Dispersion‐free solvent extraction with microporous hollow‐fiber modules

AICHE Journal - Tập 34 Số 2 - Trang 177-188 - 1988
Ravi Prasad1, Kamalesh K. Sirkar1
1Department of Chemistry and Chemical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030

Tóm tắt

AbstractExtensive studies on dispersion‐free solvent extraction have been carried out using modules made with either hydrophobic or hydrophilic microporous hollow‐fiber membranes. Membrane and boundary layer resistances have been characterized for both kinds of hollow fiber using solvent extraction systems with a wide variation of distribution coefficients and interfacial tensions. It has been found that the Graetz solution for a constant wall concentration describes satisfactorily mass transfer on the lumen side of a hollow‐fiber device. A correlation of the form NSh = [Dh(1 − ϕ)/L]NN appears to provide a close fit to the shell‐side mass transfer coefficient data. The perforamnce characteristics of dispersion‐free extraction in hollow‐fiber modules have been considered against those of commercial packed‐bed extractors. A perspective has been provided on comparative utilities of hydrophobic or hydrophilic hollow fibers for a given solvent extraction problem.

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AICHE Journal

Tập 34 Số 2

177-188

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