Liquid-liquid mass transfer in an agitated vessel with a flat interface.

Abstract

Mass transfer between two phases was studied in an agitated vessel with a flat liquid-liquid interface for 30 systems, where physical properties varied in a wide range. The observed Sherwood numbers for the first-phase Sh{ were correlated in terms of the first-phase Reynolds number Re19 modified second-phase Reynolds number Re2 \ Schmidt number Sc1 9 Capillary number Cax and a function of viscosity ratio <P. The correlation obtained represents all the data with an average deviation of 12.7%: Sh< =0.0U9Sci1 3Ca16ll3l&4Re13 +to2/8/3]1 4

Investigation of chitosan gelation mechanisms by a modeling approach coupled to local experimental measurement

“…Therefore, a flux condition was applied at the liquid/liquid boundary (η = 0.5) and the flux J 1 (kg/m 2 s) was written as follows where k ′ 1 (m/s) was the mass transfer coefficient of ammonia in forced convection and Δρ 1 (kg/m 3 ) was the gradient of ammonia concentration between both liquid phases. k ′ 1 could be expressed from the expression of the Sherwood number given by Asai et al (1983)30 The semiempirical correlation involving the Sherwood number has been obtained in a liquid/liquid reactor without any break‐up of the flat interface. In Eq.…”

Oxidation of benzyl alcohol using hypochlorite ion via phase‐transfer catalysis

“…The organic solvents used were benzene, toluene, 1,2-dichIoroethane, and chloroform, and the phase-transfer catalysts were cetyltrimethylammonium chloride (CTMAC), cetyltrimethylammonium bromide (CTMAB), tetrabutylammonium bromide (TBAB), tetrabutylphosphonium bromide (TBPB), and trioctylmethylammonium chloride (TOMAC). The experimental apparatus used in this study was an agitated vessel with a flat interface, similar to that used in a previous work (Asai et al, 1983). Both the organic and aqueous phases had equal volumes.…”

“…9 6~ lo-'' m2/s, respectively, at 303 K by using the Nernst-Planck equation in line with the previous work (Asai et al, 1991). The diffusivities of cetyltrimethylammonium salts, Q'OCl-, Q'Cl-, and Q'Br-in the aqueous mixed electrolyte solutions for the reactive systems were predicted from the following equation on the basis of the correlation of Hikita et al (1979): The mass-transfer coefficients kLj and kLj of relevant species in the organic and aqueous phases, respectively, were predicted from the empirical correlation of Asai et al (1983). Figure 2 illustrates the effect of the bulk concentration of C6H5CH20H in the organic phase on the overall reaction rates N, of Q'OCI-at 0.005 and 0.01 kmol/m3 CTMAB (Q'Br-).…”

Kinetics of the extraction of uranium(VI) from nitric acid solutions with bis(2-ethylhexyl)phosphoric acid

“…Hence, the maximum possible extraction rate can be expressed as R = k' [H2R2] in this study, where k'is the interfacial masstransfer coefficient of HDEHP in this extraction system and can be evaluated with the empirical correlation given by Asai et al (1983), who used an agitated vessel geometrically similar to the transfer cell of our own in evaluating the value of k'. Hence, the maximum possible extraction rate can be expressed as R = k' [H2R2] in this study, where k'is the interfacial masstransfer coefficient of HDEHP in this extraction system and can be evaluated with the empirical correlation given by Asai et al (1983), who used an agitated vessel geometrically similar to the transfer cell of our own in evaluating the value of k'.…”

“…Hence, the maximum possible extraction rate can be expressed as R = k' [H2R2] in this study, where k'is the interfacial masstransfer coefficient of HDEHP in this extraction system and can be evaluated with the empirical correlation given by Asai et al (1983), who used an agitated vessel geometrically similar to the transfer cell of our own in evaluating the value of k'. The interfacial tension was estimated to be 3.84 X N/m, by referring to those tensions reported by Asai et al (1983). Since kerosene is a mixture of saturated hydrocarbons containing chiefly ClO-Cl6 alkanes, the properties of n-dodecane were used to represent those of kerosene in calculating the diffusivity of HDEHP in the organic phase.…”