VPSA Oxygen Plant

Vacuum Pressure Swing adsorption System

 Vacuum Pressure Swing Adsorption (VPSA) segregates certain gases from a gaseous mixture at near ambient pressure; the process then swings to a vacuum to regenerate the adsorbent material. VPSA differs from other PSA techniques because it operates at near-ambient temperatures and pressures. VPSA typically draws the gas through the separation process with a vacuum. For oxygen and nitrogen VPSA systems, the vacuum is typically generated by a blower. Hybrid Vacuum Pressure swing adsorption (VPSA) systems also exist. VPSA systems apply pressurized gas to the separation process and also apply a vacuum to the purge gas. VPSA systems, like one of the portable oxygen concentrators, are among the most efficient systems measured on customary industry indices, such as recovery (product gas out/product gas in) and productivity (product gas out/mass of sieve material). Generally, higher recovery leads to a smaller compressor, blower, or other compressed gas or vacuum source and lower power consumption. Higher productivity leads to smaller sieve beds. The consumer will most likely consider indices which have a more directly measurable difference in the overall system, like the amount of product gas divided by the system weight and size, the system initial and maintenance costs, the system power consumption or other operational costs, and reliability.

The Process

The production of gases with the aid of the adsorption technology is based on the capability of porous adsorption agents to bind gases the individual constituents of the gas mixture are adsorbed to differing degrees on the very large surfaces of the adsorbent agents. this effect is used within a Vacuum pressure swing adsorption process to continuously separate out one constituent from a feed gas mixture or feed air.

Zeolite Molecular Sieves are used as adsorption agents when producing oxygen from the air by adsorptive means they adsorb nitrogen, water vapor and carbon dioxide to a much higher degree than oxygen this means that a product flow comprising essentially only oxygen and argon can be removed from the process air being passed through the adsorption bed, for higher outputs third bed is provided.

The compressed air enters Absorbers and Nitrogen is absorbed while the oxygen product leaves the vessels after a certain time the adsorption is interrupted and evacuation by a vacuum pump desorbs the enriched nitrogen gas. The oxygen product flow is compressed to the required discharge pressure, if required and fed to end use process


  • Economics

Cost saving in the range of 40-60% over liquid supply Systems and up-to 80% for Cryogenic Plant.

  • Highest Reliability

The VPSA system provides the highest reliability the control system allows for the production of oxygen at the specified flow & purity within a short time of demand using a simple push button. this on/off operating capability is not available from cryogenic plants.

  • Easy Partial Load Operation

The plant is automatically adjusted to the actual product flow requirement and operates in an energy-saving partial load mode.

  • Energy Efficiency

Lower energy consumption than cryogenic units.

  • Fully Automatic Operation

PLC-based control system controls the purity and the flow by automatically adjusting the cycle time of the VPSA system.

  • Remote control

A  ProfNet or LAN port is provided for the communication with complete Plant Directional Control System with optional Modem Board for Remote Control.

Plant Unique Features

  • Completely Pre-Piped & Skid Mounted.
  • Containerized Shipments right from factory.
  • Critical process parameters monitored and
  • Recorded every 500 milliseconds.
  • Automatic turndown capability from 100% to 0% flow capacity.
  • Designed in accordance with local standards.
  • Automatic and unattended operation.
  • On-site start-up assistance by Hi-Tech’s Engineered Solutions technicians anywhere in the world.

Typical Applications

Oxygen VPSA Plants supplied by Hi-Tech Engineered Solutions range in the size of a few 50 Nm3/hr up to 600 Nm3/hr with an oxygen product purity of ranging from 90% ~ 95% V/V.

For many Processes using oxygen rather than air reduces vent gas quantities and reduces energy and capital cost requirements.

  • Metal Industry

Furnaces in lead, copper and zinc industry.

Oxygen-Fuel Burners.

Chemical leaching for minerals extraction.

Uranium Recovery.

  • Pulp and Paper industry

Oxygen bleaching and oxidation.

  • Chemical Industry

Chemical oxidation reaction using oxygen reduces. Vent gas quantities and hence energy and capital cost.

  • Water and Waste Water treatment

Oxygenation and Ozone Treatment.

  • Glass Industry

Furnace enrichment oxygen burners have a much more intense flame, So the heat transfer is greater & furnace can be smaller and less fuel is consumed.

  • Hospital

For artificial respiration.

Technical Specifications

Our VPSA System from 79 to 526 NM³/hr of oxygen. Use the following table to determine which model is most suitable to your application.

Optional 99% purity or Higher working pressures

-Custom Built Models Also Available

-All Plants 0.41 kWh ±5% per Nm³ of total flow, nominal 93% oxygen at 0.21 Bar G

Oxygen Outlet pressure at maximum plant capacity.



Capacity SCFH


Building Size 





32 x 24 x 20 ft.(9.8 x 7.3 x 6.1 m)




35 x 24 x 20 ft.(10.7 x 7.3 x 6.1 m)




38 x 24 x 20 ft.(11.5 x 7.3 x 6.1 m)




42 x 24 x 20 ft.(12.8 x 7.3 x 6.1 m)




50 x 28 x 22 ft15.2 x 8.5 x 6.7 m)




58 x 33 x 25 ft.(17.7 x 10.1 x 7.6 m)

Note- Specifications are subject to change without prior notice.