Page 341 - Chemical process engineering design and economics

320 Chapter 6

Table 6.2.1 Continued

Variables

Absorbers

Tray Columns — m L- m Lm- yi k- K k - A A - N E - N A - E 0 - Z - Z T - a - U L - D

Packed Columns — m L - m Lm - y, k - K k - A A - N E - Z - D - HETS

Strippers

Tray Columns — m v - m Lm - x 2k - K k - A A - NE - N A E 0 -Z-Z T -a-|.iL-D
-
- x 2k - K k - A A - N E - HETS
Packed Columns — my - mi. m

TABLE 6.22 Calculation Procedure for Sizing Isothermal Absorbers
or Strippers-Column Height_________________________

1. For absorbers, calculate the minimum liquid flow rate, m Lm,, from Equations
6.21.1 A, 6.21.2A, and 6.21.1 IT. For strippers, calculate the minimum gas flow
rate, m Vm,, from Equations 6.21. IS, 6.21.2S and 6.21.8P.

2. For absorbers, calculate the actual liquid flow rate, m^, from Equation 6.21.3A.
For strippers, calculate the actual gas flow rate, m v, from Equation 6.21.38.

3. Calculate the column diameter, D, for tray columns, from Equation 1.21.6T and
for packed columns from Equation 6.21.6P.
4. Calculate the absorption factor, A A, from Equation 6.21.4.

5. Calculate the number of equilibrium stages, N, from Equation 6.21.5A for ab-
e
sorbers or Equation 6.21.5S for strippers.
6. Calculate the actual number of stages, N, from Equations 6.21.8T and
A
6.21.10T to 6.21.13T.
7. Calculate the tray spacing, Z T, from Equation 6.21.9T

8. Calculate the column height, Z, from Equation 6.21.7T for tray columns. For
packed columns calculate Z from Equations 6.21.7P and 6.21.9P.

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