INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
Comparison between MAT Flow Fixed Bed and Batch Fluidized Bed Reactors in the Evaluation of FCC Catalysts. 1. Conversion and Yields of the Main Hydrocarbon Groups
Autor/es:
FRANCISCO J. PASSAMONTI; GABRIELA DE LA PUENTE; ULISES SEDRAN
Revista:
ENERGY & FUELS (PRINT)
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2009 vol. 23 p. 1358 - 1363
ISSN:
0887-0624
Resumen:
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A comparison was performed between the performances of a MAT type
reactor (flow fixed bed) and a CREC Riser Simulator reactor (batch fluidized
bed) in the conversion of two VGO feedstocks (aromatic and paraffinic types)
over three commercial equilibrium FCC catalysts, under similar conditions. In
both units the reaction temperatures were 500 and 550 ºC. The catalyst to oil
relationships were from 2.3 to 6.2 (cumulative) and 6.2, and the times were
from 15 to 40 s (time on stream) and from 5 to 30 s (reaction time) in the MAT
reactor and the CREC Riser Simulator reactor, respectively. The comparison of
the product yield structure in each unit at the same conversion showed that
they were very different, due to the significant differences in the contact
between reactants and catalyst and operative modes. Results were compared in
terms of VGO conversion and the yields of the most important hydrocarbon groups
LPG, gasoline and coke. Some advantages were observed with data from the CREC
Riser Simulator reactor, derived from the fact that yields are in general
closer to commercial values, mainly concerning gasoline and coke. The yields of
the main hydrocarbon groups also followed linear behaviors in this reactor,
thus being easier to analyze, as selectivities did not depend on the conversion
reached. On the contrary, yields showed a strong dependency on conversion in
the MAT reactor, particularly in the cases of gasoline and coke. The high coke
yield in the first moments of the experiments in the MAT reactor could lead to
modifications in the selectivities to certain reactions and products.