Rotating-basket reactor

Hydrogenolysis of ethane over a commercial nickel catalyst was studied in a rotating basket reactor containing 40 g of catalyst. 

Equimolal concentrations of A and B are charged to the reactor and the density remains constant. Laboratory tests were made with a rotating basket reactor in which diffusional resistances were effectively eliminated, with the tabulated results. 

In gas-solid catalytic reactions, the question of whether or not all of the catalyst is uniformly involved in the reaction in a rotating basket reactor was addressed by Smith (1970). He showed that when the reactor had no baffles,... 

For gas-liquid-solid systems, studies on gas-liquid and liquid-solid mass transfer in basket reactors have been rather limited. For the rotating basket reactor, gas-liquid mass-transfer coefficient data are needed. Liquid-solid mass transfer has been studied by Teshima and Ohashi (1977), and their data are correlated by... 

Sampling and product analysis are good. They are the same as those for rotating-basket reactors. 

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. 

The rotating-basket reactor (often known as the Carberry reactor) has been widely used for gas-solid as well as gas-liquid-solid reactions (see Fig. 5-6). Its construction is not very difficult, but it is more complex and expensive to build than a batch or fixed-bed reactor. The catalyst baskets can either be attached to the stirrer [Fig. 5-7(6)] or they can, themselves, be used as the stirrer paddles [Fig. 5-7(a)]. Furthermore, a small variety of rotating catalyst baskets are available (see Fig. 5-8). Baskets must, in general, be small in diameter, so that internal mass-transfer effects are minimized. 

Unlike the rotating-basket reactor, the temperature at the catalyst surface in this type of reactor can easily be measured. 

Sampling and product analysis are as good as in the rotating-basket reactor. 

The kinetics measurements of the ethylene hydrogenation have been carried out in an isothermal rotating basket reactor. 

The rate of a heterogeneous reaction was measured in a rotating basket reactor. The volume of the basket was 100 mL and it was filled with 240 g of catalytic particles whose specific surface area was 9.5m /g of... 

Rotating basket reactor Excellent Good Excellent Good Difficult, expensive... 

Carberry reactor The gas flows continuously through the tank-type reactor, whereas the catalyst is placed in rotating baskets in the reactor. This reactor is also experimental and suitable for catalysis as well as for adsorption studies (Figure 3.6). 

The catalyst modified with selenium is most suitable for the studies of reaction kinetics since this element, in contrast to chlorine usually used as promoter in the commercial processes, does not volatilize from the surface of silver under the reaction conditions. We studied the kinetics of ethylene oxidation under gradientless conditions (Section II) using a circulation flow system in the experiments at atmospheric pressure (59-61) and a reactor with rotating baskets for the catalyst (5) at elevated pressures (62). 

Fig. 16. Schematic of a rotating-basket type reactor. (After Chaudhari et al., 1986, by courtesy of Marcel Dekker, Inc.)...

Construction difficulty and cost are close to those for the rotating-basket and other similar continuously stirred tank reactors. 

Figure 5-13 Stationary cylindrical-basket reactors. (u) With a rotating impeller, (fc) with a rotating reactor pot.

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