Batch fluidized bed

FIGURE 11.9 Fluidization regimes in a batch fluidized bed at low multiples of the minimum fluidization velocity. 

A lot of attempts have been made to describe the time dependence of the attrition rate in batch fluidized bed processes. Gwyn (1969) studied the degradation of catalysts in a small-scale test apparatus and defined the elutriated particles as the only attrition product. He described the increase of the elutriated mass, Wel, with time, t, based on the initial solid bed mass, Wbed 0, by the now widely known Gwyn equation ... 

Batch fluidized bed dryers are made in quite small sizes, of the order of 100 lb/hr of feed as the data of Table 9.14(a) show, and are suitable for pilot plant work. 

Figure 12.17. Fluidized bed and spouted bed granulators, (a) A batch fluidized bed granulator used in the pharmaceutical industry performance data in Table 12.19(a). (b) Part of a fluidized bed incineration process for paper mill waste recovering sodium sulfate pellets performance data in Table 12.19(b). (c) A three-stage fluidized bed granulator for more complete control of process conditions and more nearly uniform size distribution, (d) Two modes of injection of spray to spouted beds, into the body on the left and at the top on the right performance data in Table 12.19(c).

As the ligand-protein interaction takes place at the internal surface of porous adsorbents, kinetics and equilibrium of the interaction should be independent of the interstitial voidage within an adsorbent bed. Therefore the equilibrium capacity of an adsorbent will not be influenced by different experimental configurations e.g. batch stirred tank, batch fluidized bed, frontal application to packed or fluidized beds. The major difference arises from the medium from which the protein is isolated. As fluidized beds are used for whole broth adsorption, the properties of the broth have to be considered regarding the possible influence of components which are removed in conventional primary recovery steps and therefore are not present during the initial chromatography operations in a standard downstream process. These are on one hand nucleic... 

Figure 11.9 Fluidization regimes in batch fluidized bed at low multiples of minimum fluidization velocity (a) packed bed (b) incipient fluidization (c) bubbling fluidization (d) slugging fluidization (c) pneumatic transport.

Fig. 7.79 Batch fluid bed spray granulator system. (1) Air filter and heater, (2) powder batch/fluidized bed, (3) spray nozzle, (4)/(5) liquid feed tank and pump, (6) bag filter, (7) exhaust fan (courtesy CEA/NIRO, Soeborg, Denmark).

Hayakawa, T., W. Graham and G. L. Osberg, A Resistance Probe Method for Determining Local Solid Particle Mixing Rates in A Batch Fluidized Bed, Can. J. of Chem. Eng., June 1961, pp. 99-103. 

Line B Ratios for steam-only batch fluidized-bed gasification of a wide range of cokes and chars (including high temperature coke) at atmospheric pressure. 

Line C Ratios for steam-oxygen batch fluidized-bed gasification of a bituminous char at 8.5 atm. 

A batch fluidized bed crystallizer is frequently used for precise measurements of the crystal growth kinetics (Karpinski 1981). The technique is particularly suitable for systems with the density of crystals exceeding that of the solution by more than 10%, and for seed crystals in the 1 x 10 — I x 10 m size range. Most inorganic salts fall into that category. An example of an experimental... 

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