Thermal-swing adsorption

Desorption Displacement desorption Gas separation adsorption Liquid separation adsorption Pressure swing adsorption Thermal swing adsorption asbestos fibers, 3 304 for bioremediation, 3 782 capillary condensation, 1 585, 591 dessicants and, 3 375-377 detergency and, 3 428 129 in dispersions, 3 707 filler measurement via, 22 571 general separation heuristics for,... 

Steps. Thermal-swing cycles have at least two steps, adsorption and heating. A cooling step is also normally used after the heating step. A portion of the feed or product stream can be utilized for heating, or an independent fluid can be used. Easily condensable contaminants may be regenerated with noncondensable gases and recovered by condensation. Water-iminiscible solvents are stripped with steam, which may be condensed and separated from the solvent by decantation. Fuel and/or air may be used when the impurities are to be burned or incinerated. 

Regenerative adsorption units can be operated by a thermal-swing cycle, pressure-swing cycle, displacement-purge cycle, or inert-purge cycle. Combinations of these are frequently employed. 

Do Not Require Process Modifications iv. Thermal swing adsorption V. Pressure swing adsorption... 

A temperature-swing, or thermal-swing, adsorption (TSA) process cycle is one in which desorption takes place at a temperature much higher than adsorption. The elevation of temperature is used to shift the adsorption equilibrium and affect regeneration of the adsorbent. Figure 16-38 depicts a simplified (and ideal) TSA cycle. The feed fluid containing an adsorbate at a partial pressure of p1 is passed through an... 

While adsorption equiUbrium considerations do justify the possibility to regenerate an adsorbent bed completely and to uniform levels, this is rarely achieved in practice in either thermal swing adsorption and is almost never the case in pressure swing adsorption. Some residual sorbate is always left on the sorbent and in general, except for TSA with only one or two sorbates, the residual loadings are almost always found as a non-uniformly distributed profile across the length of the bed. 

Thermal swing adsorption (TSA) has been practiced with zeoHte molecular sieves for more than 50 years. In the following sections 1 discuss design methods and provide some reference data so that the design process can be understood. 

For evaluation of the rotor, thermal swing adsorption was tested in a static adsorption / desorption test equipment and proper type of adsorbent for target VOC s was determined. 

It has been known that condensation pressure depends on the adsorbate, temperature, pore size, and geometry of sorbent. As increasing temperature, the capillary condensation pressures is increased and adsorption capacity is decreased. This fact implies that adsorption and desorption can be easily achieved by only little adjustment of pressure and temperature. Therefore the effective removal of VOC can be done by pressure swing adsorption (PSA) or thermal swing adsorption (TSA) processes. 

The range of applications for gas and liquid separation and purification by adsorption is large and growing. The strong research and development activity in this area is facilitated by the flexibility of practical adsorptive process designs such as pressure and thermal swing adsorption, and SMB adsorption, as well as by the availability of a large spectrum of new and old micro-and mesoporous adsorbents. 

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