An Experimental Study of Micromixing Using Two Parallel Reactions

Bourne, J.R.; Yu, Shu-Hung

doi:10.1007/978-94-015-7973-5_24

Cited by 8 publications

(11 citation statements)

References 3 publications

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“…At standard conditions, k 1 = 1.4 × 10 8 mol/(m 3 s) and k 2 = 0.023 mol/m 3 s (Bourne and Yu, 1991). Thus, the first reaction is some 10 orders of magnitude faster than the second one.…”

Section: Reaction Schemementioning

confidence: 93%

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Hydrodynamic effects on mixing and competitive reactions in laboratory reactors

Akiti

Yeboah

Bai

et al. 2005

Chemical Engineering Science

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“…At standard conditions, k 1 = 1.4 × 10 8 mol/(m 3 s) and k 2 = 0.023 mol/m 3 s (Bourne and Yu, 1991). Thus, the first reaction is some 10 orders of magnitude faster than the second one.…”

Section: Reaction Schemementioning

confidence: 93%

“…The kinetics no longer plays a role in the process, and X s = C C /(C B + C C ) = 0.5. In any real system, 0 < X S < 0.5, and the value of X S can be taken as an indication of mixing effectiveness: the lower the X S , the better the (micro)mixing (Bourne and Yu, 1991;Akiti and Armenante, 2004).…”

Section: Reaction Schemementioning

confidence: 99%

Hydrodynamic effects on mixing and competitive reactions in laboratory reactors

Akiti

Yeboah

Bai

et al. 2005

Chemical Engineering Science

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“…In these years, some fast competitive chemical reaction systems were developed and many researchers adopted them to measure the micromixing efficiency in conventional reactors and novel reactors . The most commonly used test systems are categorized into consecutive competitive reactions and parallel competitive reactions, such as the iodide–iodate reaction, the coupling of 1‐naphthol with diazotized sulfanilic acid reaction and the alkaline hydrolysis of ethyl chloroacetate reaction . Among these, the iodide–iodate reaction, long known as the Dushman reaction, is currently one of the most popular reaction systems to characterize micromixing efficiency owing to its convenience, safety and low cost …”

Section: Introductionmentioning

confidence: 99%

Micromixing efficiency in a rotating foam stirrer reactor with various reactor configurations and liquid viscosities

Yang

Ouyang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The rotating foam stirrer reactor (RFSR) has shown its high mass transfer efficiency. Nevertheless, its micromixing efficiency, which is one of the significant parameters, still needs more comprehensive study for its better application and optimization. This work therefore employed the iodide–iodate reaction system to analyze the micromixing efficiency in an RFSR, and the effects of reactor configuration and liquid viscosity on micromixing efficiency were investigated. RESULTS The results show that high micromixing efficiency can be achieved when the feed location is at the outer edge of the rotor. Solid foam with low pores per linear inch (ppi) and equipping baffles on the reactor wall can also considerably improve the micromixing efficiency. The results further reveal that the micromixing efficiency decreased with increasing liquid viscosity. Micromixing times in an RFSR with various configurations, estimated based on the incorporation model, ranged from 2.1 × 10−4 to 2.0 × 10−2 s. The minimum value is smaller than that of many conventional reactors and is competitive with that of some novel reactors. In addition, a correlation to predict the micromixing time based on the average energy dissipation rate was developed, which agreed well with experimental values. CONCLUSION This study indicates that the RFSR has excellent micromixing efficiency and also provides fundamental information for optimization of the RFSR and its application in process industries. © 2019 Society of Chemical Industry

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“…This is not realistic. A solution to this problem is to experimentally determine t crit for the worst possible set of experimental conditions, that is, lowest agitation speed, highest initial concentration of reactant A , and a feed location near the surface (Bourne and Yu, 1991), where turbulence intensity is lower than at other feed locations. Then, this value of t crit can be used for all the other less demanding experimental conditions.…”

Section: Resultsmentioning

confidence: 99%

“…The parallel competing reaction set examined in this work was as follows (Bourne and Yu, 1994) The rate constants k 1 and k 2 are, respectively, 1.3 × 10 8 m 3 /(mol · s) and 0.0257 m 3 /(mol · s) at 23°C (Bourne and Yu, 1991). The final product distribution is sensitive to hydrodynamic effects (Baldyga and Bourne, 1989b; Bourne and Yu, 1991, 1994), making this reaction set suitable for studying the effect of mixing and turbulence on chemical reactions. Of interest is the yield of forming S from A .…”

Section: Reaction Systemmentioning

confidence: 99%