Thermal swing adsorption process

Figure 5.18 Basic thermal swing adsorption process (redrawn from Keller et al. 1987, p. 655).

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... 

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. 

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. 

Thermal swing adsorption (TSA) processes for removal of trace water from gases and liquids... 

Concentration swing adsorption (CSA) and concentration-thermal swing adsorption (CTSA) processes for drying bulk liquid mixtures... 

Cyclic adsorption processes Two examples (a) thermal swing adsorption -maximization of total adsorption efficiency and minimization of consumption rate of regeneration energy, and (b) rapid pressure swing adsorption -maximization of both purity and recovery of the desired product for RPSA. Modified Sum of Weighted Objective Function (SWOF) method Modified SWOF method is superior to the conventional SWOF as it was able to find the non-convex part of the Pareto-optimal set. Ko and Moon (2002)... 

Air Liquide and ConocoPhilUps report that a membrane system in Indonesia installed in 1998 processed 310 MMSCFD (9300000mVday) of natural gas, reducing CO2 from 30% to 15% [15], The polyimide hollow fibres are protected from heavy hydrocarbons through pre-treatment of the inlet gas with a thermal swing adsorption unit utilizing silica gel. 

Adsorption and desorption are, respectively, exothermic and endothermic processes. Consequently, all practical adsorptive gas separation processes such as pressure swing adsorption (PSA) and thermal swing adsorption (TSA) are non-... 

An alternative mode of operation of this process has also been developed where the air drying and air separation duties of the RPSA process are decoupled [20]. The RPSA process, in this case, is operated using a lower feed air pressure (Pa=2.1 atmosphere) and the air is pre-dried using a conventional thermal swing adsorption (TSA) unit. This option reduces the cost of the O2 product. 

The term parametric pumping was coined by Wilhelm et al. [Wilhelm, Rice, and Bendelius, Ind. Eng. Chem. Fundam., 5,141-144 (1966)] to describe a liquid-phase adsorption process in which separation is achieved by periodically reversing not only flow but also an intensive thermodynamic property such as temperature, which influences adsorptivity. Moreover, they considered the concurrent cycling of pressure, pH, and electrical and magnetic fields. A lot of research and development has been conducted on thermal, pressure, and pH driven cycles, but to date only gas-phase pressure-swing parametric pumping has found much commercial acceptance. 

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