Residence time distributions in microchannels: Comparison between channels with herringbone structures and a rectangular channel

Cantú-Pérez, Alberto; Barrass, Simon; Gavriilidis, Asterios

doi:10.1016/j.cej.2009.07.023

Cited by 43 publications

(33 citation statements)

References 43 publications

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“…Several mixing structures can be found in the literature [25] and [26] among which two distinct designs were chosen: the tangential mixer [26] and [27] and the herringbone mixer [28], [29], [30], [31], [32] and [33]. While the tangential mixer turned out to require high Reynolds numbers (Re = u·d h /ν > 100) to achieve good mixing quality, the herringbone mixer is one example of a structure providing efficient mixing at low Reynolds number.…”

Section: Micromixing Structures Of Ltccmentioning

confidence: 99%

Intensification of highly exothermic fast reaction by multi-injection microstructured reactor

Haber

Jiang

Maeder

et al. 2014

Chemical Engineering and Processing: Process Intensification

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Microstructured reactors (MSR) with characteristic dimensions below 100 µm are warranted to maintain close to isothermal conditions when carrying out quasi-instantaneous highly exothermic reactions. Unfortunately, such small dimensions increase the risk of clogging, create high pressure drop and are costly to number-up. The multi-injection (MI) MSR, where one of the reactants is added stepwise along the reactor length, allows working with larger dimensions (diameter >500 µm) while maintaining good temperature control. Herein presented MI-MSR is made of low temperature co-fired ceramics (LTCC) with herringbone mixing structure inside the reactor channels and is shown to mix efficiently in a large range of Reynolds numbers Re = 20-130. The cyclization of pseudoionone is studied as a model of a highly exothermic fast reaction. The temperature profiles are characterized by a quantitative infrared thermography. The developed LTCC MI-MSR allows ∼8-fold reduction of hot spot temperature as compared to the adiabatic temperature rise. Moreover, ∼500-fold intensification is achieved as compared to the conventional semi-batch process with reduced solvent mass by a factor of 2 while attaining a yield of target product above 98%. n reaction order, [-]

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Section: Micromixing Structures Of Ltccmentioning

confidence: 99%

Intensification of highly exothermic fast reaction by multi-injection microstructured reactor

Haber

Jiang

Maeder

et al. 2014

Chemical Engineering and Processing: Process Intensification

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“…The set-up used for the RTD experiments has been previously described in detail by Cantu-Perez et al [12]. A gas:liquid ratio of 20 was used (close to the one realized in reaction experiments), where the set gas and liquid flow rates …”

Section: Hydrodynamic Studymentioning

confidence: 99%

Development of a kinetic model of ethylene methoxycarbonylation with homogeneous Pd catalyst using a capillary microreactor

Galvanin

Psyrraki

Morris

et al. 2017

Chemical Engineering Journal

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The kinetics of gas-liquid methoxycarbonylation of ethylene using 0.0013 mol/L Pd(d t bpx)(dba) homogeneous catalyst at 100 o C and 10 bar were studied in a continuous flow Hastelloy capillary microreactor of 1 mm internal diameter.Characterisation of the hydrodynamics was conducted to confirm plug flow behaviour and evaluate liquid volume fraction, both important for reactor modelling. Reaction experiments were carried out to investigate the effect of ethylene, methanol and carbon monoxide concentrations on the observed reaction rate. Vapour-liquid equilibrium was employed to calculate component concentrations at the inlet and outlet reactor conditions from the experimental data. In conjunction with a reactor model, the results were used to evaluate kinetic models based on the Pd-hydride catalytic cycle. A kinetic model considering methanolysis as the rate limiting step agreed with the experimental data. A model-based design of experiments strategy was applied for selecting the most informative experiments to achieve a precise estimation of the kinetic model parameters.

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“…The herringbone mixing structure [32][33][34] was chosen as static mixer as it was found to be efficient at low Reynolds numbers. In the experiments described in the present study, the Reynolds number were estimated to be in the range of Re≈20.…”

Section: Densitymentioning

confidence: 99%

Multi-injection microstructured reactor for intensification of fast exothermic reactions: proof of concept

Haber

Jiang²,

Maeder

et al. 2013

Green Processing and Synthesis

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Quasi-instantaneous exothermic reactions lead to the formation of unwanted hot spots even when carried out in conventional microstructured reactors (MSR) with tube diameter of 100-1000 μm. For this reason, alternative MSR designs are warranted to enable process intensification of fast reactions with characteristic reaction times < 1 s. The continuous multi-injection MSR, where one of the reactants is successively added to the main flow of reactants along reactor length, may improve temperature control. The latter was studied first theoretically using numerical simulations and then experimentally with the cyclisation of pseudoionone to α-and β-ionones as a model reaction. The multi-injection MSR made of low temperature co-fired ceramics (LTCC) led to a yield of α-ionone and β-ionone > 0.98 reaching a 500-fold process intensification as compared to the conventional semibatch process. The temperature profiles monitored by quantitative infrared thermal imaging confirmed an 8-fold reduced temperature rise compared to adiabatic temperature rise, which was achieved by injecting the reactants at three different injection points.Keywords: exothermic; microstructured reactor; multiinjection; pseudoionone; temperature. Dimensionless numbersRe Reynolds number u⋅d h /ν [-]

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Residence time distributions in microchannels: Comparison between channels with herringbone structures and a rectangular channel

Cited by 43 publications

References 43 publications

Intensification of highly exothermic fast reaction by multi-injection microstructured reactor

Intensification of highly exothermic fast reaction by multi-injection microstructured reactor

Development of a kinetic model of ethylene methoxycarbonylation with homogeneous Pd catalyst using a capillary microreactor

Multi-injection microstructured reactor for intensification of fast exothermic reactions: proof of concept

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