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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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6.3 Initial Guesses for Flow Rates and Temperatures

A reasonable first guess for Lj and Vj is to assume CMO. CMO was not assumed in Eqs. (6-1) to (6-13). With the CMO assumption, we can use overall mass balances to calculate all Lj and Vj.

To start the calculation we need to assume the split for non-key (NK) components. The obvious first assumption is that all the light non-key (LNK) exits in the distillate so that xLNK,bot = 0 and DxLNK,dist = FzLNK. And all heavy non-keys (HNK) exit in the bottoms, xHNK,dist = 0 and BxHNK,bot = FzHNK. Now we can do external mass balances to find all distillate and bottoms compositions and flow rates. This was illustrated in Chapter 5. Once this is done, we can find L and V in the rectifying section. Since ...

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