Rotated disc reactor

Roult s law is known to fail for vapour-liquid equilibrium calculations in polymeric systems. The Flory-Huggins relationship is generally used for this purpose (for details, see mass-transfer models in Section 3.2.1). The polymer-solvent interaction parameter, xo of the Flory-Huggins equation is not known accurately for PET. Cheong and Choi used a value of 1.3 for the system PET/EG for modelling a rotating-disc reactor [113], For other polymer solvent systems, yj was found to be in the range between 0.3 and 0.5 [96],... 

A simple APCVD process for deposition of Ti02 thin films by the gas phase hydrolysis of TiCU yields films at 130-150°C [132]. Nitrogen was used as the carrier gas in a rotating disc reactor. The film quality was sufficient for use as an anti-reflective coating in silicon solar cells, however, no application as a dielectric was reported. 

D. ELENKOV and S.O. VLAEV A Rotating Disc Reactor for Reaction Processes in Slurries... 

A ROTATING DISC REACTOR FOR REACTION PROCESSES IN SLURRIES... 

Three phase slurry reactors are characterized by a gas-liquid (K,a) and liquid-solid (k ) mass transfer coefficient. These coefficients were determined for the rotating disc reactor at the appropriate operation conditions ... 

The performance characteristics of a modified rotating disc reactor has been studied in view of its eventual application for slurry reaction processes in practice It has been found that the backmixing characteristic is favorable 6a8 hold-up and mass transfer coefficients approach values known as characteristic for agitated bubble contactors ... 

D.W., and Thompson, J.M. (2005) Use of a rotating disc reactor to investigate the heterogeneously catalysed oxidation of cinnamyl alcohol in toluene and ionic liquids. J. Catal., 232, 355-365. 

More complex reactor systems for biofilm growth under defined conditions, i.e. controlled hydrodynamic conditions with the possibility of subsequent biocide treatment, include the RotoTorque (rotating annular reactor) (Characklis, 1990), Robbins Device (McCoy et al., 1981), constant-depth film fermenters (Atkinson and Fowler, 1974 Peters and Wimpenny, 1988, 1989) or the radial flow (Fowler and McKay, 1980) and rotating disc reactors (Loeb et al., 1984). An introduction to these reactor systems is given by Gilbert and Allison (1993). 

Rotating Disc Reactor from Montana State University ... 

In the fixed-film reactor, the organisms grow on an inert surface that is maintained in the reactor. The inert surface can be gramJar material, proprietary plastic packing, rotating discs, wood slats, mass-transfer packing, or even a sponge-type material. The reacior can be flooded or have a mixed gas-hquid space (Fig. 25-52). The biomass level on the... 

Anaerobic reactor types 1, up-flow anaerobic sludge bed 2, anaerobic fluidized bed 3, anaerobic filter 4, anaerobic rotating disc 5, inclined tubular digester (6, pre-acidification tank)... 

The use of a rotating reactor to provide efficient mixing has been proposed and tested for viscous polymerizations and acid-catalysed rearrangement reactions [6], The principle of these spinning disc reactors is that the centrifugal force... 

Figure 20.20. Process time saving for the polymerisation styrene in a spinning disc reactor with a disc of 1.08 m in diameter rotating at 6.7 Hz (400 rpm/28)...

Selivanovskaya, S.Y. Petrov, A.M. Egorova, K.V. Naumova, R.P. Protozoa and metazoa communities treating a simulated petrochemical industry wastewater in rotating disc biological reactor. World J. Microb. Biot. 1997, 18, 197 -204. 

Industrial hazardous wastewater can be treated aerobically in suspended biomass stirred-tank bioreactors, plug-flow bioreactors, rotating-disc contactors, packed-bed fixed-biofilm reactors (or biofilters), fluidized bed reactors, diffused aeration tanks, airlift bioreactors, jet bioreactors, membrane bioreactors, and upflow bed reactors [28,30]. 

Two other techniques use attached microorganisms for remediation. In a fluidized-bed method, the microorganisms are attached to particles dispersed throughout a continuously stirred reactor. In another arrangement, the microorganisms are attached to rotating discs. 

Torriero et al. [30] managed to estimate the concentration of lactate in untreated milk without the use of a microdialysis unit. Samples were fed into a reactor consisting of a rotating disc bearing lactate oxidase which by its motion ensured adequate mass transport of hydrogen peroxide to an enzyme electrode. The electrode consisted of horse-radish peroxidase immobilised over osmium on the surface of a glassy carbon electrode. Such an electrode can be poised at 0.0 Y so avoiding electrochemical... 

Figure 16.15 Examples of the rotating-disc membrane reactor design.

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.

In order to improve the heat transfer in a reactor, use can be made of gravitational forces. This concept is used in the spinning disc reactor (SDR) as developed at Newcastle University. The reaction mixture flows in a thin layer in axial direction over a rotating disc. A typical heat transfer coefficient is 10 kW/m2K. This reactor however is dedicated for liquid-liquid reactions. Especially condensation reactions can be enhanced by removing the gaseous by-products thus shifting the chemical equilibrium to the right. 

A recent variant of the rotating disc OMVPE reactor utilizes a water-cooled closespaced reactant injector. This technology shown in Figure 4-17, was principally developed by Rome Air Force Laboratory (U.S. patent 5 129360). In a conventional RDR OMVPE reactor, the injector through which the gaseous reactants flow is placed = 75-150 mm from the hot (600-700 °C) semiconducting substrate to insure that the... 

---