Multistage cascade reactor

Many different bubble column designs have been used over the years, all adapted to particular practical needs [133]. Figure 8.6 depicts a few of the modifications frequently used. A special case is the down-flow bubble column. In the column part of this reactor flow of the two phases is co-current from top to bottom as shown in Fig 8.6. The advantages of this type of reactor is that the relatively short gas residence times obtained in up-flow reactors, can be increased since the residence time is determined by the bubble rise velocity [28]. Furthermore, incorporation of additional perforated plates transforms the simple column, sketched in Fig 8.1, into a multistage cascade version, Fig 8.6. This redistribution of gas over the perforated plates intensifies mass transfer,... 

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