Packed columns internals

As indicated above, packed column internals include hqiiid distributors, packing support plates, redistributors (as needed), and holddown plates (to prevent movement of packing under flow conditions). Costs of these internals for columns with random packing are given in Fig. 14-80, based on early 1976 prices, and a Marshall and Swift cost index of 460. 

Typical packed column internals are shown in Figures 2-11. 

Figure 1. Packed column internals. (Reprinted by special permission from Chemical Engineering, March 5, 1984, copyright 1984 by McGraw-Hill, Inc.)...

Figure 8.7 provides fractionation column internal trays that are to be added to the overall pressure vessel cost. A packed-column internal (random packing) cost is also given as cost per cubic foot of column-packed volume. 

The most important aspects of packed-column internals and their design are outlined in the following paragraphs. 

The packed column internal flows are estimated in a similar manner as the trayed column, based on a reflux ratio of 1.95 ... 

Barbiturates, packed column, internal standardisation, silanising. 

When a sparger pipe enters an intermediate feed, vapor jets must not impinge on redistributor liquid surface or other packed-column internals. Liquid surface agitation in redistributors, or mechanical damage to internals, can cause maldistribution, which can be detrimental to column efficiency. 

TABLE 20.8 Troublesome Packed Column Internals Continued)... 

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