CFD Modelling of the Dehydrogenation Reaction of Isobutane to Isobutylene in a Fixed Bed Reactor

2016 ◽  
Author(s):  
Tarek J. Jamaleddine ◽  
Ramsey M. Bunama
Keyword(s):  
Flow Behavior ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Spherical Particles ◽  
Similar Process ◽  
Catalytic Dehydrogenation ◽  
Cfd Modelling ◽  
Dehydrogenation Reaction ◽  
Oxide Support ◽  
Reaction Models

The catalytic dehydrogenation reaction of isobutane to isobutylene is simulated in a commercial-scale heterogenous fixed bed reactor (FBR). The porous medium method in ANSYS Fluent combined with the reaction model capability was utilized to predict the flow behavior and species transport in a bed of spherical particles. Physical and material properties of a dehydrogenating catalyst of Chromium Oxide (Cr2O3) on Aluminum Oxide Support (Al2O3) were employed in the model. Several reaction models were implemented using a customized User-defined Function (UDF) subroutine. Simulation results were validated against literature data for a similar process. Good agreement was observed for the conversion of alkanes to alkenes within acceptable accuracy. It is concluded that the power-law model showed the least fit for the feed conversion and product selectivity compared to the other studied reaction models.

scholarly journals Study on Low-Temperature Catalytic Dehydrogenation Reaction of Tail Chlorine by Pd/Al2O3

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Hanhan Wang ◽  
Tingting Lu ◽  
Yuna Li ◽  
Bo Wu ◽  
Jianwei Xue ◽  
...  
Keyword(s):  
Low Temperature ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Incipient Wetness Impregnation ◽  
Catalytic Dehydrogenation ◽  
Impregnation Method ◽  
Pd Catalysts ◽  
Dehydrogenation Reaction ◽  
Loading Amount ◽  
Oxygen Reaction

The catalytic dehydrogenation reaction of tail chlorine by Pd was studied using a fixed-bed reactor at low temperature from 30 to 100°C. Different catalyst supports such as SiO2 and Al2O3 were applied to prepare Pd catalysts by the incipient-wetness impregnation method. And the catalysts were characterized by XRD, FTIR, XPS, SEM, and N2 adsorption-desorption. The catalyst Pd loading on both SiO2 and Al2O3 had a catalytic effect on the dehydrogenation reaction, but the carrier Al2O3 was more superior. The hydrogen conversion and selectivity of hydrogen-oxygen reaction increased first and then decreased with Pd loading amount and temperature by using Pd/Al2O3 as catalysts, but the influence of temperature was limited when it was higher than 60°C. The hydrogen conversion was 97.38% and selectivity of hydrogen-oxygen reaction was 79% when the reaction temperature was at 60°C with 1 wt.% Pd/Al2O3.

LPG Synthesis from Syngas over Cu/ZnO-Pd-β Catalysts Prepared by Ultrasonic Spray Pyrolysis

2015 ◽  
Vol 659 ◽  
pp. 252-256
Author(s):  
Sudarat Chaiwatyothin ◽  
Wittawat Ratanathavorn ◽  
Tharapong Vitidsant ◽  
Prasert Reubroycharoen
Keyword(s):  
Spray Pyrolysis ◽  
Fixed Bed ◽  
Ultrasonic Spray Pyrolysis ◽  
Product Distribution ◽  
Fixed Bed Reactor ◽  
Spherical Particles ◽  
Gaseous State ◽  
X Ray ◽  
Ultrasonic Spray ◽  
Co Conversion

Synthesis of nanoCu/ZnO catalyst for LPG production was prepared by ultrasonic spray pyrolysis (USP). Hollow spherical particles were obtained by USP technique using an aqueous solution of Cu (NO3)3.6H2O and Zn (NO3)3.3H2O with different concentration of 0.05, 0.1 and 0.5 molar under the pyrolysis temperatures of 600, 700 and 800°C. Mists of the solution were generated from the precursor solution by ultra sonic vibrators at frequency of ~1.7 MHz. The physicochemical properties of catalysts were characterized by X-ray diffraction, temperature-programmed reduction, scanning electron microscope, nitrogen adsorption-desorption, and energy dispersive X-ray spectrometer. The results showed that increasing in precursor concentration resulted in a large particle and particles size distributed in a range of 0.63-1.21 μm. Particles prepared at pyrolysis temperature 700°C exhibited homogeneous in size and shape compared to other temperature. The catalytic activity of nanoCu/ZnO-Pd-β catalysts was performed in a fixed-bed reactor for synthesizing LPG. The reaction took place at 260°C, 3.0 MPa, and the ratio of H2/CO = 2/1. All the products from the reactor were in gaseous state, and analyzed by on-line gas chromatography. The results showed that %CO conversion was high but decreased rapidly with increasing reaction time. Cu/ZnO catalyst prepared by co-precipitation gave higher %CO conversion than that prepared by ultrasonic spray pyrolysis. Moreover, hydrocarbon product distribution for Cu/ZnO catalyst produced at concentration 0.1 M 700°C by ultrasonic spray pyrolysis gave the highest LPG selectivity.

