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Individual film coefficients of mass transfer in liquid‐liquid extraction
Author(s) -
Smith G. C.,
Beckmann R. B.
Publication year - 1958
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690040212
Subject(s) - raschig ring , surface tension , chemistry , mass transfer , viscosity , mass transfer coefficient , phase (matter) , thermodynamics , base (topology) , extraction (chemistry) , chromatography , capillary action , analytical chemistry (journal) , packed bed , organic chemistry , physics , mathematical analysis , mathematics
A study has been made of the individual film coefficients of mass transfer for two binary liquid‐liquid systems of differing physical properties, namely methyl isobutyl carbinol‐water and methylethyl ketone‐water, in a 4‐in. diam. extraction column operated as a spray column and with 1/2‐in. Raschig ring packing. The value of H t for the dispersed phase was found to be a constant, C 1 for a given system in a given column. The H t values for the continuous phase could be correlated by the equation,\documentclass{article}\pagestyle{empty}\begin{document}$$(H_t )_c = C_2 (V_c /V_d )^n $$\end{document} Values of the constants C 1 , C 2 , and n are tabulated along with the values found by earlier investigators for other systems and column packings. The H t values have been reduced to area base coefficients by the expression for droplet surface area proposed by Gaylor and Pratt (3). Presaturation of either phase was found to have no effect on mass transfer rates. There appears to be relatively little difference in the efficiency of spray and packed columns for systems of low interfacial tension, but for high interfacial‐tension systems packed columns are considerably more efficient than spray columns. While no definitive correlations for the effect of physical properties are proposed, there are some indications that n is a function of the viscosity ratio of the two liquid phases and that C 2 is a function of the 1/4 power of the groups ( d Δργ/μ 2 c )(μ c /μ a ) and ( N S c ) c . No correlation was found for the effect of physical properties on ( H t ) d .