Trickle Bed
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. MODEL PREDICTIVE CONTROL FOR PRODUCTION OF ULTRA-LOW SULFUR DIESEL IN A HYDROTREATING PROCESS
ABSTRACT There is a continual desire around the world to reduce the sulphur content of diesel fuel to ultra-low levels (below 10 ppm) due to environmental concerns and the intention of improving air quality and lowering harmful exhaust emissions of diesel engines. In this work, a hydrodesulfurization unit fed with multiple diesel streams was addressed using
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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2. SELECTIVE HYDROGENOLYSIS OF GLYCEROL TO PROPYLENE GLYCOL IN A CONTINUOUS FLOW TRICKLE BED REACTOR USING COPPER CHROMITE AND Cu/Al2O3 CATALYSTS
The glycerol hydrogenolysis reaction was performed in a continuous flow trickle bed reactor using a water glycerol feed and both copper chromite and Cu/Al2O3 catalysts. The commercial copper chromite had a higher activity than the laboratory prepared Cu/Al2O3 and was used for most of the tests. Propylene glycol was the main product with both catalysts, aceto
Quím. Nova. Publicado em: 2017-05
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3. Effect of Metal Dispersion on the Hydrogenation of 2-Amyl Anthraquinone over Pd/Al2O3 Catalyst
A series of highly dispersed Pd/Al2O3 catalysts were prepared via the polyol method. The catalysts were characterized by nitrogen adsorption, X-ray diffraction (XRD), UV-Vis spectrophotometry, temperature programmed reduction (TPR) and transmission electron microscopy (TEM). The influence of Pd particle size on the hydrogenation of 2-amyl anthraquinone (AAQ)
J. Braz. Chem. Soc.. Publicado em: 2016-06
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4. Biofiltration of a styrene/acetone vapor mixture in two reactor types under conditions of styrene overloading
This aim of study was to compare the performance of a biofilter (BF) and trickle bed reactor (TBR) under increased styrene loading with a constant acetone load, 2 gc/m3/h. At styrene loading rates up to 30 gc/m3/h, the BF showed higher styrene removal than TBR. However, the BF efficiency started to drop beyond this threshold loading and could never reach ste
Braz. arch. biol. technol.. Publicado em: 2014-10
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5. Avaliação fluidodinâmica do HDT em regime contracorrente com o uso da fluidodinâmica computacional - CFD / Computational fluid dynamics assessment of hydrotreating process in counter current operation
Processos comerciais de hidrotratamento (HDT) normalmente operam em regime de leito gotejante "Trickle bed" em concorrente com fluxos descendentes de gás e de líquido, sobre um leito de partículas de catalisador onde ocorrem as reações. É bem conhecido que a remoção de enxofre é fortemente inibida pelo efeito de adsorção competitiva de H2S nos sí
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2012
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6. Mathematical modeling of a three-phase trickle bed reactor
The transient behavior in a three-phase trickle bed reactor system (N2/H2O-KCl/activated carbon, 298 K, 1.01 bar) was evaluated using a dynamic tracer method. The system operated with liquid and gas phases flowing downward with constant gas flow Q G = 2.50 x 10-6 m³ s-1 and the liquid phase flow (Q L) varying in the range from 4.25x10-6 m³ s-1 to 0.50x10-6
Braz. J. Chem. Eng.. Publicado em: 2012-09
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7. Dynamic evaluation for liquid tracer in a trickle bed reactor
A mathematical model is developed for a liquid flow on solid particles in a trickle bed reactor. A mathematical formulation is followed based on the liquid-solid model approach where the liquid phase with the (KCl) tracer is treated as a continuum. The physical modeling is discussed, including the formulation of initial and boundary conditions and the descri
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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8. Styrene biofiltration in a trickle-bed reactor
The biological treatment of styrene waste gas in a trickle-bed filter (TBF) was investigated. The bioreactor consisted of a two-part glass cylinder (ID 150 mm) filled with 25 mm polypropylene Pall rings serving as packing material. The bed height was 1m. Although the laboratory temperature was maintained at 22 ºC, the water temperature in the trickle-bed fi
Brazilian Archives of Biology and Technology. Publicado em: 2008-04
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9. Start-up and performance characteristics of a trickle bed reactor degrading toluene
The objective of this work was to evaluate toluene degradation in a trickle bed reactor when the loading was carried out by changing the air flow rate. The biofiltration system was inoculated with a mixed microbial population, adapted to degradation of hydrophobic compounds. Polypropylene high flow rings were used as a packing material. The system was operat
Brazilian Archives of Biology and Technology. Publicado em: 2007-09
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10. A kinetic model for the first stage of pygas upgrading
Pyrolysis gasoline - PYGAS - is an intermediate boiling product of naphtha steam cracking with a high octane number and high aromatic/unsaturated contents. Due to stabilization concerns, PYGAS must be hydrotreated in two stages. The first stage uses a mild trickle-bed conversion for removing extremely reactive species (styrene, dienes and olefins) prior to t
Brazilian Journal of Chemical Engineering. Publicado em: 2007-03
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11. Modelagem e simulação de um reator trickle-bed para hidrogenação de propeno
Neste trabalho foi modelado um reator catalítico heterogêneo, pressurizado, adiabático e provido de reciclo. O leito deste reator está dividido em duas partes, sendo que a primeira opera como um reator trickle-bed, enquanto a segunda opera como um reator de leito fixo, onde os regentes estão em fase líquida. Um Sistema de Hidrogenação de Propeno em o
Publicado em: 2007
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12. Modelagem e validaÃÃo do processo contÃnuo de produÃÃo depoliÃis em reator de leito gotejante
In the present work a trickle-bed reactor was employed in order to perform a saccharide hydrogenation process to produce polyols in the presence of a nickel catalyst supported on activated carbon. The catalyst was prepared, characterized and tested. The reactor was assembled charged with the catalyst and the proposed reactions performed. A model was then pro
Publicado em: 2006