Rotating reactors, liquid phase

Finally, the rotating-disk reactor provides efficient gas-liquid mass transfer by constant renewal of the gas-liquid film on the rotating disk. The mass-transfer coefficient in such a reactor can be calculated using Eq. (6.49). The reactor provides a low pressure drop and partially backmixed gas and liquid phases. The extent of backmixing can be further reduced by the use of baffles. Once again, power consumption and mechanical difficulties may limit the size of such vessels. 

Dionysiou DD, Suidan MT, Baudin I, Lane J-M (2002) Oxidation of Organic Contaminants in a Rotating Disk Photocatalytic Reactor Reaction Kinetics in the Liquid Phase and the Role of Mass Transfer Based on the Dimensionless Damkohler Number, Appl. Catal. B Environ. 38, No. 1 1-16. 

Figure 4. Schematic of a rotatable metal atom reactor for dual electron beam vaporization and cocondensation or liquid phase reaction.

Liquid Phase Methods Static and Rotating Reactors (3-7,10,12)... 

Figure 8. Rotatable metal atom reactor for conducting liquid phase metal atom induced polymerizations of organic monomers.

For liquid phase reactions, usually use continuous stirred tank reactors, CSTR, unless the pressure is so high that the rotating shaft of the agitator cannot be sealed. For such high pressures consider the use of static mixers. Most liquid phase reactions are exothermic. 

Figure 1 is a sketch of the cyclone reactor. The liquid is fed tangentially into it (A). A gas mixture of SO3 and N2 is introduced into the reactor via a porous section of the cylindrical wall. The liquid phase is the continuous phase in the reactor, except near the cyclone-axis. Here, a gaseous core is found, due to a strong centripetal field, generated by the rotating liquid. This field causes gas bubbles to spiral from the wall to the cyclone-axis. Gas leaves the reactor via the upper outlet which is known as the vortex. Liquid leaves the reactor via the bottom outlet which... 

Figure 17.11. Types of contactors for reacting gases with liquids many of these also are suitable for reacting immiscible liquids. Tanks (a) with a gas entraining impeller (b) with baffled impellers (c) with a draft tube (d) with gas input through a rotating hollow shaft, (e) Venturi mixer for rapid reactions, (f) Self-priming turbine pump as a mixer-reactor, (g) Multispray chamber. Towers (h) parallel flow falling film (i) spray tower with gas as continuous phase (j) parallel flow packed tower (k) counter flow tray tower. (1) A doublepipe heat exchanger used as a tubular reactor.

Figure 1. Slurry reactors classified by the contacting pattern and mechanical devices (a) slurry (bubble) column (b) countercurrent column (c) co-current upflow (d) co-current downflow (e) stirred vessel (C) draft tube reactor (g) tray column (h) rotating disc or multi-agitated column reactor (i) three-phase spray column — liquid flow —> gas flow.

Here, P0 is the impeller power, s0 is the impeller speed, d, is the impeller diameter, Pl and v l are the density and kinematic viscosity of the liquids, respectively. The term tf Myr adjusts the actual impeller speed to the speed at which a fan-disk turbine would rotate for the same power input per unit mass. Although no gas was used in this study, the correlation should be useful as a first estimate for Ks in various types of stirred three-phase slurry reactors. 

---