By Ralph F., Jr. Strigle
Over the past 25 years, major adjustments have taken position in either the layout of tower packings and the applying of packed columns. more and more, issues have became from potential to power potency and the environmental influence of processing operations. This new version has been retitled and up-to-date all through to mirror those alterations and the increased makes use of for based programs. It presents uncomplicated details at the operation mechanism of packed columns, in addition to sensible tools for designing such columns, confirmed tools which have been used over the past decade to layout columns as huge as forty six ft in diameter and for separations requiring as many as 128 theoretical phases. The systems offered are in keeping with the author's useful adventure obtained over forty years, and feature in lots of circumstances been constructed due to real-life alterations. the varied and sundry significant purposes of packed columns are reviewed, in order that their merits in comparison to different mass move units will be made up our minds. specific features of a procedure that must be thought of to make sure profitable column operation are mentioned.
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Extra resources for Packed Tower Design and Applications
A woven wire-mesh packing, which was arranged in rows of vertically corrugated elements, was developed in the 1960s in Switzerland . Billet et al. ) in 1969 . 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 . 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.
Packed Tower Design and Applications by Ralph F., Jr. Strigle