Adsorption | Rotary-bed Adsorber

Because of difficulty of ensuring that the solid moves steadily and at a controlled rate with respect to containing vessel. Other equipment has been developed in which solid and vessel move together, relative to a fixed inlet for the feed and fixed outlet for the product.Following below picture shows the principle of operation of a rotary-bed adsorber used.

 Construction Parts:

Following are the construction parts of the rotary-bed adsorber

1. Steam

2. Solvent

3. Rotor drive

4. Air filter

5. Solvent laden air

6. Motor

7. Water

8. Solvent vapour

9. Fan

10. Air cooler

11. Storage drain

Working Principle:

For example, for solvent recovery from air on to activated-carbon. The activated-carbon is contained in a thick annular layer, divided into cells by radial partitions. Air can enter trough most of the drum circumference and passes though the carbon layer to emerge free of solvent. The clean air leaves the equipment through a duct connected along the axis of rotation. As the drum rotates the carbon enters a section in which it is exposed to the steam.Steam flows from the inside to the outside of the annulus so that the inner layer of carbon. Which determines the solvent content of effluent air, is regenerated as thoroughly as possible. Steam and solvent pass to the condensers and the solvent recovered, either by decanting or by a process such as distillation. In the particular equipment shown, there is no separate provision for cooling the regenerated adsorbent, instead it is allowed to cool in contact with vapour-laden air and the adsorptive capacity may be lower as a result.