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Mechanically-agitated extractors

Perforated-plate (sieve-plate) towers B. Mechanically agitated extractors 1. Towers with rotating stirrers 2. Pulsed towers... [Pg.1297]

Sieve-tray towers are very effective, both with respect to liquid-handling capacity and extraction efficiency, particularly for systems of low interfacial tension which do not require mechanical agitation for good dispersion. The general assembly of plates and downspouts is much the same as for gas-liquid contact except that a weir is not required. Towers packed with the same random packing used for gas-liquid contact have also been used for liquid extractors however, mass-transfer rates are poor. It is recommended instead that sieve-tray towers be used for systems of low interfacial tension and mechanically agitated extractors for those of high interfacial tension (Treybal, 1980). [Pg.463]

Extractors with mechanical agitation, such as mixer-settlers, Kuhni columns, York-Schiebel columns, etc., should be avoided as much as possible. Up to seven theoretical stages packed extraction columns can be conveniently adopted. Sieve-plate extractors can be used up to 20 stages. When a very efficient extraction has to be carried out with expensive solutes, and for reasons of material stability and requirements of low expensive product inventory, we may have to use centrifugal extractors or hollow-fibre extractors. [Pg.418]

Fig. 26. Mechanically agitated industrial contactors, (a) mixer-settler (b) rotating-disk column (c) mixco column (d) asymmetric rotating-disk column (e) pulsed packed column (f) Podbielniak centrifugal extractor. (Reprinted from Doraiswamy, L. K and Sharma, M. M., Heterogeneous Reactions Analysis, Examples and Reactor Design, Vols. I and 2, 1984, John Wiley and Sons.)... Fig. 26. Mechanically agitated industrial contactors, (a) mixer-settler (b) rotating-disk column (c) mixco column (d) asymmetric rotating-disk column (e) pulsed packed column (f) Podbielniak centrifugal extractor. (Reprinted from Doraiswamy, L. K and Sharma, M. M., Heterogeneous Reactions Analysis, Examples and Reactor Design, Vols. I and 2, 1984, John Wiley and Sons.)...
I. Gravity-operated extractors A. No mechanical agitation 1. Spray towers 2. Packed towers... [Pg.1297]

Extraction columns can be further sub-divided according to the method used to promote contact between the phases packed, plate, mechanically agitated, or pulsed columns. Various types of proprietary centrifugal extractors are also used. [Pg.617]

A = Unagitated Columns B = Mechanically Agitated Columns C = Mixer - Settlers D = Centrifugal Extractors... [Pg.1747]

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). [Pg.40]

Figure 10-3. Continuous countercurrent extractors - mechanically agitated. (Courtesy - R.E. Kirk and D.F. Othmer, Encyclopedia of Chemical Technology, John Wiley Sons, New York, NY, 1980)... Figure 10-3. Continuous countercurrent extractors - mechanically agitated. (Courtesy - R.E. Kirk and D.F. Othmer, Encyclopedia of Chemical Technology, John Wiley Sons, New York, NY, 1980)...
The following diagrams are hopefully self-explanatory. To improve the efficiency of the extraction, mechanical agitation often is added. Figure 10-3 shows several arrangements of these types of extractors. These are divided into rotary and reciprocating types. [Pg.109]

With mechanically agitated countercurrent extractors, energy is induced by rotating internals. Agitators are usually mounted on a central column shaft at certain distances from each other (double blade mixer, disc mixer, blade mixer, turbine mixer, helical screw mixers, etc.). Installation of stators (ring discs, punched metal sheets. [Pg.440]


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See also in sourсe #XX -- [ Pg.544 , Pg.545 , Pg.546 ]




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Agitation

Agitators

Countercurrent extractors (mechanically-agitated

Extractor

Mechanical Agitators

Mechanical agitation

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