Adsorption fluidized bed

The commercialization by Kureha Chemical Co. of Japan of a new, highly attrition-resistant, activated-carbon adsorbent as Beaded Activated Carbon (BAC) allowed development of a process employing fluidized-bed adsorption and moving-bed desorption for removal of volatile organic carbon compounds from air. The process has been marketed as GASTAK in Japan and as PURASIV HR (91) in the United States, and is now marketed as SOLD ACS by Daikin Industries, Ltd. 

Figure 4.19 Continuous feed of substrate and removal of products synthesis of 3-phenylcatechol from 2-phenylphenol applying a fed batch process with fluidized bed adsorption followed recrystallization...

Ambersorb 600 is a carbonaceous adsorbent for removal of low levels of volatile organic compounds (VOCs) from vapor streams. The adsorbents are placed in a fluidized-bed adsorption system that can attain a high flow rate. Ambersorb 600 is a commercially available technology. 

Fluidized Bed Adsorption as a Primary Recovery Step in Protein Purification... 

The present paper deals with fluidized bed adsorption as an integrative recovery operation. The scope of the contribution is first to describe the concept of the method and the different principles of achieving a combination of solid-liquid separation and chromatography. In the following the main system... 

Fig. 1. Implementation of fluidized bed adsorption into a conventional procedure of protein purification...

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

This set of equations is sufficient to characterize a particulate matrix which should be used in fluidized bed adsorption regarding its fluidization behavior. It has to be noted, however, that the correlations have been developed for the fluidization of spherical particles of uniform diameter. In reality, most adsorbents are provided with a certain distribution of particle diameter. In this case, classified fluidization occurs and a modified equation should be used to describe the hydrodynamics of bed expansion [21]. For an estimation of the suitability of a certain matrix for fluidized bed adsorption the correlations shown above are convenient to use and provide sufficient information. The minimum fluidization velocity may be calculated using an average particle diameter as recommended by Couderc [22], In the next section, conventional as well as new matrices shall be described under this respect. 

In principle, the experimental protocol of fluidized bed adsorption does not deviate from packed bed operations, the main difference being the direction of liquid flow. The standard sequence of frontal chromatography, equilibration, sample application, wash, elution, and cleaning (CIP) is performed with an upward direction of flow as shown in Fig. 3. During equilibration of the matrix the stabilization of the fluidized bed occurs, in case of size and/or density distribution of the adsorbent particles the classification within the bed may be detected by visual observation of the bed. As discussed below, bed stability may... 

As in fluidized bed adsorption, proteins are bound to porous particles as well, these parameters will remain important and must be considered when describing protein adsorption to fluidized beds. As mentioned above, fluidizing the adsorbent allows free movement of the particles within the adsorbent bed, so dispersion in the solid phase is another component determining process performance. 

The scope of the following chapter will be an attempt to identify system parameters limiting the efficiency of fluidized bed adsorption and to define operating parameters, e.g. adsorbent design, flow rate, column geometry, and... 

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