On the reactant concentration and the reaction kinetics in the Villermaux-Dushman protocol

Wenzel, Dennis; Assirelli, Melissa; Rossen, Heidi; Lopattschenko, Martin; Górak, Andrzej

doi:10.1016/j.cep.2018.06.022

Cited by 22 publications

(25 citation statements)

References 27 publications

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“…It is worth noting that the approach of determining partial kinetic orders from micromixing experiments seems questionable. All kinetic results obtained by this way − seem rather marginal in comparison with all others published. Each paper led to different partial orders.…”

Section: Introduction and Bibliographic Reviewcontrasting

confidence: 61%

“…It is important to reject chloride acid and nitrite acid. Cl – ion may have a catalytic effect as previously reported, ,, and NO 3 – ion may be involved in a redox reaction. As the redox potential of the oxidant is of the same order as the one of IO 3 – ions, NO 3 – may be reduced into NO by the I – ion in an acid medium.…”

Section: Introduction and Bibliographic Reviewsupporting

confidence: 58%

“…Regarding the partial kinetic orders, certain marginal results ,,− were published. It is worth noting that the approach of determining partial kinetic orders from micromixing experiments seems questionable.…”

Section: Introduction and Bibliographic Reviewmentioning

confidence: 99%

See 2 more Smart Citations

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: Introduction and Bibliographic Reviewcontrasting

confidence: 61%

Section: Introduction and Bibliographic Reviewsupporting

confidence: 58%

See 1 more Smart Citation

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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“…R2), 35‐37 the parameters proposed in 2000 by Guichardon et al 32 have mostly been applied. Regarding the choice of the acid to provide the protons, perchloric acid is preferred over sulfuric acid due to the influence of the two‐step dissociation of sulfuric acid 32,38,39 . Finally, regarding the buffer solution, 40 a boric acid buffer is preferred over a phosphate buffer due to the wider concentration range in which the buffer is stable 41 .…”

Section: Methodsmentioning

confidence: 99%

Micromixing in a gas–liquid vortex reactor

et al. 2021

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The gas–liquid vortex reactor (GLVR) has substantial process intensification potential for multiphase processes. Essential in this respect is the micromixing efficiency, which is of great importance in fast reaction systems such as crystallization, polymerization, and synthesis of nanomaterials. By creating a vortex flow and taking advantage of the centrifugal force field, the liquid micromixing process can be intensified in the GLVR. Results show that introducing a liquid into a gas‐only vortex unit results in suppression of primary and secondary gas flow. The Villermaux–Dushman protocol is applied to study the effects of the gas flow rate, liquid flow rate, and liquid viscosity based on a segregation index. Based on the incorporation model and reaction kinetics, the micromixing time of the GLVR is determined to be in the range of 10−4 ~ 10−3 s, which is comparable to the highly efficient rotating packed bed and substantially better than a static mixer.

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“…In light of the recent publications by Baqueiro et al 14 and Wenzel et al, 15 which discuss the Villermaux–Dushman method, a decision was made to revise the published results. We investigated the kinetics of the iodide–iodate reaction (the Dushman reaction), using perchloric acid as the proton source.…”

Section: Introductionmentioning

confidence: 99%