Mathematical Modeling of Isotermal Plug Flow Reactor with Consecutive Reaction Taking into Account the Catalyst Deactivation

A packed-bed plug-flow reactor, denoted as the lab-scale liquid-solid (LS)² reactor, has been developed for the assessment of heterogeneous catalyst deactivation in liquid-phase reactions. The possibility to measure intrinsic kinetics was first verified with the model transesterification of ethyl acetate with methanol, catalyzed by the stable commercial resin Lewatit K2629, for which a turnover frequency (TOF) of 6.2 ± 0.4 × 10−3 s−1 was obtained. The absence of temperature and concentration gradients was verified with correlations and experimental tests. The potential for assessing the deactivation of a catalyst was demonstrated by a second intrinsic kinetics evaluation where a methylaminopropyl (MAP)-functionalized mesoporous silica catalyst was used for the aldol reaction of acetone with 4-nitrobenzaldehyde in different solvents. The cooperative MAP catalyst deactivated as a function of time on stream when using hexane as solvent. Yet, the monofunctional MAP catalyst exhibited stable activity for at least 4 h on stream, which resulted in a TOF of 1.2 ± 0.1 × 10−3 s−1. It did, however, deactivate with dry acetone or DMSO as solvent due to the formation of site-blocking species. This deactivation was mitigated by co-feeding 2 wt % of water to DMSO, resulting in stable catalyst activity.

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Transient isotopic tracing of nickel catalyst deactivation in a plug-flow reactor

Applied Catalysis A General ◽

10.1016/s0926-860x(96)00291-8 ◽

1997 ◽

Vol 151 (1) ◽

pp. 97-107 ◽

Cited By ~ 2

Author(s):

Masood Otarod ◽

John Happel ◽

Yee Soong ◽

Eric Walter ◽

Luc Pronzato

Keyword(s):

Nickel Catalyst ◽

Catalyst Deactivation ◽

Flow Reactor ◽

Plug Flow ◽

Plug Flow Reactor ◽

Isotopic Tracing

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Kinetics and Product Selectivity (Yield) of Second Order Competitive Consecutive Reactions in Fed-Batch Reactor and Plug Flow Reactor

ISRN Chemical Engineering ◽

10.1155/2013/591546 ◽

2013 ◽

Vol 2013 ◽

pp. 1-17 ◽

Cited By ~ 2

Author(s):

Subash Chandra Bose Selvamony

Keyword(s):

Flow Reactor ◽

Batch Reactor ◽

Plug Flow ◽

Second Order ◽

Plug Flow Reactor ◽

Effect Of Temperature ◽

Product Selectivity ◽

Fed Batch ◽

Consecutive Reaction ◽

Consecutive Reactions

This literature compares the performance of second order competitive consecutive reaction in Fed-Batch Reactor with that in continuous Plug Flow Reactor. In a kinetic sense, this simulation study aims to develop a case for continuous Plug Flow Reactor in pharmaceutical, fine chemical, and related other chemical industries. MATLAB is used to find solutions for the differential equations. The simulation results show that, for certain cases of nonelementary scenario, product selectivity is higher in Plug Flow Reactor than Fed-Batch Reactor despite the fact that it is the same in both the reactors for elementary reaction. The effect of temperature and concentration gradients is beyond the scope of this literature.

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