By using multiple technologies, mainly PSA(Pressure Swing Adsorption), UNE provide clients many solutions and equipment set for purification and separation of natural gas, coal gas, coke oven gas and other kinds of gas.

PSA has merits of low energy consumption, small investment, simple procedure, easy to operation, high reliability, and environment friendly.

The mechanism of PSA is to make use of the characteristic of adsorption discrepency between different components of gas, and  the characteristic of the change of the amount of adsorption with the change of pressure. Gas purification and separation is achieved by periodically changing pressure.

PSA has been used in following 9 areas:

1. Hydrope purification;

2. CO₂ purification, food grade CO₂ can be produced directly；

3. CO purification;

4. Converted gas purification;

5. Natural gas purification;

6. Air separation to produce hydrope;

7. Air separation to produce N₂;

8. Gas concentration to produce CH₄；

9. Concentrate and purificate ethene.