When only one stream is withdrawn from a unit such as a mixer, there exists no question about the product distribution for the given unit. For any choice of inputs to the mixer, the corresponding output is uniquely determined by the component-material balance for the mixer (FXi = ditl —ri 3di 3). Thus, for a mixer with a single output, a 0 does not exist. Furthermore, 03 for the proportional divider is unity. Thus, r, 3 may be set equal to 3/dit 3)ca, and the unknown 02 found by use of the following g function

where the value of (dit 2)co is found by solving Eq. (3-31).

Figure 3-13 A system containing a mixer, a distillation column, and a proportional divider.

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