By Ernest J. Henley

ISBN-10: 0471371084

ISBN-13: 9780471371083

Makes use of a lot of industrially-significant difficulties to show an in-depth knowing of contemporary calculation techniques. contains a number of topical examples and difficulties, and either traditional and SI devices.

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Sample text

A woven wire-mesh packing, which was arranged in rows of vertically corrugated elements, was developed in the 1960s in Switzerland [3]. Billet et al. ) in 1969 [4]. These investigators found that the HETP value of the packing increased with increasing vapor loading. 07 in. H 2 0 per theoretical stage when operated at 50% of its maximum capacity. In 1985 Bravo et al. described the mass transfer characteristics of this packing [5]. Subsequently, other wire-mesh structured packings, such as Intalox Wire Gauze packing (trademark Norton Chemical Process Products) have been developed.

Pressure drop per theoretical stage for Intalox Structured packings is only 40% to 65% of that for IMTP packings of similar capacity. These features make structured packing especially suited for use in vacuum distillation services where column size is controlled to a large degree by the pressure drop per theoretical stage. Since that time, such structured packings have found increasing application in vacuum services at pressures as low as 5mm Hg absolute. However, structured packings also are used in atmospheric and high-pressure distillation services when their capacity/efficiency characteristics are superior to random packings.

This absorption of energy by the liquid phase represents an increasing percentage of the pressure drop as the liquid flow becomes greater. 1'12 in. Intalox8Saddles (Ceramic). Column Diam. = 16 in. 2 11. I 1 1 Air Mass Velocity, G (Iblft* h) Figure 1-18. Pressure drop vs. gas rate-soncurrent flow (1 %-in. lntaloxB saddles-ceramic). 26 Packed Tower Design and Applications I I I I 1 1 I I I 2 in. Pall Rings (Plastic). Column Diam. = 16 in. 6 ft. Air Mass Velocity, G (lbIft2 h) Figure 1-19. Pressure drop vs.

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Equilibrium-Stage Separation Operations in Chemical Engineering by Ernest J. Henley

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