Sutro weir divider

Sutro weir dividers. A device often used for separating gravity reflux and distillate in continuous distillation systems is a Sutro weir divider. There are several variations, two of which (68) are shown in Fig. 19.4. It is suitable for small-scale systems and can eliminate the need for flow metering. Unlike the reflux splitter (below), it decouples... 

A reflux splitter is difficult to incorporate in continuous distillation MB control schemes because it couples variations of the material balance stream (i.e., the distillate) with reflux rate changes. This is especially troublesome when reflux ratio is high, and a rise in distillate rate will effect a severalfold increase in reflux rate. The author experienced one case of poor continuous distillation control which was attributed to the above shortcoming. The author recommends restricting application of reflux splitters to batch distillation, where they work well. In continuous distillation, Sutro weir dividers are far more suitable. 

Figure 19.4 Common examples of Sutro weir reflux dividers. (Concept based on P. S. Buckley, W. L. Luyben, and J. P. Shunta, Design of Distillation Column Control Systems, Instrument Society of America, 1985.)...

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See also in sourсe #XX -- [ ]

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