Multi-stage fluidized bed column: Hydrodynamic study

Singh, Anand Pratap; Verma, Rupesh; Kishore, Kaushal; Verma, Nishith

doi:10.1016/j.cep.2007.03.007

Cited by 21 publications

(22 citation statements)

References 16 publications

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“…However, in the present case, the solid hold-up is also a function of the solid circulation rate in addition to the superficial liquid velocity and physical properties of solid and liquid phases. A similar observation was made in earlier studies of the hydrodynamic characteristics of a multistage SLCFB (Chavan et al, 2009;Singh, Verma, Kishore,& Verma, 2008). The present work employed the MLPNN-based approach to encompass the effect of the solid circulation rate on the solid hold-up in the multistage SLCFB.…”

Section: Mlpnn Modelingmentioning

confidence: 57%

“…For the construction and assessment of the generalization capability of the MLPNN-based model to predict the solid hold-up,experimental data from previous studies (Chavan et al, 2009;Singh et al, 2008) and the present work were considered. An experimental data set, comprising 92 input-output patterns, was randomly partitioned at a ratio of 3:1 into training (69 patterns) and test(23 patterns) sets.…”

Section: Mlpnn Modelingmentioning

confidence: 99%

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Novel multistage solid–liquid circulating fluidized bed: Hydrodynamic characteristics

et al. 2018

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The present work proposes a novel radially cross-flow multistage solid-liquid circulating fluidized bed(SLCFB). The SLCFB primarily consists of a single multistage column (having an inner diameter of 100 mm and length of 1.40 m), which is divided into two sections wherein both the steps of utilization or loading(e.g., adsorption and catalytic reaction) and regeneration of the solid phase can be carried out simultaneously in continuous mode. The hydrodynamic characteristics were studied using ion exchange resin as the solid phase and water as the fluidizing medium. The loading and flooding states were determined for three particle sizes; i.e., 0.30, 0.42, and 0.61 mm. The effects of the superficial liquid velocity and solid feed rate on the solid holdup were investigated under loading and flooding conditions. The solid holdup increases with an increase in the solid feed rate and decreases with an increase in the superficial liquid velocity. An artificialintelligence formalism, namely the multilayer perceptron neural network(MLPNN), was employed for the prediction of the solid holdup. The input space of MLPNN-based model consists of four parameters, representing operating and system parameters of the proposed SLCFB. The developed MLPNN-based model has excellent prediction accuracy and generalization capability.

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Section: Mlpnn Modelingmentioning

confidence: 57%

Section: Mlpnn Modelingmentioning

confidence: 99%

Novel multistage solid–liquid circulating fluidized bed: Hydrodynamic characteristics

et al. 2018

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“…At the HCl concentration 3.0 mol/L, metal ion was almost desorbed from the resin. Generally, the eluting effect is better as the acidity increases, and the 3.0 mol/L HCl solution was chosen as a desirable eluent (32).…”

Section: Elution Testsmentioning

confidence: 99%

Adsorption of Neodymium(III) on Acrylic Resin (110 Resin) from Aqueous Solutions

Xiong

et al. 2014

Separation Science and Technology

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A feasibility of using 110 resin as an adsorbent for Nd(III) was examined with various chemical methods. Batch studies were carried out to determine the influence of operational conditions, such as initial pH of solution, temperature, contact time, and initial concentrations. The optimal conditions in terms of initial pH and equilibrium time was 6.0 (HAc-NaAc system) and 72 h, respectively. The maximum adsorption capacity was estimated to 308 mg/g at 298 K calculating from the Langmuir isotherm. Nd(III) ions could be well eluted by using 3.0 mol/L HCl solution and the absorbent could be regenerated and reused. Thermodynamic and kinetics parameters were studied, from which the adsorption process was spontaneous and the adsorption was endothermic in nature. The Thomas model based on the experimental column study data was used to predict the breakthrough curves and to determine the characteristics parameters of the column useful for process design. Moreover, the adsorption mechanism was proposed by the IR spectroscopic technique.

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“…Basic research, such as gas‐solid hydrodynamics research and stability control for multi‐fluid beds, has always been very active . Besides, multi‐stage fluidized bed reactors have been applied in various fields, such as drying, adsorption, calcination, regeneration of catalyst, etc., and have become an important branch of fluidization .…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous catalysis in multi‐stage fluidized bed reactors: From fundamental study to industrial application

et al. 2019

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The multi-stage fluidized bed (MSFB) reactor with several stages connected in series prevents gas and solids back-mixing effectively and obtains the plug-flow reactor performance. Besides, different process steps can be accomplished in a single reactor by establishing different temperatures and/or concentrations in each stage. Therefore, multi-stage fluidized bed reactors are acknowledged as novel and flexible multi-phase flow reactors for heterogeneous catalytic processes, especially with the intermediates as the desired products. Typical process developments in the industry involve the methanol to aromatics (MTA), regeneration in fluid catalytic cracking (FCC), and hydrogenation of nitrobenzene to aniline. The purpose of this article is to provide a comprehensive review of the fundamental research as well as particular industrial applications on multi-stage fluidized bed reactors in the Fluidization Laboratory of Tsinghua University (FLOTU).

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Multi-stage fluidized bed column: Hydrodynamic study

Cited by 21 publications

References 16 publications

Novel multistage solid–liquid circulating fluidized bed: Hydrodynamic characteristics

Novel multistage solid–liquid circulating fluidized bed: Hydrodynamic characteristics

Adsorption of Neodymium(III) on Acrylic Resin (110 Resin) from Aqueous Solutions

Heterogeneous catalysis in multi‐stage fluidized bed reactors: From fundamental study to industrial application

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