Solvent recovery with adsorption wheels

The rotary bed adsorber (also called adsorption wheel) provides a truly continuous TSA system. It uses a shallow wheel-shaped adsorption bed that continuously turns about an axis inside a fixed supporting frame. A section of the wheel is continuously used for adsorbing impurities from a gas while the other section is continuously regenerated by heating it with an impurity free gas. The adsorbent is made from a honeycomb-shaped alumina substrate that can be coated with layers of silica gels, activated carbons, or zeolites [14], It has been used for gas dehumidification, solvent vapor recovery, VOC removal, and deodorization of a gas stream. 

Adsorptive solvent removal of the solvent-mixture by use of an adsorption wheel (Figure 21.1.20) and solvent recovery via condensation has been technically and economically proven. 10,000 to 65,000 Nm /h of exhaust air from printing machines and washing plants at a temperature maximum of 45°C and a maximum solvent loading of 4.6 g/m is to be cleaned. Depending on the air volume two adsorption wheels with a capacity of 26,000 Nm /h and 39,000 Nm /h and separate desorption circuits are used either altema-... 

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