Spinning-basket principle

Fig. 3.1.3-2 Types of difFerential circulating reactors with catalyst beds [Buzzi-Ferraris 1999, Perego 1999, Forni 1997] for determining the kinetics of heterogeneously catalyzed reactions, a) Spinning-basket principle a rotating basket containing catalyst pellets acts as a stirrer, b) Jet principle with internal recirculation [Luft 1973b, Luft 1978, Dreyer 1982]. c) External recirculation.

Modified types of rotating basket reactors of similar basic principles have been developed [51,52], The spinning basket reactor apparently can be a good mixer under nonreaction conditions but its effectiveness in reducing interface temperature and concentration differences under reaction conditions is doubted. In this reactor, the true gas velocity relative to the pellets is unknown, because the gas tends to spin along with the basket. Therefore, despite the baffles, an increased speed of rotation does not necessarily reduce the interface temperature and concentration differences to any great extent. This is especially true for smaller catalyst particles and fast reactions. 

Centrifuges (Fig. 3.7), sometimes called hydro-extractors or spinners , are another very common form of filter. They consist of a basket or cage, mounted horizontally or vertically, with holes in the side, which is rotated at a speed such that the centrifugal force throws the contents outwards. In a domestic spin drier the holes are large enough to allow the water to pass but not the clothes. The same principle is applied with a slurry but a filter cloth is fitted inside the basket to retain the solids in the suspension. It is usual to fit a coarse-wire gauze behind the cloth to increase the area available for the liquid to be thrown out. 

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See also in sourсe #XX -- [ ]

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