Ring-type packing units

Fig. 346 shows various forms of cylindricnl packing units, all of which are based oil the Raschig ring, a. Some non-cylindrical types are illustrated in Fig. 347. Among the latter we must include the wire Heli-Pak [122] and wire-gauze Octa-Pak ...

Raschig Rings Earliest type, usually cheaper per unit cost, but sometimes less efficient than others. Available in widest variety of materials to fit service. Very sound structurally. Usually packed by dumping wet or dry, with larger 4-6-inch sizes sometimes hand stacked. Wall thickness varies between manufacturers, also some dimensions available surface changes with wall thickness. Produce considerable side thrust on tower. Usually has more internal liquid channeling, and directs more liquid to walls of tower. Low efficiency. 

Gasoline and kerosene rerunning was accomplished primarily in horizontal batch shell stills heated by direct firing or internal steam coils and surmounted by a vertical rectification column with partial condensers to supply reflux. The rectifying column in some installations was packed with iron rings, pipe fittings, earthware crocks, tin cans, or any suitable material readily available. In other units a fairly common type of column was the Heckmann bubble cap tower. 

Filter units are broadly classified into two types (1) fabric or cloth bag systems and (2) deep columns packed with rock or other contactors such as fiber plates or glass beads or rings. Commerical fiber materials are selected for... 

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