scholarly journals Kinetic Model of Crude Palm Oil Hydrocracking Over Ni/Mo ZrO2–Pillared Bentonite Catalyst

2019 ◽  
Vol 64 (2) ◽  
pp. 238-247 ◽  
Author(s):  
Hasanudin Hasanudin ◽  
Addy Rachmat ◽  
Muhammad Said ◽  
Karna Wijaya
Keyword(s):  
Kinetic Model ◽  
Palm Oil ◽  
Rate Constants ◽  
Catalyst Activity ◽  
Fixed Bed ◽  
Diesel Oil ◽  
Fixed Bed Reactor ◽  
Crude Palm Oil ◽  
Reaction Models ◽  
Oil Gas

Crude Palm Oil hydrocrcaking has been carried out over Ni/Mo ZrO2–pillared bentonite catalyst in a fixed bed reactor. Crude Palm Oil hydrocracking over Ni/Mo ZrO2–pillared bentonite catalyst formed 3 products i.e. gas, oil and coke. The oil product from Crude Palm Oil hydrocracking was analyzed by using gas chromatography to determine its composition. Three types of fraction were classified i.e. gasoline, kerosene and diesel oil. In this research, the focused of the study is of hydrocracking kinetics by using lump kinetic models. The kinetic model was solved by using the software MATLAB R2018b involves the effect of catalyst activity on the reaction rate. The results of the kinetic study show that the 4-lump (Crude Palm Oil, gas coke and oil) and 6-lump reaction models (Crude Palm Oil, gas, coke, gasoline, kerosene and diesel) can be used to explain the Crude Palm Oil hydrocracking over Ni/Mo ZrO2–pillared bentonite catalyst. The 4-lump kinetic model has 5 rate constants and the 6-lump kinetic model has 14 rate constants.

scholarly journals Microwave-assisted direct synthesis of butene from high-selectivity methane

2017 ◽  
Vol 4 (12) ◽  
pp. 171367
Author(s):  
Yi-heng Lu ◽  
Kang Li ◽  
Yu-wei Lu
Keyword(s):  
Methane Conversion ◽  
Liquid Fuel ◽  
Impact Ionization ◽  
Direct Synthesis ◽  
Fixed Bed ◽  
Volume Ratio ◽  
Raw Material ◽  
Fixed Bed Reactor ◽  
Ionization Mass ◽  
Catalytic Dehydrogenation

Methane was directly converted to butene liquid fuel by microwave-induced non-oxidative catalytic dehydrogenation under 0.1–0.2 MPa. The results show that, under microwave heating in a two-stage fixed-bed reactor, in which nickel powder and NiO x –MoO y /SiO 2 are used as the catalyst, the methane–hydrogen mixture is used as the raw material, with no acetylene detected. The methane conversion is more than 73.2%, and the selectivity of methane to butene is 99.0%. Increasing the hydrogen/methane feed volume ratio increases methane conversion and selectivity. Gas chromatography/electron impact ionization/mass spectrometry chromatographic analysis showed that the liquid fuel produced by methane dehydrogenation oligomerization contained 89.44% of butene, and the rest was acetic acid, ethanol, butenol and butyric acid, and the content was 1.0–3.0 wt%.

3D CFD modeling of acetone hydrogenation in fixed bed reactor with spherical particles

Particuology ◽  
2013 ◽  
Vol 11 (6) ◽  
pp. 715-722 ◽  
Author(s):  
Xiaoming Zhou ◽  
Yanjun Duan ◽  
Xiulan Huai ◽  
Xunfeng Li
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Spherical Particles ◽  
Cfd Modeling ◽  
Acetone Hydrogenation

CFD simulation of the ethylbenzene dehydrogenation reaction in the fixed bed reactor with a cylindrical catalyst of various sizes

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sergei A. Solovev ◽  
Olga V. Soloveva ◽  
Daniel L. Paluku ◽  
Alexander A. Lamberov
Keyword(s):  
Size Effect ◽  
Cfd Simulation ◽  
Fixed Bed ◽  
Total Surface Area ◽  
Fixed Bed Reactor ◽  
Pressure Drops ◽  
Dehydrogenation Reaction ◽  
Ethylbenzene Dehydrogenation ◽  
Detailed Evaluation ◽  
Porosity Effect

Abstract In this paper, the Discrete Element Method of simulation was used to study the catalytic granule size effect on the efficiency of a bed reactor for the ethylbenzene dehydrogenation reaction. The model constructed for the laboratory experiment was made of catalyst granules of lengths 3, 6 and 9 mm, and diameters 2.8, 3, and 3.2 mm. A detailed evaluation of the catalyst total surface area and porosity effect was conducted owing to the analysis of particles size effect on the packing. Different results were observed for a wide feed gas mixture rate. Calculations performed allowed to deduce dependences of the reaction product concentration, the pressure drops, and the reactor productivity for all the particle sizes investigated.

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