PSA Adsorbent

Pressure swing adsorption (PSA) is a method that make use of the characteristic that adsorbent differs in adsorption capacity, adsorption rate and adsorption power regarding different components in gas mixture, and the characteristic that adsorption capacity of adsorbent differs with change of pressure regarding different components in gas mixture to achieve mixed gas separation in pressure.

Important physical characteristics of adsorbent include pore volume, pore diameter distribution, surface area and surface properties. Because of different pore size distribution, different specific surface area and different surface properties, adsorbent has different adsorption capacity regarding different components in gas mixture.

To achieve effective separation, the adsorbent separation coefficient for each component in a gas mixture needs to be as large as possible. The larger the separation coefficient, the easier it is to separate different components. In general, the separation coefficient should not be less than 3.

In addition, the contradiction between adsorption and desorption should be considered. The easier adsorption is, the more difficult desorption will be. For strong adsorption components, relatively weak adsorption agent should be selected, and for week adsorption components, strong adsorption agent should be selected to make adsorption capacity bigger and separation coefficient higher. 

Besides, due to periodic variation of pressure in the adsorption tower during adsorption process, adsorbent suffers frequent flushing of gas flow, so adsorbent must be strong enough and resistant upon abrasion.

Performance of adsorption agent affects PSA results directly. Currently used PSA adsorbent are mainly activity alumina, active carbon, silica gel and molecular sieve adsorption agent. There are also special adsorption material developed to selectively absorb a specific component, such as special adsorbent for CO, and carbon molecular sieve.

UNE has developed adsorption agent and absorption solvent with excellent performance for different usage. They have been applied in chemical, metallurgical, petrochemical, machinery, electronics and food industries.

For the production of food grade carbon dioxide, we developed adsorbents to remove aldehyde and ether, and adsorbents to remove hydrocarbons. We also successfully developed a load type active precious metal that can separate carbon dioxide from similar impurity gas.

In addition, we developed many high performance adsorbents that are specially used for removal of benzene, naphthalene and mercury, and for dehydration and desulfurization.

A large number of industrial applications demonstrate that these adsorbents has high performance and can remove impurities very well. At the same time, their strength is high and can serve more than 5 years, making the whole process reasonable and efficient.