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

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4.4 Feed Line

In any section of the column between feeds and/or product streams the mass balances are represented by the operating line. In general, the operating line can be derived by drawing a mass balance envelope through an arbitrary stage in the section and around the top or bottom of the column. When material is added or withdrawn from the column the mass balances will change and the operating lines will have different slopes and intercepts. In the previous section the effect of a feed on the operating lines was determined from the feed quality and mass balances around the entire column or from Eq. (4-25). Here we will develop a graphical method for determining the effect of a feed on the operating lines.

Consider the simple single-feed ...

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