On the Modeling of the Kinetics of the Selective Deactivation of Catalysts. Application to the Fluidized Catalytic Cracking Process

Corella, José

doi:10.1021/ie040033d

Cited by 46 publications

(40 citation statements)

References 32 publications

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“…An integrated reactor-regenerator model, using five kinetic lumps with 9 cracking reactions in the riser reactor has been investigated by Dave and Saraf [14]. A selective deactivation kinetic model is more accurate and realistic than the non-selective model, which has been studied by Corella [15].…”

Section: Introductionmentioning

confidence: 99%

Parametric Sensitivity Studies in a Commercial FCC Unit

Dasila¹,

Choudhury²,

Saraf³

et al. 2012

ACES

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A steady state model was developed for simulating the performance of an industrial fluid catalytic cracking (FCC) unit which was subsequently used in parametric sensitivity studies. The simulator includes kinetic models for the riser reactor and the regeneration systems. Mass and energy balances were performed for each of these sections and simulation results were compared with the plant data available in the literature. Model predictions were found to be in close agreement with the reported data. Finally this validated model was used for studying the effects of independent variables such as feed preheat temperature (T feed ) and feed flow rate (F feed ) on the unit performance at either fixed regenerated catalyst temp/regenerator temp (T rgn ) or constant reactor outlet temperature (ROT). The catalyst circulation rate (CCR) was automatically adjusted to keep the ROT constant with varying the independent variables feed preheat temperature while the air rate adjusted for keeping the regenerator temperature constant which consequences the dependency of both dependent and independent variables on the unit performance. The air flow rate to the regenerator was also an independent variable during the parametric sensitivity analysis and its effect on FCC performance was investigated at constant T feed , F feed and CCR. Combining all the sensitivity analysis, it has been found to increase gas oil conversion and product yields by 5 to 6 percent with decrease of say, 10 K, in the feed preheat temperature (T feed ) and corresponding increase in air rate (F air ) and catalyst circulation rate (F rgc ) at constant reactor outlet temperature (ROT) and regenerated catalyst temperature (T rgc ).

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Section: Introductionmentioning

confidence: 99%

Parametric Sensitivity Studies in a Commercial FCC Unit

Dasila¹,

Choudhury²,

Saraf³

et al. 2012

ACES

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“…It is well known that the coke deposition on the catalyst surface affects not only its activity (affecting the conversion of the reactants), but also its selectivity (affecting the product distribution) [18]. That is, the deactivation of the catalyst may affect each one of the reactions in a reaction network (a lumping scheme in the case of FCC modeling) in different ways.…”

Section: Introductionmentioning

confidence: 99%

Five-lump kinetic model with selective catalyst deactivation for the prediction of the product selectivity in the fluid catalytic cracking process

et al. 2007

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“…where i is the lumped component, a i represents the concentration of i th lump in vapor, G v denotes the vapor mass flow rate across the riser, r j represents the rate of the j th reaction, and k ′ is the kinetic constant of the j th reaction. f ( A ) = 1/(1 + K A ( C A + C R + C B )) indicates the effect of heavy aromatics adsorption on catalyst activity , f ( N ) = 1/(1 + K N C N ) the effect of basic nitrogen of the feedstock on catalyst activity , and

φ (t_{normalc}) = e^{- β t_{c}}

the effect of coke formation on the activity of the catalyst . It is considered that the coke formation rate of the catalyst is only a function of the residence time of the catalyst.…”

Section: Kinetic Modelingmentioning

confidence: 99%

Optimization of a Fluid Catalytic Cracking Kinetic Model by Improved Particle Swarm Optimization

2019

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Fluid catalytic cracking (FCC) kinetic models are characterized by high dimension, nonlinearity, discontinuity, and non-differentiability. Particle swarm optimization is easy to fall into local optima prematurely when it is applied to the optimization of kinetic models. To solve this problem, an improved two-swarm cooperative particle swarm optimization (ITCPSO) is proposed. Considering the reaction mechanism of FCC, an 8-lumps kinetic model was developed. According to the pilot data, nine PSO algorithms and ITCPSO are presented to estimate the parameters. The results demonstrate that better performance of global searching is gained by ITCPSO compared to other PSOs, thus, ITCPSO is expected to be implemented in the optimization of complex kinetic models.

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On the Modeling of the Kinetics of the Selective Deactivation of Catalysts. Application to the Fluidized Catalytic Cracking Process

Cited by 46 publications

References 32 publications

Parametric Sensitivity Studies in a Commercial FCC Unit

Parametric Sensitivity Studies in a Commercial FCC Unit

Five-lump kinetic model with selective catalyst deactivation for the prediction of the product selectivity in the fluid catalytic cracking process

Optimization of a Fluid Catalytic Cracking Kinetic Model by Improved Particle Swarm Optimization

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