The Corresponding Composition Scales

A particularly useful concept in synthesizing MENs is the notion of corresponding composition scales. It is a tool for incorporating thennodynamic constraints 

CHAPTER THREE Synthesis of mass-exchange networks 

It is important to derive the mathematical expression relating y, and xy on the practical-feasibility line. For a given y,, the values of xj can be obtained by evaluating x that is in equilibrium with y, then subtracting Cy. i.e., 

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Now that a procedure for establishing the corresponding composition scales for the rich lean pairs of stream has been outlined, it is possible to develop the CID. The CID is ccHistructed in a manner similar to that described in Chapter Five. However, it should be noted that the conversion among the corresponding composition scales may be more laborious due to the nonlinearity of equilibrium relations. Furthermore, a lean scale, xj, represents all forms (physically dissolved and chemically combined) of the pollutant. First, a composition scale, y, for component A in... 

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