Influence of reagents choice (buffer, acid and inert salt) on triiodide production in the Villermaux–Dushman method applied to a stirred vessel

Baqueiro, Carlos; Ibaseta, Nelson; Guichardon, Pierrette; Laurent, Fabrice

doi:10.1016/j.cherd.2018.04.017

Cited by 23 publications

(27 citation statements)

References 32 publications

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“…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 . Compared to a phosphate buffer, it is more favorable when experimental results using this buffer are compared with literature data.…”

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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Section: Methodsmentioning

confidence: 99%

Micromixing in a gas–liquid vortex reactor

et al. 2021

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“…Boric acid is classified as toxic for reproduction by the CLP Regulation and REACH, it has also a limited solubility in water and other potential media [19,20]. Therefore, the borate buffer was replaced by a new promising buffer which is a phosphate buffer [9,21].…”

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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“…The effect of the acid choice is also an important parameter, while we find in the literature studies involving the perchloric acid in the micromixing characterization with the Villermaux− Dushman test. 37,38 Any doubt concerning the kinetics has to be removed to estimate reliable micromixing times via micromixing models.…”

Section: Introduction and Bibliographic Reviewmentioning

confidence: 99%

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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Influence of reagents choice (buffer, acid and inert salt) on triiodide production in the Villermaux–Dushman method applied to a stirred vessel

Cited by 23 publications

References 32 publications

Micromixing in a gas–liquid vortex reactor

Micromixing in a gas–liquid vortex reactor

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

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

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