Page 345 - Chemical process engineering design and economics

324 Chapter 6

Table 6.23 Continued

Tray Columns for D > 2.5 ft
rm 'M ' rpv'V- 5 i
L
L
k=f I ———— —— I, Z T I — Figure 6.18 (6.23.4)
L m v' M v' ^ PL' ) J
02
k v = 0.9k(a/20) ,d (dyne/cm) — for non-foaming liquids (6.23.5)
or k = 0.75 k (a/20)02, CT (dyne/cm) — for foaming liquids
v
Z T = f(D) —Table 6.25 (6.23.6)
Packed Columns for D < 2.5 ft

[ m L'M L' ( pv' "l 05 1 (6.23.7)
k = f —————I —— I, d, packing type'I — Figure 6.19, Table 6.26
L my' M v' I PL' J J
02
k v = 0.7k (a/20) , a (dyne/cm) — for non-foaming liquids (6.23.8)
02
ork v = 0.4k (cr/20) , a (dyne/cm) — for foaming liquids
D = 1 5 d (6.23.9)

Variables
Tray Columns

A - D - Z T -v s v v - k - k v

Packed Columns
A - D - d - v v - k - k v

Table 6.24 Calculation Procedure for Sizing Absorbers, Strippers, and
Fractionators - Column Diameter______________________

1. Calculate a preliminary column diameter from Equations 6.23.1 and 6.23.2 by
assuming a superficial velocity of 2 ft/s. If D < 2.5 ft, select a packed column.
Otherwise, select a tray column.

2. Calculate the actual diameter from Equations 6.23.1 to 6.23.6 for tray fraction-
ators or Equations 6.23.1 to 6.23.3 and Equations 6.23.7 to 6.23.9 for packed col-
umns.

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