Comparison between fixed fluidized bed (FFB) and batch fluidized bed reactors in the evaluation of FCC catalysts

Passamonti, Francisco Javier; Puente, Gabriela de la; Gilbert, William R.; Morgado, E.; Sedrán, Ulises

doi:10.1016/j.cej.2011.12.081

Cited by 29 publications

(31 citation statements)

References 37 publications

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“…The amounts of Brönsted and Lewis acid sites were calculated from the integrated absorbance of the bands at 1545 and 1450-1460 cm -1 , respectively, by means of the integrated molar extinction coefficients, which are considered independent from the catalyst and site strength. 25,26 Reaction times in the experiments were 2 and 6 s, reaction temperature was 450 ºC, which is used in units operating in the middle distillates mode, 27 and mass catalyst to oil (solution) relationship was 1.12. Since most of the reactants are solid at room temperature, they were dissolved into benzene (99%, Cicarelli) in order to feed them easily to the reactor.…”

Section: Methodsmentioning

confidence: 99%

Catalytic Cracking of Heavy Aromatics and Polycyclic Aromatic Hydrocarbons over Fluidized Catalytic Cracking Catalysts

2015

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The distribution of products in the range of gasoline and middle distillates cuts obtained in the catalytic cracking of heavy aromatics and polycyclic aromatic hydrocarbons over a FCC catalyst was studied. 1-Phenyloctane, biphenyl, fluorene, 9,10-dihydrophenanthrene, naphthalene, phenanthrene, pyrene and benz [a]anthracene were used as model compounds of alkylaromatic, naphthenic-aromatic and polyaromatic hydrocarbons which are present in VGO and residual feedstocks in the FCC process. The catalyst was used in its fresh and equilibrium forms at 450 ºC in a CREC Riser Simulator reactor with reaction times from 2 to 6 s. Thermal cracking reactions overwhelm the catalytic conversion of naphthenic-aromatic compounds such as fluorene and 9,10-dihydrophenanthrene. Under the same conditions, the fresh catalyst was more active than the equilibrium catalyst. The alkylaromatic, naphthenicaromatic and polyaromatic hydrocarbons, showed catalytic conversions which increased, CORRESPONDING AUTOR *were relatively stable and decreased, respectively, as a function of reaction time. The distribution of products suggested that most important reactions were thermal dehydrogenation, hydrogen transfer, ring opening, cracking and condensation. It was shown that all the model compounds are cracked, yielding particularly benzene in the gasoline range and coke.

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Section: Methodsmentioning

confidence: 99%

Catalytic Cracking of Heavy Aromatics and Polycyclic Aromatic Hydrocarbons over Fluidized Catalytic Cracking Catalysts

2015

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“…The unit has been described comprehensively elsewhere [18,19]. Reaction times in the experiments were from 1 to 8 s, temperature was 450 • C and catalyst to oil relationship was 1.12.…”

Section: Methodsmentioning

confidence: 99%

Formation of aromatics in heavy gasoline and light LCO ends in FCC

Pujro

Falco

Sedrán

2015

Applied Catalysis A: General

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“…However, due to some inconveniences (Sedran, 1994), a large number of configurations and operative approaches for MAT units has been developed (Corma and Sauvanaud 2013;Rawet et al, 2001). Flow reactors with a confined fluidized bed (FFB) are used similarly, that is, with a time averaging approach, and have become very familiar in FCC laboratories (Biswas and Maxwell, 1990;Passamonti et al, 2012). …”

Section: Introductionmentioning

confidence: 99%

“…The unit was designed specifically to address FCC studies and ideally mimics the riser reactor in commercial units, following the analogy between position in the riser and reaction or residence time in the laboratory unit. The reactor was previously used in the study of various subjects related to FCC, such as catalyst evaluation (Gilbert, et al, 2011), kinetic and diffusive modeling (Bidabehere and Sedran, 2001;de la Puente and Sedran, 2000), new operative modes (de la Puente et al, 1999;Spretz and Sedran, 2001;Tiscornia et al, 2002) and recycling of waste plastic (Passamonti et al, 2012). Nevertheless, the statistical analysis of its performance is necessary in order to confirm its capacities.…”

Section: Introductionmentioning

confidence: 99%

Reliable Laboratory Reactor Data Analysis: Evaluation of Commercial FCC Catalysts in a Batch Fluidized Bed Reactor

Río

Passamonti

Sedrán

2015

Chemical Engineering Communications

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Statistical techniques for the treatment and analysis of experimental data from laboratory reactors were considered, as applied to a CREC Riser Simulator reactor for the example of FCC catalyst evaluation. Deviations in mass balances were reconciliated considering the variance in each product mass. After reconciliations, simple OPE curves were used to fit the data due to their simplicity and proper representation of the yield curves. In the data fitting step, errors in both dependent and independent variables were considered by using information obtained in the reconciliation procedure. The impact of different levels of confidence bands in the models on the discrimination of experimental results was discussed. Significant improvements in catalyst evaluation could be achieved either in the CREC Riser Simulator or other types of laboratory reactors with the help of the statistical procedures described here without increasing substantially the number of experiments.

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Comparison between fixed fluidized bed (FFB) and batch fluidized bed reactors in the evaluation of FCC catalysts

Cited by 29 publications

References 37 publications

Catalytic Cracking of Heavy Aromatics and Polycyclic Aromatic Hydrocarbons over Fluidized Catalytic Cracking Catalysts

Catalytic Cracking of Heavy Aromatics and Polycyclic Aromatic Hydrocarbons over Fluidized Catalytic Cracking Catalysts

Formation of aromatics in heavy gasoline and light LCO ends in FCC

Reliable Laboratory Reactor Data Analysis: Evaluation of Commercial FCC Catalysts in a Batch Fluidized Bed Reactor

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