Dynamic mixers/reactors

Controlled Deformation Static or Dynamic MIxers/Reactors... 

High-intensity inline devices are often used to mix fluids in the process industries. Such devices include simple pipes, baffled pipes, tees, motionless mixers, dynamic mixers, centrifugal pumps, ejectors, and rotor/stator mixers. In addition to their traditional application in physical processes such as mixing and dispersion, such devices can provide very effective environments for mass transfer and chemical reaction to take place. Furthermore, combining effective inline mixing with heat transfer is the basis of combined heat exchanger reactors (HEX reactors). 

The effect of PP and PE ratios has been studied earlier (45 7) when itaconic acid (lA) was grafted to their blends containing L-101 peroxide as the initiator. Grafting was done in the extruder reactor assembled on the base of Brabender plastograph (Duisburg, Germany) equipped with the dynamic mixer (48,49). 

The results reported in this paper are characteristic not only of grafting of lA onto PP/PE blends carried out in the Brabender plastograph equipped with a dynamic mixer, but also of lA grafting performed in reactors of other types, particularly in a single-screw extruder. 

D microfabricated micro mixers (see Section 4.1.5) may be connected to tubes for reasons of residence time prolongation, similar to chip-tube micro reactors (see Section 4.1.4). The tube may also have the function of creating distinct hydro-dynamic features (see Section 4.1.4). 

Computational fluid dynamics (CFD) is an effective tool in analyzing the velocity distribution and other pertinent parameters in a static mixer. CFD is also being recognized as an effective tool in enhancing the performance of mixers and reactors, which is reviewed in Chapter 10. 

First of all, the plant flowsheet is split into units / group of units. The splitting it is done in units to which local control is applied the reactor (plus the heat exehangers around it), the distillation columns, mixing vessels, pumps. Since the mixers and the pumps are considered instantaneous (no dynamics) they are not interesting for the model reduction. Further, the units are individually reduced. 

Non-gradient internal circulation reactor achieves high-speed circulation by the impeller of stirrer to promote gas flow in the reactor to obtain an ideal mixing in the reactor and to avoid the gradients of temperature and the concentration. Mixers are generally driven by magnetic to make dynamic seal become static seal, which is now more applicable. The performance of above main reactor is shown in Table 7.3. 

---