Adsorbents Solutions for Compressed Air Drying

- Jun 17, 2020-

Solutions for Compressed Air Systems

XR101 Activated Alumina

XR101 activated alumina is a smooth sphere of activated alumina produced by XIANGRUN’s unique manufacturing process. XR101 is an excellent adsorbent for drying a wide variety of liquids and gases. Although all molecules are adsorbed to some extent on XR101 activated alumina, those molecules having the highest polarity are preferentially adsorbed. Stream conditions such as pressure, concentration and molecular weight of the molecules, temperature and site competing molecules affect the efficiency of adsorption.


 heatless dryer desiccant


Applications: Compressed air adsorption drying

Today adsorption dryers are part of every modern compressed air and energy supply. In addition to the correct regeneration process, the adsorbent is the actual basic process component of each adsorption dryer and is responsible not only for the physical process of adsorption but also for the efficiency of the system.


Standard systems

Cold regenerated (heatless)

Cold-regenerated dryers (so-called heatless driers) function without heat but with a lot of compressed air. These pressure swing adsorption dryers require a partial flow of previously-dried air for regeneration. The changeover takes place after only a few minutes with low water adsorption of less than 1% by weight of the drying agent. Due to the high consumption of 12 to 25% dried compressed air depending on the operating pressure, relatively high energy costs result during operation.

Pressure dew point: -25 to -40 °C, -70 °C 

Adsorbent: Activated Alumina XR101, Molecular Sieve 4A


External heat regenerated (standard)

Standard adsorption dryers (externally heat-regenerated) are desorbed with externally heated fan air like the low energy variants. These are used if the demands on the efficiency are not too high. In contrast to the modern purgeless systems, a partial flow of compressed air (purge air) is normally required for cooling. The standard of these systems usually includes drying agents which require a significantly higher desorption temperature (170° to 200 °C.) and a larger quantity of dry regeneration air.

Pressure dew point: -25 to -40 °C

Adsorbent: Activated Alumina XR101