Intensification of instantaneous heterogeneous reaction by simple salts and charged microphase

Hasnat, Abul; Roy, Sharmila

doi:10.1002/aic.690440314

Cited by 1 publication

(7 citation statements)

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“…Experimental observations in our previous work, however, contradict the above-mentioned conclusions. It was observed that simple inert electrolytes as well as cetyltrimethylammonium bromide (CTAB) (as the microphase) micelle exhibit a marked influence on the mass transfer of H + ions in the instantaneous heterogeneous reaction between N , N -diethyl aniline (organic phase) and HCl (aqueous phase).…”

Section: Introductioncontrasting

confidence: 60%

“…The solubilities of organic substrates (DEA and DMP) and the critical micelle concentrations (CMCs) of SLS and CTAB surfactants in the aqueous phase were determined following the procedures as outlined previously. 8 The values of solubilities of DEA and DMP in 100 mol m -3 NaCl solution at 298 K were obtained as 35 and 1.28 mol m -3 , respectively. The CMC values obtained by the surface tension measurements were 1.4 and 0.721 mol m -3 for SLS and CTAB surfactants, respectively.…”

Section: Methodsmentioning

confidence: 95%

“…Measurement of Physicochemical Data. The solubilities of organic substrates (DEA and DMP) and the critical micelle concentrations (CMCs) of SLS and CTAB surfactants in the aqueous phase were determined following the procedures as outlined previously . The values of solubilities of DEA and DMP in 100 mol m -3 NaCl solution at 298 K were obtained as 35 and 1.28 mol m -3 , respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The location of the reaction plane is governed by the fact that at x = λ, the flux of H + (or OH - ) ion must be balanced by the flux of the organic molecule (designated as S ) where J S is the molecular diffusive flux in the region 0 < x < λ, the expression for which has been provided previously . After substituting the expressions for the respective fluxes, the equation above simplifies to where D S and S * represent the diffusivity and the interfacial concentration for the organic molecule, respectively.…”

Section: Theorymentioning

confidence: 99%

“…The previous work, however, did not consider the possible effect of distribution of two or more counterions between the micellar charged surface and the aqueous phase. The reasons cited were as follows.…”

Section: Introductionmentioning

confidence: 99%

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Microphase-enhanced Reactions: Simultaneous Effects of Ion Coupling and Counterion Binding

and

Roy

1999

Ind. Eng. Chem. Res.

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Microphase-induced enhancement of the rate of mass transfer of the reactive species in instantaneous heterogeneous reactions is described by the generalized film theory under quasi-steady-state conditions. The diffusive transport of ions which incorporates the ion-coupling phenomenon is represented by the Nernst−Planck equation. The molecular transport is described by the Fickian diffusion. In contrast to the previous investigations, a substantial increase in the relative enhancement factors (about 2 to 6 times) in the two phase reactions (between N,N-diethyl aniline and HCl in the presence of anionic surfactant sodium lauryl sulfate, and between 2,5-dimethyl phenol and NaOH in the presence of cationic surfactant cetyltrimethylammonium bromide) is observed experimentally. This increase in the rate of mass transfer of the reactive species is shown to be caused by the augmentation of the diffusion coefficients of the reactive species owing to the ion-coupling effect. Also, counterion binding of the reactive species on the micellar charged surface is analyzed within the framework of the ion-exchange equilibrium model. The solution of the resulting ion-exchange expressions in conjunction with mass-transfer model predicts the reduction in enhancement factors by 5−15%.

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Section: Introductioncontrasting

confidence: 60%

Section: Methodsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%