Oldshue-Rushton column

The Oldshue-Rushton column (Eig. 15d) was developed (162) in the early 1950s and has been widely used in the chemical industry. It consists essentially of a number of compartments separated by horizontal stator-ring baffles, each fitted with vertical baffles and a turbine-type impeller mounted on a central shaft. Columns up to 2.74 m in diameter have been reported in service (162—167). Scale-up is reported to be reliably predictable (168) although only limited performance data are available (169). A detailed description and review of design criteria are available (170). 

A wide variety of extraction column forms are used in solvent extraction applications and many of these, such as rotary-disc contactors (RDC), Oldshue-Rushton columns, and sieve-plate column extractors, have rather distinct compartments and a geometry, which lends itself to an analysis of column performance in terms of a stagewise model. As the compositions of the phases do not come to equilibrium at any stage, however, the behaviour of the column is therefore basically differential in nature. 

Old high bloomery furnace, 74 491 Old magazine paper (OMP), 73 128 Old newspaper (ONP), 73 128 pulp from, 73 95-96 Oldshue-Rushton column, 70 778 Oleandomycin, 75 279, 305 derivatives of, 75 282-285t ester derivatives of, 75 281 registered for use in aquaculture in Japan, 3 221t... 

Mechanical agitation Group E Rotating disc contactor Oldshue-Rushton column Zeihl column Graesser contractor Group F Scheibel column Mixer-settlers... 

Mixer-settlers Scheibel columns Oldshue-Rushton column Rotating disk contractor (ROC) Asymmetric lotating disk extractor (ARC)... 

FIGURE 27 Typical countercurrent liquid-liquid extraction column with mixing phases Oldshue/Rushton column illustrated. 

Countercurrent columns with additional kinetic energy input have found a broad range of industrial applications [42-48]. Examples of extraction towers with energy input are pulsed towers, pulsed packed columns and pulsed perforated-plate towers. A number of units with some form of mechanical agitation are also used (Karr column, Scheibel column, Oldshue-Rushton column, Ktihni column, RZE extractor, RDC and ARD extractor, Graesser contactor). 

Mechanical rotation Mixer-Settler RDC Oldshue-Rushton Column ARD Column Ktkhni Column Raining Bucket Contactor... 

Oldshue-Rushton Column. This column is similar to the RDC, except that the flat rotor discs have been replaced with turbine type agitators (Fig. 20). As with the RDC, the diameter of the agitators can be varied along the shaft to compensate for the progressive change in the physical properties of the system as extraction occurs. 

Unlike the RDC and Oldshue-Rushton columns where the specific throughput of the scaled-up version is the same as the pilot column, it is the characteristic of the Scheibel column that the throughput of the scaled-up column is on the order of 3-5 times greater than that acheived on the pilot column. The reason for this is that the restricted geometry of the 0.075 m diameter column limits throughput these restrictions are removed in the scaled-up columns. 

Extraction apparatus with continuous phase contact Spray column Packed column Pulsed packed column Rotating disc contactor, Oldshue-Rushton column, Graesser-Contactor, Kuhni column Podbiehiiak- Extractor, Luigi-Westfalia- Extractor, De Laval-Extractor... 

The Oldshue-Rushton Column is [6.62] similar to the RDC. Instead of a disc rotor a turbine mixer is used. 

Oldshue-Rushton column A type of column used for liquid-liquid extraction that has fitted agitators, horizontal rings with a central opening, and vertical baffles attached... 

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