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

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G. Computer-Simulation Problems

G1. Aspen Plus is not programmed to use a mass transfer approach (HTU-NTU) for binary packed bed distillation. However, it is easy to obtain accurate values of (y*-y) and m for distillation of binary mixtures from Aspen Plus. Then, Eq. (16-19) can be integrated without assuming that HOG = V/(KyaAc) is constant. If we assume that HL and HG in Eq. (16-27a) are constant in each section of the column and we expand Eq. (16-19) before integrating, we obtain after integration the height of the section,

Image

(16-21a)

The integrals can be determined numerically external to Aspen Plus once the appropriate values have been determined. ...

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