Granulators spouted bed

Chisso-Asahi uses a spouted bed process for the production of their coated materials (12). A 12,000 t/yr faciHty is located in Japan. The semicontinuous process consists of two batch fluid-bed coaters. A dilute polymer solution is prepared by dissolving 5% polymer and release controlling agent into a chlorinated hydrocarbon solvent such as trichloroethylene. The solution is metered into the spouted bed where it is appHed to the fertilizer core. Hot air, used to fluidize the granules, evaporates the solvent which is recovered and reintroduced into the process. Mineral talc, when used, is either slurried into the polymer solution or introduced into the fluidizing air. 

Liquid and solids Size enlargement High shear mixer granulator, fluidized granulator (bubbling bed, spouted bed)... 

Granulation and drying of solutions in a spouted bed were first demonstrated by Berquin (1961). Particle motion which is regular and ordered... 

Robinson, T. and Waldie, B., Dependency of growth on granule size in a spouted bed granulator, Trans. Inst. Ghent. Engrs., 57 (1979) 121-127. 

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).

Spray onto dispersed powder (cf. powder clustering, agitation methods above) Atomized liquid feed is sprayed into circulating dispersion of already-dried particles. Hot gases maintain dispersion. Spray granulation, spouted and fluidized bed granulation Fluidized and spouted beds, Wurster apparatus... 

Spouted bed granulation data for some agricultural chemicals [26]. Performance data reported by Berquin [27]. 

The comments made in Section 3 on the design of fluid bed granulators apply equally to spouted bed systems. Information specific to the theoretical design and analysis of spouted beds is available in ref. [26]. Performance data for the spouted bed granulation of some agricultural chemicals are given in Table 7.5. 

Fluid bed spray granulation ceramic pressbodies, 155, 156 comparison with spouted bed process, 158... 

Spherical agglomeration, see Agglomeration by immiscible liquid wetting Spouted bed granulation... 

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