13.5 Concentrated Immiscible Extraction

If the extraction system is relatively concentrated but still immiscible (this is almost a contradiction), we can extend the ratio unit mass balances developed in Chapter 12 for a single solute to extraction. Assumption 5, Eq. (13-2), no longer needs to be valid. This ratio-unit analysis is easily extended to cross-flow systems.

When the diluent and solvent are immiscible, weight ratio units are related to weight fractions as

Image

(13-22)

where X is kg solute/kg diluent and Y is kg solute/kg solvent. Note that these equations require that the phases be immiscible.

The operating equation can be derived with reference ...

Get Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.