Contributions to the kinetics of the iodide–iodate test reaction for micromixing time calculation with extended incorporation models

Arian, Elias; Pauer, Werner

doi:10.1016/j.ces.2021.116549

Cited by 21 publications

(25 citation statements)

References 35 publications

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“…In Figure , the values of k 1 , as now determined in accordance with eqs and , are compared with the most recent fifth-order rate laws from the literature. − Not all results are the same, but the agreement is relatively good for small ionic strength.…”

Section: Discussionmentioning

confidence: 89%

Villermaux–Dushman Test of Micromixing Characterization Revisited: Kinetic Effects of Acid Choice and Ionic Strength

Guichardon

Baqueiro

Ibaseta

2021

Ind. Eng. Chem. Res.

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The well-known Villermaux−Dushman system is nowadays widely used for examining the micromixing efficiency either in batch or continuous intensified reactors. However, a bibliographic review shows that kinetic data are too scattered for a reliable determination of the micromixing times. The Dushman reaction kinetics is then reexamined with the use of sulfuric and perchloric acids. The results confirm the fifth-order rate law. More precisely, the I − , H + , and IO 3 − dependence orders on the rate law are, respectively, 2, 2, and 1, under any condition. To be more consistent with the reactant concentrations used in the Villermaux− Dushman test, we extend their studied range, namely, 1.

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Section: Discussionmentioning

confidence: 89%

Villermaux–Dushman Test of Micromixing Characterization Revisited: Kinetic Effects of Acid Choice and Ionic Strength

Guichardon

Baqueiro

Ibaseta

2021

Ind. Eng. Chem. Res.

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“…A description of the model is originally given by Fournier et al [35]. The micromixing time calculations were performed with an extended incorporation model for sulphuric acid according to Arian and Pauer with the given concentration from Table 1 [23]. It can be assumed that for high viscosities the Dushman reaction is slowed down even further, resulting in a reduction of the reaction rate constant with higher viscosities but probably not significantly effecting the acid-base reaction.…”

Section: Discussionmentioning

confidence: 99%

“…Though, it should be mentioned that it is uncertain if the acid-base reaction only occurs with the HPO 2− 4 species or with both the HPO 2− 4 and H 2 PO − 4 species and further investigations must be conducted [23].…”

Section: Villermaux-dushman Reactionmentioning

confidence: 99%

Sucrose solution as a new viscous test fluid with tunable viscosities up to 2 Pas for micromixing characterization by the Villermaux–Dushman reaction

Arian

Pauer

2021

J Flow Chem

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For the first time, micromixing characterization for the Villermaux–Dushman reaction could be performed with a non-reactive viscous medium at viscosities up to 2 Pas. As viscous medium, sucrose solution was used with the benefit of being a Newtonian fluid with tuneable viscosity. Due to the higher viscosities in comparison to established media for micromixing investigations, a new protocol for the experimental implementation was developed. Micromixing experiments were conducted and the applicability of viscous sucrose solutions was proven in a stirred tank reactor. Major challenges in characterizing micromixing efficiency in high viscous solution were consolidated.

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“…In this work, micromixing times are calculated using a modified incorporation model, which delivers more consistent results concerning the equalization of concentration gradients. 15,17 2.1. Buffer Selection.…”

Section: + → − +mentioning

confidence: 99%

“…In recent micromixing time calculations using the incorporation model, it was unclear to which extent HPO 4 2− and H 2 PO 4 − take part in the neutralization reaction. 15 In this work, TRIS is discussed as a new buffer system. The major advantages of a TRIS buffer are that it is nontoxic and only one dissociation step must be considered, which simplifies the micromixing time calculation.…”

Section: Introductionmentioning

confidence: 99%

Progress in Buffer Choice for the Villermaux–Dushman Reaction

Arian

Pauer

2022

Ind. Eng. Chem. Res.

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TRIS [tris(hydroxymethyl)aminomethane] is proposed as a new buffer with the advantages of being nontoxic and having only one conjugated acid. Moreover, it is well-established in biochemical applications, has good solubility in water (550 g/L), and is reasonably priced. Comparable micromixing experiments in a TRIS buffer and a borate buffer led to similar segregation indices with respective micromixing times. Furthermore, TRIS was successfully transferred to experiments in viscous glycerin−water solution. Comparable micromixing experiments with sulfuric acid in TRIS highlight the importance of including the ionic strength dependency of the second dissociation constant of sulfuric acid to obtain similar micromixing times. Micromixing experiments become thereby independent of the acid choice. The application and limitation of the phosphate buffer were investigated in more detail where comparable experiments have shown that HPO 4 2− is the only species to be considered in micromixing time calculations when the HPO 4 2− /H 2 PO 4 − ratio is over 20. It is shown whether and how the effect of the ionic strength on the pK a2 value of phosphoric acid should be considered when micromixing experiments are conducted in a phosphate buffer as it is close to the dismutation pH* of iodine.

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Contributions to the kinetics of the iodide–iodate test reaction for micromixing time calculation with extended incorporation models

Cited by 21 publications

References 35 publications

Villermaux–Dushman Test of Micromixing Characterization Revisited: Kinetic Effects of Acid Choice and Ionic Strength

Villermaux–Dushman Test of Micromixing Characterization Revisited: Kinetic Effects of Acid Choice and Ionic Strength

Sucrose solution as a new viscous test fluid with tunable viscosities up to 2 Pas for micromixing characterization by the Villermaux–Dushman reaction

Progress in Buffer Choice for the Villermaux–Dushman Reaction

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