Packing, high capacity

The grid types of structured packing have very high capacities and very low efficiencies, and are typically used for heat transfer or for vapor scrubbing. The wire mesh and the crimped sheet types of structured packing typically have lower capacities and higher efficiencies than the grid type. 

Figure 9-6M. Metal VSP high capacity packing. Used by permission of Vereinigte Fulikorper-Fabriken GmBH Co. Ransbach Baumbach, Germany.

Figure 9-6QQ. Nutter Snap-Grid high-capacity grid packing with good structural integrity (interlocking) and reduced fouling. Used by permission of Nutter Engineering, Harsco Corp., Bull. CSG-2.

Figure 9-6RR. Intalox Grid-type packing useful for fouling, solids and heat transfer high-strength, low-pressure drop, high capacity, better efficiency than most structured and random packing. Used by permission of Norton Chemical Process Products Corp., Bull. IG-1.

Revamp the tower internals with high-capacity trays or packing. 

Production of hypochlorite takes place in a two-step absorption unit in which 23% caustic solution is fed counter-currently to the chlorine feed-stream. In the first step -the liquid jet-loop reactor - about 90% of the chlorine is converted to hypochlorite. In step two - a packed column - a very efficient absorption [1-3] is carried out in which the chlorine concentration in the off-gas is reduced to <1 ppm. The operating window of this apparatus with respect to chlorine load is quite large and varies from 100 to 6000 kg h-1 of chlorine. This high capacity is necessary for the consumption of peak loads from the electrolysis plant during short time periods. During start-up or shutdown of one electrolyser the total chlorine peak load can vary from 100 to 300 kg in just a few minutes. 

High liquid rates. Multipass trays effectively lower the liquid load seen by each part of the tray. A similar trick cannot be applied with packings. The capacity of structured packings tends to rapidly fall off at high liquid rates. 

IC column anion guard anion separators in tandem packed with low capacity anion exchange resin anion suppressor packed with high capacity cation exchange resin. Other IC column resins may be used eluent 1.5 mm NaHC03. 

---