Shiny bubble column

For maximum utilization of tlie solid phase in a bubble column, it is essential that aU particles be suspended in the reactor (Ramachandran and Chaudhari, 1984). This means that the gas velocity should be sufficiently high to enable suspension of all solids in the hquid. In shiny bubble column reactors, two suspension states exist ... 

This equation has been also proposed for shiny bubble column reactors and has been derived for water-air and glycol-air systems 0.003 < u q < 0.4, 0 < < 0.44 m/s. SI... 

Now, working these equations and following the metliod used for shiny bubble columns (see Section 3.4.6), C s can be eliminated and an overall reaction rate can be written in terms of the gas-phase concentration ... 

Continuous flow of both phases in upflow with recycling of liquid-phase For packed bubble columns and trickle beds, nnder the assumption of complete recycling of the liquid-phase, the solutions ai e the same as in shiny bubble columns and slurry CSTR with batch and reacting liquid-phase (see Section 3.5.1) (Ramachandran and Chaudhari, 1980). In tills operation, V IV is gi eater than unity. Recycling is useful when the per-pass conversion of the liquid phase is very small. 

In the following sections, the solutions of the models as well as vaiious examples will be presented for the case of shiny bubble column reactors. 

In a typical sluixy bubble column operation, the liquid velocity is one order of magnitude lower than tlie one of gas, and in general, is very low. Tliis mode of operation can be approximated by a semibatch operation. Die semibatch operation is frequently used and is the case where the liquid and the catalyst comprise a stationaiy phase (shiny) in tlie reactor. In this case, the material balance, eq. (3.122) is used along with tlie overall rate based on tlie bulk gas-phase concentiation (see Section 3.4.6). In the following, the semibatch operation is presented. 

Tlie following conelation by Yasunishi et al. has been used for shiny bubble bed columns (Yasunishi et ah, 1986 Koide, 1996) ... 

---