Packed Bed flooding.pdf - Youngstown State University's Personal ...

More documents

Recommendations

Info

LIVE GRAPH Click here to view FIG. 14-58 The Robbins generalized pressure-drop correlation. (From L. A. Robbins. Chem Eng. Progr., May 1991. p. 87, reprinted courtesy of the American Institute of Chemical Engineers.) HETP, in EQUIPMENT FOR DISTILLATION AND GAS ABSORPTION: PACKED COLUMNS 14-65 0.0 0.5 1.0 1.5 2.0 2.5 3.0 100 90 80 70 60 50 40 3.5 inch (88.9 mm) 2 inch (50.8 mm) Harrison and France (loc. cit.) presented the only published rule of thumb for structured packings efficiency as a function of packing crimp. Kister and Larson reexpressed it in terms of the surface area per unit volume to accommodate a wider range of packing geometries. The final expression is F s , m/s (kg/m 3 ) 0.5 30 0.8 5/8 inch (15.9 mm) 20 0.4 10 1 inch (25.4 mm) 0 0.0 0.4 0.8 1.2 1.6 2.0 2.4 0.0 2.8 F s , ft/s (lb/ft 3 ) 0.5 HETP = 100C XY/ap + 0.10 (14-159) Specific surface areas are listed in Tables 14-13 and 14-14. The above rules of thumb apply to organic and hydrocarbon systems, whose surface tensions are relatively low (σ
14-66 EQUIPMENT FOR DISTILLATION, GAS ABSORPTION, PHASE DISPERSION, AND PHASE SEPARATION FIG. 14-60 Effect of structured packing surface areas, loads, and inclination angle on packing efficiency. Efficiency expressed as number of theoretical stages per meter, the reciprocal of HETP. Sulzer data, chlorobenzene–ethylbenzene, 100 mbar, at total reflux; 250-mm-diameter test column. (Reprinted courtesy of Sulzer Chemtech.) these data to the good, yet imperfect, distributors used in the real world. For poor distributors, the above rules of thumb will usually predict well below the HETPs measured in the field. Lockett (Chem. Eng. Progr., p. 60, January 1998) simplified the fundamental Bravo-Fair-Rocha correlation [Ind. Eng. Chem. Res. 35, p. 1660 (1996)] to derive an alternative rule of thumb for structured packing efficiency. This rule of thumb predicts HETPs under perfect distribution conditions. Lockett recommends caution when applying this rule of thumb for aqueous systems as it does not predict the effects of underwetting (below). Service-Oriented Rules of Thumb Strigle (<strong>Packed</strong> Tower Design and Applications, 2d ed., Gulf Publishing, Houston, Tex., 1994) proposed a multitude of rules of thumb as a function of the service, column pressure, and physical properties. These rules are based on the extensive experience of Strigle and the Norton Company (now merged with Koch-Glitsch LP).
Page 1 and 2: Previous Page 14-58 EQUIPMENT FOR D
Page 3 and 4: 14-60 TABLE 14-13 Characteristics o
Page 5 and 6: 14-62 EQUIPMENT FOR DISTILLATION, G
Page 7: 14-64 EQUIPMENT FOR DISTILLATION, G
Page 21 and 22: 14-78 (a) (b) (c) FIG. 14-71 High-v
Page 43 and 44: 14-100 EQUIPMENT FOR DISTILLATION,
Page 59 and 60:
14-116 EQUIPMENT FOR DISTILLATION,
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
show all

Packed Bed flooding.pdf - Youngstown State University's Personal ...

Create successful ePaper yourself

Delete template?

Save as template?