Hydrodynamics and flow regime transition study of trickle bed reactor at elevated temperature and pressure

Al-Naimi, Safa A.; Al-Sudani, F. T.; Halabia, Essam K.

doi:10.1016/j.cherd.2010.11.008

Cited by 18 publications

(9 citation statements)

References 22 publications

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“…Prior work related to bubbly flow in trickle-bed reactors is more often concerned with the transition from pulsing to bubbly flow occurring at higher gas and liquid superficial velocities than the trickle–bubbly transition. , Quantitative measurements of the trickle-bubbly transition are less common. In general, studies related to the flow regime transition in trickle-bed reactors are restricted to gas superficial velocities greater than 30 mm/s. − A thorough investigation of the trickle–bubbly transition is not available in the literature. Wammes et al observed both the trickle–bubbly and pulsing–bubbly transitions based on visual observations .…”

Section: Introductionmentioning

confidence: 99%

Effects of Prewetting on Bubbly- and Pulsing-Flow Regime Transitions in Trickle-Bed Reactors

Honda

Lehmann

Hickman

et al. 2015

Ind. Eng. Chem. Res.

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The transitions from trickle to bubbly flow and trickle to pulsing flow are investigated in the range of gas superficial velocities v G = 4−220 mm/s using air and water, with additional consideration of the effect of the prewetting procedure. The flow regime transition was detected by the standard deviation of the pressure drop and visual observation, with further confirmation using a high-speed camera. Results show a significant effect of the prewetting procedure on the liquid superficial velocity at a fixed gas superficial velocity required for transition from trickle to bubbly flow and trickle to pulsing flow. At low gas superficial velocities, where the transition from trickle to bubbly flow occurs, a significant departure from literature model predictions is observed. Below v G = 20 mm/s, rather than the expected increase in the liquid superficial velocity required for transition with decreasing gas superficial velocity, the transition is observed to be essentially independent of the gas flow.

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Section: Introductionmentioning

confidence: 99%

Effects of Prewetting on Bubbly- and Pulsing-Flow Regime Transitions in Trickle-Bed Reactors

Honda

Lehmann

Hickman

et al. 2015

Ind. Eng. Chem. Res.

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“…25−27 Most industrial processes operate in trickle flow regime, especially in the processes of hydrogenation, while others operate in pulsing flow regime (e.g., hydrotreating processes) due to the energetic interactions between the phases. 27 Trickle flow is observed at relatively low gas and liquid flow rates and is characterized by liquid phase flowing, driven by gravity, in the form of films or rivulets. The Pressure drops through the bed remain low, and so the interaction between the gas and liquid phases is referred to as the low interaction regime.…”

Section: Mathematical Modelingmentioning

confidence: 99%

DE Approach in Development of a Detailed Reaction Network for Liquid Phase Selective Hydrogenation of Methylacetylene and Propadiene in a Trickle Bed Reactor

Samimi

Ahmadi

Dehghani

et al. 2014

Ind. Eng. Chem. Res.

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Methylacetylene (MA) and propadiene (PD) present in the raw C 3 cut, as the major source of propylene production, are poisonous to catalyst for polymerization plants. So a methylacetylene−propadiene (MAPD) converter is usually required to improve the yield as well as purity of the propylene stream by reduction of the amount of MA and PD present in the raw C 3 cut. In this study, a mathematical modeling is developed for an industrial liquid phase selective hydrogenation of MAPD. In the process model, a new reaction network based on 6 reactions considering green oil formation and unsaturated C 4 -cut compounds hydrogenation is proposed. To accomplish this purpose, a Langmuir−Hinshelwood−Hougen−Watson (LH-HW) mechanism is used for this process on an industrial scale. To estimate the reaction rate parameters, the absolute deviations between the model results and the plant data are minimized by applying a differential evolution (DE) optimization technique. To prove the accuracy of the proposed model, simulation results are compared with plant data, and an acceptable agreement is achieved. Then molar flow rates of components, reaction rates profiles, thermal behavior, as well as physical and hydrodynamic properties are verified along the reactor.

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“…Observably, the reactor's efficiency may be influenced by the nonideality factor, which is higher than the pulse and trickle-flow regimes. Al-Naimi et al [8] studied the hydrodynamics of TBRs in nonambient conditions for air-water and air-acetone systems, which represent pure organic liquids with low surface tension.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Jatropha Oil Hydrocracking in a Trickle-Bed Reactor to Produce Green Fuel

Muharam

Dianursanti

Wirya

2021

International Journal of Chemical Engineering

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Trickle-bed reactor (TBR) modelling to produce green fuel via hydrocracking of jatropha oil using silica-alumina-supported Ni-W catalysts was performed in this research. The objectives of this study are to obtain a TBR with good heat transfer and the optimum condition for high purities of products. A two-dimensional axisymmetric model with a diameter of 0.1 m and a length of 10 m was used as a representative of the actual TBR system. Heterogeneous phenomenological models were developed considering mass, energy, and momentum transfers. The optimisation was conducted to obtain the highest green fuel purity by varying catalyst particle diameter, inlet gas velocity, feed molar ratio, and inlet temperature. The simulation shows that a TBR with an aspect ratio of 100 has achieved a good heat transfer. The diesel purity reaches 44.22% at 420°C, kerosene purity reaches 21.39% at 500°C, and naphtha purity reaches 25.30% at 500°C. The optimum condition is reached at the catalyst diameter of 1 mm, the inlet gas velocity of 1 cm/s, the feed molar ratio of 105.5, and the inlet temperature at 500°C with the green fuel purity of 69.4%.

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Hydrodynamics and flow regime transition study of trickle bed reactor at elevated temperature and pressure

Cited by 18 publications

References 22 publications

Effects of Prewetting on Bubbly- and Pulsing-Flow Regime Transitions in Trickle-Bed Reactors

Effects of Prewetting on Bubbly- and Pulsing-Flow Regime Transitions in Trickle-Bed Reactors

DE Approach in Development of a Detailed Reaction Network for Liquid Phase Selective Hydrogenation of Methylacetylene and Propadiene in a Trickle Bed Reactor

Modelling of Jatropha Oil Hydrocracking in a Trickle-Bed Reactor to Produce Green Fuel

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