Columns static sieve tray

FIG. 15-32 Schematic of common static extractors, (a) Spray coiumn. ib) Packed column, (c) Sieve tray column. 

Pulsed sieve tray columns differ significantly from static sieve tray colunms as they do not have any down comers. The light and the heavy phase pass periodically through the same holes. Furthermore, pulsed tray columns have a much larger relative free area of up to 0.25 with hole diameters of 2-A mm. 

Fig. 6.3-4 Typical performance data of ten different extractor designs for the system tolulene/acetone/water. MS mixer-settler, SE static sieve tray column, PC static packed packed column, RDC rotating disc contactor, PSE pulsed sieve tray column, PPC pulsed packed column, RZE agitated cell extractors...

The Graesser contactor takes an extreme position in the diagram. It has the highest separation efficiency (10 stages per meter) but the lowest capacity (1-2 m/h). The other extremum takes the static sieve tray extractor with only one equilibrium stage per meter and up to 50 m/h capacity. The capacity of a pulsed sieve tray column is as high as 30 m/h with a separation efficiency of 5 to 6 stages per meter. 

Figure 7.1 Conventional equipment used for fluid-fluid reactions (columns (a) multistage agitated column, (b) packed column, (c) sieve tray column, (d) buss loop reactor, (e) tubular reactor, and (f) static mixer)...

Figure 12.16 Illustration of possible types of slurry bubble column reactors, (a) Simple bubble column, (b) cascade bubble column with sieve trays, (c) packed bubble column, (d) multishaft bubble column, and (e) bubble column with static mixers [61].

Static extraction columns Spray column Baffle column Packed column (random and structured packing) Sieve tray column Deliver low to medium mass-transfer efficiency, simple construction (no internal moving parts), low capital cost, low operating and maintenance costs, best suited to systems with low to moderate interfacial tension, can handle high production rates Petrochemical Chemical Food... 

Dynamic simulation of distillation column needs also tray sizing. We considered sieve trays with 0.4 m diameter of and 0.05 m static liquid height. 

The static packed column, shown in Fig. 6.3-1, is more efficient with respect to mass transfer. Its design is similar to that of gas/hquid systems (e.g., absorption and distillation). In contrast, the design of a static tray column, used for solvent extraction, is completely different from the corresponding column for gas/liquid service. The sieve trays have very small hole diameters (2-4 mm) and a very small free area 2-4%) (Fig. 6.3-1). 

The selection criteria listed in Section 13.1 indicate that mixer-setders are a good choice if only a few equilibrium stages are needed however, if, as is often the case, a few more stages are required, then a nonagitated (static) column such as a spray, sieve tray, or packed column should be used. These columns are commonly used for relatively large-scale systems in the chemical and petrochemical industries. 

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