As indicated in Chapter 1, exact composition control of product streams requires as many streams as components, and as many manipulated variables as components. Let us consider how to provide composition control of the system in Figure 7.1.
Here top- and bottom-product flows (or their ratios to feed) are available for composition control, but the side draw is needed for column materialbalance control. For this column, however, composition of the sidestream is of primary importance. Let us assume that the feed consists of lumped low
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