Saddle packing designs

Saddle packing, 57 Safety, in design, 34 Savannah River plant, 23, 73 Scatchard-Hamer equation, 198 Scheibel column, 82 Schmidt number, 664 Secondary reflux and boilup, 698-704 Selection of separation operations, 32, 534 factors in selection, 34-35 Selectivity, relative, 145 Separation operations, 8-11, 20 Separation process, 1-47 synthesis, 527-547 Separator sequences, 530 Sequence of separators, 527-528 direct, 529 indirect, 529 Shell Chemical Co., 513 Shortcut design methods, 427-493 Shower trays, 77 Side streams, 392 Sieve trays, 68-69... 

Figure 9-28. Packing comparison at design point for IntaJox ceramic saddles, metal pall rings, and metal IntaJox . Reproduced by permission of American Institute of Chemical Engineers, Strigle, R. F., Jr. and Rukovena, F., Chemical Engineering Progress, Mar. (1979) p. 86 all rights reserved.

The only available test data [44] indicate that the plain flat plate (26-45% free area) has a decided detrimental effect on the allowable flooding conditions of the tower whereas the wire screen, weir-type, and fused Raschig ring designs have very little effect when using Intalox saddles for packing. 

Figure 9-44. Gas-liquid hold-up data for ceramic rings and saddles. Used by permission of Leva, M. Tbwer Packings and Packed Tower Design, 2nd ed., U.S. Stoneware Co. (now, Norton Chemical Process Equipment Corp.) (1953).

Absorption column packed column, diameter 0.5 m, height 6.0 m, packing height 4.5 m, packing 25 mm ceramic saddles, design pressure 2 bar, material carbon steel. 

Intalox saddles, Super Intalox and Hypac packings are proprietary design, and registered trade marks of the Norton Chemical Process Products Ltd. 

In many industrial applications of packed columns, it is desirable to know the volumetric hold-up of the liquid phase in the column. This information might be needed, for example, if the liquid were involved in a chemical reaction or if a control system for the column were being designed. For gas-liquid systems the hold-up of liquid Hw for conditions below the loading point has been found(48) to vary approximately as the 0.6 power of the liquid rate, and for rings and saddles this is given approximately by ... 

This is a simple method of representation which has been widely used as a method of design. Despite this fact, there have been few developments in the theory. Murch 71 gives the following relationships for the HETP from an analysis of the results of a number of workers. Columns 50-750 mm diameter and packed over heights of 0.9-3.0 m with rings, saddles, and other packings have been considered. Most of the results were for conditions of total reflux, with a vapour rate of 0.18-2.5 kg/m2s which corresponded to 25-80 per cent of flooding. The relationship is ... 

A column packed with 5-cm polypropylene saddles a = 55 m /m ) is being designed for the removal of chlorine from a gas stream (G = 100 mol/s m, 2.36% CI2) by countercurrent contact with an NaOH solution... 

The amount of liquid holdup in the packing is of interest when the liquid is unstable or when a desirable reaction is to be carried out in the vessel. A correlation for Raschig rings, Berl saddles, and intalox saddles is due to Leva (Tower Packings and Packed Tower Design, U.S. Stoneware Co., Akron, OH, (1953) ... 

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