Extraction cross-flow

A single-stage extraction using the same total volume of solvent achieves only 92% extraction, and the extract concentration is only 0.23, vs. nearly 0.25 for the cross-flow extraction. The use of four cross-flow extraction stages is clearly preferable to a single extraction. Equally, of course, the use of more than four extraction stages, each with a proportionately smaller volume, would improve the performance. In the limit, one would seek a differential contacting process similar to the Soxhlet extractor employed for extraction from solid phases, but such a contactor has not found use in solvent extraction. 

Immiscible Single-Stage and Cross-Flow Extraction... 

Exan le 13-2. Single-stage and cross-flow extraction of a protein... 

Figure 13-19. Cross-flow extraction (A) cascade, (B) solution of triai ular diagram...

Find the mixing point and solve single-stage and cross-flow extraction problems... 

Eq. (6-24) may be also applied to differential stagewise extraction operated as a stagewise cross-flow extraction process, with the number of extraction cycles tending to infinity (n oo). The extract phase may be withdrawn continuously and fresh solvent is fed. For TV, - oo. 

A For cross flow extraction in six connected vessels, the following steady-state equation holds ... 

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