Analysis of rate enhancement in a periodically operated trickle‐bed reactor

Gabarain, Leonardo; Castellari, A. T.; Cechini, J. O.; Tobolski, A.; Haure, Patricia M.

doi:10.1002/aic.690430119

Cited by 47 publications

(27 citation statements)

References 13 publications

(21 reference statements)

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“…Forced periodic operation of liquid flow must be considered as a new promising operation concept. Silveston and Hanika [199] lately reviewed periodic operation of TBRs pointing out the good results obtained for reactions including the wet oxidation of SO 2 over activated carbon [200] and the catalytic hydrogenation of a-methylstyrene [201,202] or crotonaldehyde [203]. Essentially, periodic operation consists in controlled ON-OFF liquid feed flow modulation to induce forced pulsing flow regime in the reactor.…”

Section: Reactor Type and Operationmentioning

confidence: 99%

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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Section: Reactor Type and Operationmentioning

confidence: 99%

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

et al. 2005

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“…s). s Gabarain et al (1997) proposed a 1-dimensional, pseudoopt Gabarain et al (1997) proposed a 1-dimensional, pseudoopt homogeneous model refl ecting the interpretation mentioned above. The liquid phase reaction was assumed to be zero order in AMS, while the gas phase reaction was taken to be zero order in H 2 .…”

Section: α-Methyl Styrene Hydrogenation Experimentsmentioning

confidence: 98%

Periodic Operation of Three — Phase Catalytic Reactors

Silveston

Hanika

2004

Can J Chem Eng

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Periodic operation of three phase reactors has been explored for more than two decades. This type of forcing changes selectivity and can increase either conversion or throughput. Experiments and simulation demonstrate periodic flow interruption or variation enhances reaction rates for concurrent trickle beds provided reactants are in the gas phase or can be volatilized under bed operating conditions. Temperature excursions in trickle beds can be controlled by either flow variation or switching the feed between an inert and a reactant. Several approaches to increasing rate through faster mass transfer using flow pulsing have been studied. Pulsing flow can be induced by low amplitude modulation. Periodic switching of flow direction in airlift reactors increases gas hold up and thereby the mass transfer rate. Periodic operation of three phase reactors, thus, appears to be a fertile area for engineering research.

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“…Lange et al [6,7], Castellari and Haure [8], Gabarain et al [9] and Banchero et al [10] investigated the hydrogenation of a-methyl styrene (AMS) in the presence of a palladium/alumina catalyst under ON-OFF mode operation and observed a 45~400 % improvement in conversion over the corresponding steady-state performance. Khadilkar et al [11] and Turco et al [12] also studied the AMS hydrogenation under a wide range of pressure and time-average liquid flow rate with both ON-OFF and PEAK-BASE mode operation.…”

Section: Introductionmentioning

confidence: 97%

Hydrogenation of 2‐Ethylanthraquinones in a Periodically Operated Trickle‐Bed Reactor

Liu¹,

Mi²

2005

Chem Eng & Technol

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The influence of periodic operation of a laboratory-scale trickle-bed reactor (TBR) on a consecutive reaction, the hydrogenation of 2-ethylanthraquinones (EAQs) over Pd/Al 2 O 3 , was studied. The effects of operating parameters including cycle period, split, pressure, temperature, and time-average flow rate on the performance were experimentally examined in comparison with steady-state operation on time-average liquid flow rate basis. The results showed that both conversion and selectivity, i.e., the yield of intermediate EAHQs, can be improved when the cycle period is less than 150 s and that the effect of periodic operation on selectivity becomes imperceptible when conversion is greater than 65 %.

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Analysis of rate enhancement in a periodically operated trickle‐bed reactor

Abstract: When a trickle-bed reactor (TBR) is operated periodically

Cited by 47 publications

References 13 publications

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Carbon materials and catalytic wet air oxidation of organic pollutants in wastewater

Periodic Operation of Three — Phase Catalytic Reactors

Hydrogenation of 2‐Ethylanthraquinones in a Periodically Operated Trickle‐Bed Reactor

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