A Novel Approach for Measuring Gas Solubility in Liquids Using a Tube‐in‐Tube Membrane Contactor

Wu, Gaowei; Cao, Enhong; Kuhn, Simon; Gavriilidis, Asterios

doi:10.1002/ceat.201700196

Cited by 21 publications

(11 citation statements)

References 32 publications

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“…The maximum conversion of 31.7 ± 6.1% was consistent with a gas-limited system described by Yang and Jensen based on mass transfer modeling [24]. This result confirmed that the sparger serves to facilitate oxygen solubilization into the liquid stream according to Henry's law, which is a similar result to previous reports for industrially relevant gas/liquid reactions [25,26,28,32]. Conversion can be increased by diluting the substrate; however, dilution decreases the reactor productivity [10,26].…”

Section: Resultssupporting

confidence: 88%

“…Alternatively, Gavriilidis and co-workers built a tube-in-tube membrane reactor for selective oxidation of neat benzyl alcohol to benzaldehyde [22]. The role of the tube-in-tube membrane reactor was to facilitate the gas oxidant diffusion into the reacting liquid to feed to the catalytic packed bed [8,10,[22][23][24][25][26][27][28][29]. They found that the tube-in-tube reactor improved the catalyst contact with both benzyl alcohol and oxygen simultaneously, resulting in increased conversion and selectivity.…”

Section: Introductionmentioning

confidence: 99%

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Improving Productivity of Multiphase Flow Aerobic Oxidation Using a Tube-in-Tube Membrane Contactor

et al. 2019

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The application of flow reactors in multiphase catalytic reactions represents a promising approach for enhancing the efficiency of this important class of chemical reactions. We developed a simple approach to improve the reactor productivity of multiphase catalytic reactions performed using a flow chemistry unit with a packed bed reactor. Specifically, a tube-in-tube membrane contactor (sparger) integrated in-line with the flow reactor has been successfully applied to the aerobic oxidation of benzyl alcohol to benzaldehyde utilizing a heterogeneous palladium catalyst in the packed bed. We examined the effect of sparger hydrodynamics on reactor productivity quantified by space time yield (STY). Implementation of the sparger, versus segmented flow achieved with the built in gas dosing module (1) increased reactor productivity 4-fold quantified by space time yield while maintaining high selectivity and (2) improved process safety as demonstrated by lower effective operating pressures.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Improving Productivity of Multiphase Flow Aerobic Oxidation Using a Tube-in-Tube Membrane Contactor

et al. 2019

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“…Based on these considerations, the relatively mild reducing agent CO, was chosen in order to better control the first 'fast reduction' stage instead of cooling reactants as favoured by other researchers. A tube-in-tube contactor was employed to saturate an organic carrier with CO. Based on Henry's law, the amount of dissolved gas in the liquid at equilibrium is proportional to its partial pressure in the gas phase [21]. Therefore the concentration of CO could be tuned by pressurising the microfluidic system.…”

Section: Adaptation Of the Synthetic Process From Batch To Flowmentioning

confidence: 99%

Rapid synthesis of [Au25(Cys)18] nanoclusters via carbon monoxide in microfluidic liquid-liquid segmented flow system and their antimicrobial performance

Huang

Hwang

et al. 2020

Chemical Engineering Journal

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Atomically precise thiolate-gold nanoclusters with well-defined structures attract attention for use in various applications. However, most of the recently reported synthetic methods rely on prolonged synthesis times (a few hours to days) in order to produce high purity products with a single cluster size. Such extended synthesis times make these processes ill-suited for adaptation to industrial scale production with continuous flow. In this work, an improved method for the synthesis of thiolated Au25 nanoclusters is presented utilising a continuous flow microfluidic system and CO-mediated reduction. The optimised system based on a coiled flow inverter with inner diameter of 1 mm operating at 80 °C and 500 kPa took only 3 min for the synthesis of atomically precise cysteine-capped [Au25(Cys)18] nanoclusters, as characterised by ultraviolet-visible spectroscopy and electrospray ionization mass spectrometry. The productivity of the system was increased by using higher reactant concenctrations which led to a throughput of 0.9 gAu per day, without changing the reaction time or affecting the product purity. The Au nanoclusters were used as photobactericidal enhancement materials. In antimicrobial testing against S. aureus, encapsulation of the Au nanoclusters into crystal violet impregnated silicone showed high photobactericidal activity (~1.7 log reduction in viable bacteria) upon 6 h illumination of white light at ~ 312 lux, while crystal violet did not show significant photobactericidal activity on its own.

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“…With the tube‐in‐tube reactor, they also established an inline titration technique to measure the CO 2 and NH 3 concentration in flowing liquids . 30‐33 Wu and co‐workers have developed a novel method with a bubble meter for measuring gas solubility in organic solvents using a tube‐in‐tube membrane contactor 34 . More recently, by using a gas mass flowmeter to record the change of gas flow rate across the membrane with time, we have built a flow platform for studying gas–liquid systems with the tube‐in‐tube reactor, which have realized the rapid measurement of gas solubility, 22 gas diffusion coefficient in liquids 2 and reaction rate constant of fast gas–liquid reactions 24 .…”

Section: Introductionmentioning

confidence: 99%

Rapid measurement of gas diffusivity in liquids using a tube‐in‐tube reactor with an unsteady‐state strategy

Zhou

Xie

et al. 2020

AIChE Journal

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In this work, an unsteady-state strategy for rapid measurement of gas diffusivity in liquid is proposed, which has a quick perturbation of the liquid flow rate in inner tube for obtaining the change of gas flow rate across the membrane with time. The strategy has taken full advantages of the tube-in-tube reactor that possesses a high permeability Teflon AF-2400 membrane to accelerate the diffusion rate of gas to liquid without direct contact between the two phases. With a developed mathematical model fitting the recorded variation of gas flow rate with time, the gas diffusivity in liquid can be determined within 0.5-3 min compared with the conventional methods of 4-14 hr. In addition, the strategy is demonstrated with several gas-liquid systems (O 2-DMSO, CO 2-[Emim] [NTf 2 ] and CO 2-[Bmim] [BF 4 ]) with varied viscosities and temperatures, showing a good agreement with literature values with less than 10% deviation.

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A Novel Approach for Measuring Gas Solubility in Liquids Using a Tube‐in‐Tube Membrane Contactor

Cited by 21 publications

References 32 publications

Improving Productivity of Multiphase Flow Aerobic Oxidation Using a Tube-in-Tube Membrane Contactor

Improving Productivity of Multiphase Flow Aerobic Oxidation Using a Tube-in-Tube Membrane Contactor

Rapid synthesis of [Au25(Cys)18] nanoclusters via carbon monoxide in microfluidic liquid-liquid segmented flow system and their antimicrobial performance

Rapid measurement of gas diffusivity in liquids using a tube‐in‐tube reactor with an unsteady‐state strategy

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