Gas and liquid distribution in the monolith film flow reactor

Heibel, Achim; Vergeldt, Frank J.; As, Henk Van; Kapteijn, Freek; Moulijn, Jacob A.; Boger, Thorsten

doi:10.1002/aic.690491203

Cited by 52 publications

(54 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since the effect of small variations in the channel flow rates on the conversion is nearly linear, the higher conversion in channels with a lower flow rate compensates for the channels with a higher flow rate. This result does not imply that a proper design of the flow distribution manifolds is not important: a bad design can actually result in large flow deviations ( r F > 0.3), which do have an effect on the reactor performance [12]. The method presented here is useful in defining a limit on what flow distribution is to be considered adequate and beyond which point improvements in the flow distributor no longer have an effect on the reactor performance.…”

Section: Reactor Conversionmentioning

confidence: 37%

“…Due to the small volume of a single channel, many parallel channels have to be used to obtain sufficient production, which makes uniform distribution of the reaction mixture over thousands or even millions of channels necessary [11]. Since flow maldistribution can affect the reactor performance [12,13], several authors have presented design studies of flow distribution manifolds [14±17]. However, besides the design of the flow distributor, also manufacturing tolerances on, for example, the diameter of the microchannels and the applied amount of catalyst coating and issues like channel blockage influence the flow distribution [8,18].…”

Section: Introductionmentioning

confidence: 40%

See 1 more Smart Citation

The Influence of Differences Between Microchannels on Micro Reactor Performance

et al. 2005

View full text Add to dashboard Cite

Microstructured reactors most often contain a large number of micrometer-sized, parallel channels, instead of a large undivided reaction volume. Individual microchannels behave as plug-flow reactors without significant axial dispersion and with excellent heat and mass transfer properties. However, since the reaction takes place in a large number of parallel channels, it is important that all channels provide equal residence time and amount of catalyst volume. These issues depend not only on the flow distributor design, but also, for example, on the manufacturing tolerances. Correlations are derived to express the conversion of a multichannel microreactor explicitly as a function of the variance of a number of reactor parameters, viz. the channel flow rate, the channel diameter, the amount of catalyst in a channel, and the channel temperature. It is shown that the influence of flow maldistribution on the overall reactor conversion is relatively small, while the influences of variations in the channel diameter and the amount of catalyst coating are more pronounced. The model outcomes are also compared to experimental results of two microreactors with different catalyst distributions, which show that the presented method is able to provide a quick, though rough estimation of the influence of differences between channels on microreactor performance.

show abstract

Section: Reactor Conversionmentioning

confidence: 37%

Section: Introductionmentioning

confidence: 40%

The Influence of Differences Between Microchannels on Micro Reactor Performance

et al. 2005

View full text Add to dashboard Cite

show abstract

“…It was introduced by Hoek et al [24] and used in various studies before [5,10,13,25,26]. A discretized form of this coefficient applied in the current work is given in Eq.…”

Section: Experimental Workmentioning

confidence: 47%

Homogeneous Gas‐Liquid Distribution for Monolithic Structures via a Needle Distributor

et al. 2017

View full text Add to dashboard Cite

Dedicated to Professor Rüdiger Lange on the occasion of his 65th birthday Structured catalysts are a widely discussed approach for process intensification of chemical multiphase reactors. But equal to common catalyst structures, homogeneous educt distribution along the catalytic surface is mandatory for high reactor performance. Especially monolithic structures require a homogeneous initial fluid distribution. A novel distribution concept for gas-liquid flow through arbitrary channel matrices is presented. It is based on the injection principle where gas and liquid are inserted directly into the channels. A prototype for different cell densities was built and tested by various measurement techniques: gravimetry, X-ray tomography, and an optical fiber sensor. Additionally, the flow regime per channel was detected as equal to single-channel conditions.

show abstract

“…The authors demonstrated that the ITS method is a viable technique for studying two-phase flows in large-scale monolith reactors. In another study, magnetic resonance imaging (MRI)-based tomography was applied by Heibel et al [20] to study the gas-liquid distribution in a monolith film flow reactor. As compared with the above-mentioned expensive methods, Behl et al [21] developed a conventional collecting technique to measure the liquid distribution across the monolith cross-section.…”

Section: Introductionmentioning

confidence: 47%

Experimental Investigation of Gas Holdup and Slug Lengths in an Upflow Monolith Reactor

Cai

Liu

et al. 2011

Chem Eng & Technol

View full text Add to dashboard Cite

A new non-invasive visualization technology was successfully developed to determine the hydrodynamics parameters of Taylor flow in monolith channels. With the developed method, the gas and liquid slug lengths as well as the gas holdup in channels of different radial positions were measured. Accordingly, the average gas holdup in different radial zones and the mean slug lengths over the monolith cross-section were calculated with varying superficial gas and liquid velocities. By defining the maldistribution factor, the degree of non-uniform distributions of these parameters over the monolith cross-section was investigated quantitatively. The results showed that a moderate gas-to-liquid velocity ratio can result in uniform distribution for both gas holdup and slug lengths. In addition, the obtained mean slug lengths were well correlated with simplified Qian and Lawal correlations.

show abstract

Gas and liquid distribution in the monolith film flow reactor

Abstract: The gas-liquid distribution in a monolith film flow reactor is in®estigated in

Cited by 52 publications

References 14 publications

The Influence of Differences Between Microchannels on Micro Reactor Performance

The Influence of Differences Between Microchannels on Micro Reactor Performance

Homogeneous Gas‐Liquid Distribution for Monolithic Structures via a Needle Distributor

Experimental Investigation of Gas Holdup and Slug Lengths in an Upflow Monolith Reactor

Contact Info

Product

Resources

About