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Column Sequencing at Infinite Reflux

FKjURK 2.16 Sequencing of infinite rdlux cdumns fcrthe benzene [B]//7-xylene [X]/toluene [T] system at F = 1 atm using (a) a direct split followed by a binary sq)aration, (b) an indirect split followed by a binary separation, and (c) a mixed split followed by two binary sq)arations. [Pg.38]

Sequencing infinite reflux colunms for azeotropic systems is not as trivial. While methods involving stream splitting and mixing can be appUed, this is not the focus of this book, and is not discussed here. For mtffe information regarding this topic, the reader is referred to Fien and Liu [3]. [Pg.39]

What is evident, however, is that at least two columns are needed to perform a separation of an ideal system of three components even more would be needed for azeotropic systems. This now gives rise to some important questions which a designer should be asking  [Pg.39]

These are topics that will be discussed at length in this book. What can be said at this point, however, is that synthesizing columns at infinite reflux, although insightful, does not offer any practical value. [Pg.39]

The reader should also be aware that infinite reflux columns are the smallest attainable columns in terms of column height however, they do require infinitely large internal flows and hence have operating expenses that are infinitely large to ensure continuous vaporization and condensation. This is the one extreme mode of operation, the other mode being minimum reflux which requires an infinitely high column to be built (and therefore have an initial capital investment that is infinitely large), but the smallest internal flows necessary for a desired separation. This is discussed in more detail in Chapter 4. [Pg.39]


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