Adsorption single-stage

Single-Stage Adsorption Contact filtration can be carried out as a single-stage operation (Figure 10.8) either in a batch or a continuous mode. If we assume that the amount of liquid retained with the solid is negligible, the material balance for a solute gives... 

Single Stage Adsorption in a Vessel Adsorber with Adsorbent Packing... 

The schematic diagram for a single-stage adsorption is shown in Fig. 15.11. The solution to be treated contains V dm water, and the pollutant concentration is reduced from Q to C<., mg solute per gram of solution. The amount of adsorbent added is Af g of adsorbate free solid, and the solute concentration on the adsorbent increases from to q i mg solute per gram adsorbent. If fresh adsorbent is used, q = 0. The mass balance equates the solute removed from the liquid to that picked up by the solid. 

Illustration 7.1 Single-Stage Adsorption The Rectangular Operating Diagram... 

Figure 11.17 Single-stage adsorption, Freundlich equilibrium curves.

Hybrid Crystallization/Adsorption Process. In 1994, IFP and Chevron announced the development of a hybrid process that reportedly combines the best features of adsorption and crystallization (59,99). In this option of the Eluxyl process, the adsorbent bed is used to initially produce PX of 90—95% purity. The PX product from the adsorption section is then further purified in a small single-stage crystallizer and the filtrate is recycled back to the adsorption section. It is reported that ultrahigh (99.9+%) purity PX can be produced easily and economically with this scheme for both retrofits of existing crystallization units as well as grass-roots units. A demonstration plant was built at Chevron s Pascagoula refinery in 1994. 

For simplicity and reduced cost, an adsorption storage system using single stage compression is attractive, which puts a practical upper limit to the adsorption... 

In order to increase the recovery of adsorbate by adsorption, and to reduce the amount of adsorbent required to attain a specific recovery, a multistage adsorption operation can be used. In such an operation (as shown in Figure 11.3), a liquid solution is successively contacted at each stage with the adsorbent. In such a scheme, the relationship given by Equation 11.7 can be applied to each stage, with assumptions similar to the single-stage case, and the concentration ofthe adsorbate in the... 

By single- or three-stage adsorption with an adsorbent, 95% of an adsorbate A in an aqueous solution of C g needs to be recovered. When the linear adsorption equilibrium is given as... 

Monoclonal antibodies (MoAb) will be separated from the supernatant of a mammalian culture by using DEAE-Sephacel as the adsorbent. The supernatant contains 100 jtg/mL of MoAb. Adsorption follows the Langmuir isotherm with Y max =116 mg of MoAb per mL of adsorbent (settled volume) and K L = 0.5 x 1(T3 mg of MoAb per mL of supernatant (Desai et al, 1987). The amount of supernatant is 1 L. If you use 2 mL of DEAE-Sephacel for a single-stage, what percent of the MoAb will be recovered ... 

The most common method of whole broth adsorption with particulate matrices is by fluidizing the particles. Development of a stable fluidized bed with an increased interstitial volume is the key to the purification of biomass-containing feedstocks in this set-up. Two possible modes of protein adsorption can be realized The feed can be applied in a frontal mode as in packed bed chromatography or the column effluent can be recyled, leading to a situation comparable to a batch adsorption in a stirred tank. Frontal and single stage recirculating modes are illustrated in Fig. 2. 

Fig. 2. Frontal and single stage recirculating fluidized bed adsorption...

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