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

Asai, Satoru; Nakamura, H; Sumita, Toshihiko

doi:10.1002/aic.690401212

Cited by 21 publications

(14 citation statements)

References 10 publications

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“…19 Three cases are considered, namely, (i) measurements of all species in both phases, (ii) measurements of the kinetic species and equilibrium components in the phase where the instantaneous equilibria take place (phase G), and (iii) measurements of a mix of kinetic species, equilibrium components, and equilibrium species in phase G.…”

Section: Case Studymentioning

confidence: 99%

Identification of Multiphase Reaction Systems with Instantaneous Equilibria

Srinivasan

Billeter

Bonvin

2016

Ind. Eng. Chem. Res.

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The identification of kinetic models for multiphase reaction systems is complex due to the simultaneous effect of chemical reactions and mass transfers. The extentbased incremental approach simplifies the modeling task by transforming the reaction system into variant states called vessel extents, one for each rate process. This transformation is carried out from the measured numbers of moles (or concentrations) and requires as many measured species as there are rate processes. Then, each vessel extent can be modeled individually, that is, independently of the other dynamic effects. This paper presents a modified version of the extent-based incremental approach that can be used to identify multiphase reaction systems in the presence of instantaneous equilibria. Different routes are possible depending on the number and type of measured species. The approach is illustrated via the simulated example of the oxidation of benzyl alcohol by hypochlorite in a batch reactor.

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Section: Case Studymentioning

confidence: 99%

Identification of Multiphase Reaction Systems with Instantaneous Equilibria

Srinivasan

Billeter

Bonvin

2016

Ind. Eng. Chem. Res.

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“…The detailed kinetics for the synthesis of di‐ n ‐butyl sulphide using phase transfer catalyst was explained assuming a pseudo‐first‐order reaction in 1‐bromobutane by Wang and Tseng . Oxidation of BA using sodium hypochlorite using phase transfer catalyst has been studied by several researchers, both theoretically and experimentally . Some of these studies involve experiments with a flat interface …”

Section: Introductionmentioning

confidence: 99%

“…[12] Oxidation of BA using sodium hypochlorite using phase transfer catalyst has been studied by several researchers, both theoretically and experimentally. [8,[13][14][15][16] Some of these studies involve experiments with a flat interface. [8] In this work we follow Bhattacharya and Mungikar [2] and Chen et al [11] and assume the reactions in the aqueous phase to be fast and the species to be in equilibrium.…”

Section: Introductionmentioning

confidence: 99%

“…[8,[13][14][15][16] Some of these studies involve experiments with a flat interface. [8] In this work we follow Bhattacharya and Mungikar [2] and Chen et al [11] and assume the reactions in the aqueous phase to be fast and the species to be in equilibrium. In the model development, the aqueous phase is assumed to be the continuous phase and the organic phase the dispersed phase.…”

Section: Introductionmentioning

confidence: 99%

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Experimental validation of equilibrium based mathematical modelling of liquid‐liquid phase transfer catalysis

Vir

Pushpavanam

2017

Can J Chem Eng

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The reaction between two compounds which reside in immiscible phases can be accelerated using a phase transfer catalyst. The catalyst helps to transfer a species ion from one phase to the other phase, thus promoting its reaction. Several mechanisms have been proposed to describe phase transfer catalyzed reactions. In this work, we have carried out an experimental and theoretical study of phase transfer catalysis in batch mode. A mathematical model is developed which helps to predict the progress of the reaction under different operating conditions. Here the different species in the aqueous phase are assumed to be in equilibrium and these react with the species in the organic phase. The effect of diffusional resistance inside the dispersed organic phase is shown to be negligible. The two reaction systems studied are the phase transfer catalyzed (i) thioetherification and (ii) benzyl alcohol oxidation using sodium hypochlorite. Batch experiments were performed to determine the effect of catalyst loading, solvent dilution, and pH. The experimental results show that with an increase in catalyst loading, the phase transfer catalyzed reactions were accelerated. The use of a minimal amount of solvent results in a better performance. Benzyl alcohol oxidation is favoured under low pH conditions. The developed model is able to capture the performance of the system over a wide range of operating conditions accurately.

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“…Reaction rate of PTC assisted alkaline hydrolysis of n ‐butyl acetate and oxidation of benzyl alcohol in an agitated vessel was analyzed by Asai et al . The investigation revealed that overall reaction rate was proportional to the interfacial concentration of the actual reaction components.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of butyl 2‐(4‐methoxyphenyl) acetate in biphasic system using low concentration of potassium hydroxide—kinetic aspects

Vivekanand

Wang

2012

Asia-Pacific J Chem Eng

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In this paper, we present an experimental protocol for following the kinetics of phase‐transfer catalyzed synthesis of butyl 2‐(4‐methoxyphenyl) acetate from the esterification of 4‐methoxyphenylacetic acid with the presence of potassium hydroxide as a base and potassium carbonate by gas chromatography. Hydrolysis of the ester product was curtailed by using low concentration of potassium hydroxide and potassium carbonate (inorganic salt) during esterification. The reaction is greatly enhanced by adding a small quantity of phase‐transfer catalyst (kapp = 4.75 × 10−3 min−1). Rate of esterification was investigated at various experimental parameters, namely. stirring speed, amount of catalyst, different solvents, different volumes of water, different inorganic salts, different phase transfer catalysts and temperature. When the degree of agitation exceeded 20.93 rad.s−1, the mass transfer resistance for the reaction can be ignored. As the catalyst amount was increased (from 0.5 to 1.2 g), the rate constant values also increased (from 2.32 × 10−3 min−1 to 6.13 × 10−3 min−1). A kinetic model was proposed for the esterification, and the experimental data were well described by the pseudo‐first‐order equation. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.

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

Abstract: .

Cited by 21 publications

References 10 publications

Identification of Multiphase Reaction Systems with Instantaneous Equilibria

Identification of Multiphase Reaction Systems with Instantaneous Equilibria

Experimental validation of equilibrium based mathematical modelling of liquid‐liquid phase transfer catalysis

Synthesis of butyl 2‐(4‐methoxyphenyl) acetate in biphasic system using low concentration of potassium hydroxide—kinetic aspects

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