Tray Design Summary

Type of tray Hole diameter, in Tray thickness Number of passes 

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The AIChE Bubble Tray Design Manual (AIChE, 1958 Gerster et al., 1958) presented the first comprehensive estimation procedure for numbers of transfer units. For many years this remained the only such procedure available in the open literature the work of organizations like Fractionation Research Incorporated (FRI) was available only to member companies. However, during the last 15 years or so there has been a revival of distillation research and other comprehensive estimation procedures have been published (e.g., Zuiderweg, 1982 Chan and Fair, 1984a). We summarize these methods below. The text by Lockett (1986) provides an excellent summary of what is available in the open literature on distillation tray design for those interested in further study. 

Part II contains the design of a major item of equipment (in this case study, it is a sieve-tray absorption column (Chapter 9) ), including the mechanical design, fabrication, materials specification, detailed engineering drawing, HAZOP study, control scheme and associated instrumentation. In summary, as complete and professional a design as... 

A value for the Mutphree vapor-phase efficiency Mv is then calculated for the overall iray by adjusting the point efficiency Eoc lo take into account the effects of liquid mixing and entrainment. A summary of the AlChE design proendure for hubhle-cap trays and an example of its application ate given by King.22... 

At intermediate splits and spUts with distributed component calculation, tray by tray calculation should be carried out from the ends of the column. Design calculation of necessary trays number in each section is carried out for the set of values of the summary concentrations of the impurity components at the... 

In summary, it has been demonstrated that packed columns should be the first choice for vacuum distillation operations. Such a service normally involves a column design restricted by the allowable pressure drop for the number of theoretical stages necessary to produce the specified product. Inherently, modern packed columns always provide a lower pressure drop than a trayed column designed to perform the same function. Only when the trayed column diameter is greatly increased can its pressure drop equal that of a packed column in vacuum service. However, such a design usually is uneconomical. 

In SuperPro designer there is no tray option. Changing the percent SOj removal in Example 7.3 to 99% leads to exit SOj concentration as 310 ppm which is within the accepted range. The process flow sheet and stream summary are shown in Figure 7.68. 

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