A numerical comparison of alternative three-phase reactors with a conventional trickle-bed reactor. The advantages of countercurrent flow for hydrodesulfurization

1999 ◽  
Vol 54 (21) ◽  
pp. 4791-4799 ◽  
Author(s):  
B.W. van Hasselt ◽  
P.J.M. Lebens ◽  
H.P.A. Calis ◽  
F. Kapteijn ◽  
S.T. Sie ◽  
...  
Keyword(s):  
Numerical Comparison ◽  
Countercurrent Flow ◽  
Trickle Bed Reactor ◽  
Three Phase ◽  
Trickle Bed

APPLICATION OF A THREE PHASE HETEROGENEOUS MODEL TO ANALYSE THE PERFORMANCE OF A PILOT PLANT TRICKLE BED REACTOR

2002 ◽  
Vol 20 (3-4) ◽  
pp. 251-268 ◽  
Author(s):  
M. Bhaskar ◽  
G. Valavarasu ◽  
A. Meenakshisundaram ◽  
K. S. Balaraman
Keyword(s):  
Pilot Plant ◽  
Heterogeneous Model ◽  
Trickle Bed Reactor ◽  
Three Phase ◽  
Trickle Bed

Catalytic Oxidation of Substituted Phenols in a Trickle Bed Reactor

1997 ◽  
Vol 62 (6) ◽  
pp. 866-874 ◽  
Author(s):  
Vratislav Tukač ◽  
Jiří Hanika
Keyword(s):  
Active Carbon ◽  
Space Velocity ◽  
Hydrodynamic Effect ◽  
Catalytic Wet Oxidation ◽  
Trickle Bed Reactor ◽  
Three Phase ◽  
Comparable Activity ◽  
Trickle Bed ◽  
The Stability ◽  
Active Carbon Black

The catalytic wet oxidation was studied of phenol, 2-aminophenol, salicylic acid and 5-sulfosalicylic acid performed in a laboratory trickle bed reactor. A three-phase high-pressure catalytic reactor with an inside diameter of 18 mm and length of catalytic bed of 200 mm was operated at temperatures 90-180 °C, pressures 2-7 MPa and liquid space velocity 1-10 h-1. Simultaneously, the catalytic activity and the stability of extruded active carbon black Chezacarb and active carbon Chemviron were tested. At a comparable activity, the active carbon Chemviron exhibited a greater mechanical strength and stability. The influence of phenol substituents on the oxidation conversion corresponded to their inductive effect: The electropositive amino group supported the oxidation, on the contrary, the presence of carboxy and sulfo groups on aromatic ring led to only low conversion. The complications on evaluating the experimental data are caused by the non-isothermal temperature profile along the catalyst bed, the non-ideal oxygen dissolution in aqueous solutions and especially the hydrodynamic effect of flow rate on the degree of catalyst wetting and thus on the entire effectiveness of the oxidation process.

Mathematical Modeling of Gas Oil HDS and Optimization of Operational Conditions in Trickle Bed Reactor by Genetic Algorithm

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Reza Abbasi ◽  
Shohreh Fatemi
Keyword(s):  
Genetic Algorithm ◽  
Film Theory ◽  
Gas Oil ◽  
Trickle Bed Reactor ◽  
Operational Conditions ◽  
Three Phase ◽  
Multivariable Process ◽  
Trickle Bed ◽  
Rigorous Model ◽  
Liquid And Solid Phases

The present work aims to employ genetic algorithm (GA) to optimize a HDS process, which is difficult to optimize by conventional methods. The considered chemical process is the three phase catalytic trickle-bed reactor in which hydrodesulphurization reaction occurs. Non-linear kinetics coupled with the transitional mathematical model of the gas, liquid and solid phases are used to describe the dynamic behavior of the multivariable process. The model, based on a two-film theory, was tested with regards to hydrodesulphurization of vacuum gas oil in a high-pressure pilot plant operated under isothermal conditions. Due to the high dimensionality and non-linearity of the model, a rigorous one, the solution of the optimization problem through conventional algorithms does not always lead to the convergence. This fact justifies the use of an evolutionary method, based on the GAs, to deal with this process. In this way, in order to optimize the process, the GA code is coupled with the rigorous model of the reactor. The aim of the optimization through GAs was to search for the optimal conditions that minimize the gas make and sulfur content of the outlet oil. Many simulations are conducted in order to find the maximization of the objective function without violating the constraints. The results show that the GA is used successfully in the process optimization.

Three-phase trickle-bed reactor model for industrial hydrotreating processes: CFD and experimental verification

2020 ◽  
Vol 208 ◽  
pp. 106496
Author(s):  
Antônio Tavernard Pereira Neto ◽  
Thalita Cristine Ribeiro Lucas Fernandes ◽  
Heleno Bispo da Silva Junior ◽  
Antônio Carlos Brandão de Araújo ◽  
José Jailson Nicácio Alves
Keyword(s):  
Experimental Verification ◽  
Reactor Model ◽  
Trickle Bed Reactor ◽  
Three Phase ◽  
Trickle Bed

Wall flow in trickle bed reactor

1975 ◽  
Vol 40 (10) ◽  
pp. 3145-3152 ◽  
Author(s):  
J. Prchlík ◽  
J. Soukup ◽  
V. Zapletal ◽  
V. Růžička ◽  
P. Kovařík
Keyword(s):  
Trickle Bed Reactor ◽  
Wall Flow ◽  
Trickle Bed

Mass Transfer Limited Wet Oxidation in Trickle-Bed Reactor

1998 ◽  
Vol 63 (11) ◽  
pp. 1938-1944 ◽  
Author(s):  
Vratislav Tukač ◽  
Jiří Vokál ◽  
Jiří Hanika
Keyword(s):  
Supported Catalyst ◽  
Reaction Rates ◽  
Gas Transfer ◽  
Wet Oxidation ◽  
Reactor Performance ◽  
Catalytic Wet Oxidation ◽  
Environmental Application ◽  
Trickle Bed Reactor ◽  
Fine Glass ◽  
Trickle Bed

Catalytic activity of CuO-supported catalyst in phenol oxidation, and the influence of reaction conditions, viz. temperature (125-170 °C), oxygen partial pressure (1-7 MPa) and liquid feed (30-760 ml h-1), in the continuous operation using 17.9 mm i.d. trickle-bed reactor is presented. The hydrodynamic impact on the three-phase trickle-bed reactor performance in an environmental application of catalytic wet oxidation was also investigated. The results of trickle-bed operation were strongly influenced by wetting efficiency. An insufficient catalyst wetting can be to compensated by filling the catalyst bed voids by fine glass spheres. In the case of the gas transfer limited reaction, a better wetting of the catalyst can lead to worse reactor performance due to lower reaction rates.

scholarly journals Selecting carrier material for efficient biomethanation of industrial biogas-CO2 in a trickle-bed reactor

2021 ◽  
Vol 51 ◽  
pp. 101611
Author(s):  
Mads Borgbjerg Jensen ◽  
Súsanna Poulsen ◽  
Bjarke Jensen ◽  
Anders Feilberg ◽  
Michael Vedel Wegener Kofoed
Keyword(s):  
Trickle Bed Reactor ◽  
Carrier Material ◽  
Trickle Bed
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