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A fluidized bed reactor (FBR) is a type of reactor device that can be used to carry out a variety of multiphase chemical reactions. In this type of reactor, a fluid (gas or liquid) is passed through a solid granular material (usually a catalyst) at high enough speeds to suspend the solid and cause it to behave as though it were a fluid.
The process involves copper-catalyzed reactions of alkyl halides with elemental silicon, which take place in a fluidized bed reactor. Although theoretically possible with any alkyl halide, the best results in terms of selectivity and yield occur with chloromethane (CH 3 Cl). Typical conditions are 300 °C and 2–5 bar. These conditions allow ...
Circulating fluidized bed combustion [16] Coal gasifiers [7] [17] Cyclones [18] Fluid catalytic cracking reactors and regenerators; Fluidized bed dryers [19] [20] Fluidized bed reactors [21] Liquid-solid settlers [5] Metal casting [13] [22] [23] Particle jets [24] Polysilicon deposition [25] Spray coating [8]
The fluidized catalyst particles are shuttled between the fluidized bed reactor and a fluidized bed burner where the coke deposits are burned off, generating heat for the endothermic cracking reaction. By the 1950s, fluidized bed technology was being applied to mineral and metallurgical processes such as drying, calcining, and sulfide roasting.
The current industrial method places finely ground silicon in a fluidized bed reactor at about 300 °C. The catalyst is applied as Cu 2 O . Methyl chloride is then passed through the reactor to produce mainly dimethyldichlorosilane.
Oldest power station utilizing circular fluidized bed technology, in Lünen, Germany. A fluidized bed is a physical phenomenon that occurs when a solid particulate substance (usually present in a holding vessel) is under the right conditions so that it behaves like a fluid. The usual way to achieve a fluidized bed is to pump pressurized fluid ...
Ebullated bed reactors are a type of fluidized bed reactor that utilizes ebullition, or bubbling, to achieve appropriate distribution of reactants and catalysts.The ebullated-bed technology utilizes a three-phase reactor (liquid, vapor, and catalyst), and is most applicable for exothermic reactions and for feedstocks which are difficult to process in fixed-bed or plug flow reactors due to high ...
Schematic diagram of the traditional Siemens and the fluidized bed reactor purification process. The Siemens process is the most commonly used method of polysilicon production, especially for electronics, [12] with close to 75% of the world's production using this process as of 2005. [13]