon, will accelerate its development. With the continuous expansion of downstream application scenarios, the market demand for argon is expected to gradually increase, providing a market foundation for the installation of argon extraction systems in local air separation units.
 

Risk and Energy Efficiency Analysis of Argon Productio

Production Risks

The fully distilled argon production process, currently widely used in industry, has been proven to be highly mature and has a stable process route. Under normal operation and maintenance, it does not increase the safety risks of the air separation unit and ensures the safe operation of the entire system.​
 

Energy Efficiency Analysis

Equipping an air separation unit with an argon system effectively improves oxygen extraction efficiency and reduces feed air consumption, thereby reducing the load on core energy-consuming equipment such as air compressors and achieving significant energy savings. Comparing configuration options, air separation units without an argon system typically have lower oxygen extraction rates and, to reduce energy consumption, typically require a booster tower. However, units equipped with an argon system not only produce argon product but also use the crude argon tower as a booster tower, further optimizing energy consumption. Furthermore, the argon system offers flexible adjustment capabilities, enabling the refined argon system to be switched in and out based on market demand, ensuring energy savings while enabling dynamic adjustments to the product mix.
 

NEWTEK 's Practical Value

 

The fully distilled argon production process used in argon production is mature and reliable. Equipping an air separation unit with an argon system not only improves oxygen extraction efficiency and reduces unit energy consumption, but also increases argon product output and optimizes the plant's product mix. It has become a mainstream and advanced configuration in the industry. NEWTEK is deeply engaged in the industrial gases and air separation sectors. Leveraging its expertise in process optimization, equipment integration, and system operations and maintenance, NEWTEK provides comprehensive services for argon extraction systems in large-scale cryogenic air separation units, from design and equipment selection to operational commissioning. Whether configuring argon systems for new installations or upgrading existing ones, NEWTEK tailors tailored technical solutions to project needs and market characteristics, helping companies improve argon production efficiency and reduce energy costs. NEWTEK also flexibly responds to changing market demands, further strengthening its competitiveness in the industrial gases sector and driving the industry's green and efficient development.