Page 342 - Applied Process Design For Chemical And Petrochemical Plants Volume II

Packed Towers 331

5. Read pressure drop coefficient, F The performance and design information in Glitsch ref-
Read, F, for the approximate calculated Cs, ft/sec erence [104], as for all the other manufacturers with
from Table 9-37 at calculated liquid rate, lb/hr-ft2. respect to their data and charts, is proprietary, but not
Then read Y from IMTP Packing Pressure Drop necessarily warranted to be suitable for the designer's ser-
chart, Figure 9-21G and then read curves showing vice/applications unless verified by the manufacturer's
pressure drop, (may require interpolation). representatives.
6. Typical HETP data are shown in Figure 9-56A-C.

Gempack@ Structured Packing; Glitsch, Inc. Example 9-8: Heavy Gas-Oil Fractionation of a Crude
Tower Using Glitsch's Gempak@' (used by permission of
These packings are represented in part by Glitsch, Inc.'s Glitsch, Inc. Bulletin 5140)
bulletin [lo41 (Figure 9-6KK) and they cite the perfor-
mance of the packing as: The heavy naphtha-light gas oil fractionation zone of a
crude tower has to be revamped to handle 25% more
1. High efficiency: 5-25 in. HETP ('7.9-1.6 theoretical capacity. Because trays would be working at high percent
plates per meter.) flooding, Gempak structured packing is condensed (Fig-
2. Low pressure drop: 0.5-0.7 mm Hg/theoretical plate ures 9-56A-D) .
3. High vapor loadings: up to 0.5 C-Factor (up to 4.0 F- The loads are as follows:
Factor)
4. High liquid capacity: 0.5-53 U.S. gpm/ft2 (1.22-134 Vapor rate: 688,000 lb/hr, density: 0.355 lb/ft3 (p,)
m3/m2/hr) Liquid rate: 381,000 lb/hr
5. Wide turndown ratio: limited only by distributors specific gravity hot: 0.68 (42.42 lb/ft3) (PI)
6. Availability: diameters from 4 in. to over 45 ft (10 cm viscosity: 0.281 cp
to 13.7 meters) Non-Foaming System
7. Series available: Tower diameter: 15 ft-0 in.
(176.713 ft* cross sectional area)
(a) Series AT General purpose, suitable for low wet- Height available for packed bed: 6.5' (78 in.)
ting rates and high vacuum applications. (excluding height for distributor)
(b) Series AS: General purpose, suitable for high wet-
ting and heat transfer applications. 1. Calculate the vapor load:
(c) Series AW Latest generation of Gempack@, better
efficiency with same hydraulic capacity as other Vapor, cfs (688,000/(3,600) (.355) = 338.3
series listed. Vapor velocity = V, = (538.2)/(176.715) = 3.046 ft/sec
(d) Series AL: Especially suited for low wetting rates Gfactor =V, [(p,)/(pl- p~)]'/~ =
and chemical applications. 3.046 [(.355)/(42.42 - .355)]'12 = 0.28
(e) Series BG Wire gauze packing, crimped to 60"
from horizontal, for high efficiency applications
and very low wetting rates in clean service. (text continued on page 335)

Table 9-37
Norton Intalox@' Structured Packing Pressure Drop Coefficient F* for Type 2T Packing
..... . ....... ...... ........ ... . ...
Liquid, Kg/h 0 m2 9,760 24,400 48,800 73,200 97,600 122,000
2 Liquid, Ib/h ftz 2,000 5,000 ...... 10,000 15,000 20,000 25,000
2 . .... ..... Intalox Structured Packing 2T - ... .- -~ .
~-
.-
z -. . . ...... .............. ... .~ .... . .-
0 F when C, in m/s 205 215 250 300 325 365
F when C, in ft/s 19 20 23 28 30 34
~ . .... ........ -_ ........ .. . .~
These packing factors can be used to predict the pressure drop of Intalox Structured Packing 2T when used with the Generalized Pressure Drop
Correlation as illustrated in Norton's Intalox High-Performance Separation Systems; Figure 9-21G this text.
Used by permission of Norton Chemical Process Products Corp., Bull. ISI-R.