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

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4.9.4 Intermediate Reboilers and Intermediate Condensers

Another modification that is used occasionally is to have an intermediate reboiler or an intermediate condenser. The intermediate reboiler removes a liquid side stream from the column, vaporizes it, and reinjects the vapor into the column. An intermediate condenser removes a vapor side stream, condenses it, and reinjects it into the column. Figure 4-23A illustrates an intermediate reboiler.

Figure 4-23. Intermediate reboiler; (A) balance envelopes, (B) McCabe-Thiele diagram

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An energy balance around the column will show that QR without an intermediate reboiler is equal to QR + QI with the ...

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