A novel dynamic radial-flow, spherical-bed reactor concept for naphtha reforming in the presence of catalyst deactivation

Iranshahi, Davood; Rahimpour, Mohammad Reza; Asgari, A.

doi:10.1016/j.ijhydene.2010.03.021

Cited by 41 publications

(22 citation statements)

References 28 publications

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“…Amongst different deactivation models, the one presented by Hanken better suited the industrial data of the methanol synthesis reactor because it utilized the data of an industrial plant for deactivation parameter estimations [12]. This model provided in the following form: (10) Here, a denoted the activity of the catalyst pellet and T R , E d and K d were the reference temperature, activation energy and deactivation constant of the catalyst, respectively [12]. The numerical values of these parameters presented in Table 3.…”

Section: Spherical Reactor Modelingmentioning

confidence: 99%

“…Advantages of this type reactor in comparison with the usual conventional TR types are a small pressure drop, low manufacturing costs as a result of a small wall thickness, and a high production capacity [5] hence, better environmental and economic outcomes. Ultimately, good deals of researches were performed on the synthesis of methanol in spherical bed reactors [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Modeling of the Methanol Synthesis Catalyst Deactivation in a Spherical Bed Reactor: An Environmental Challenge

et al. 2014

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Catalyst deactivation and its environmental consequences are believed to be an important issue seriously needed to be dealt with. In this study, a mathematical model of a spherical bed along with the catalyst deactivation in a long-term operation period for the methanol synthesis was investigated. The inside space of the two spheres reactor configuration was filled with the catalyst. The materials in the outer surface of the inner hemisphere were understudied. The equations solved at two dynamic and static levels via the finite difference method. It was revealed that, the resulting pressure drop as well as operation costs might have been lowered while the production capacity enhanced in comparison with the conventional reactors and overall leading to better environment protections. Furthermore, the analysis of the catalyst deactivation behavior indicated that a series of parameters including the reactor temperature and size, as well as the entering carbon monoxide and feed rates played an important role in the catalyst deactivation.

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Section: Spherical Reactor Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of the Methanol Synthesis Catalyst Deactivation in a Spherical Bed Reactor: An Environmental Challenge

et al. 2014

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“…The results of CTR modeling can be found in the previous work. 19 [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]…”

Section: Af-spbmr Modelmentioning

confidence: 99%

“…First, a group of researchers tried to find a proper reaction network such as: Smith 4 (as a pioneer), Weifeng et al, 5 Stijepovic et al, 6 Ramage et al, 7,8 Krane et al, 9 Kmak, 10 Marin et al, 11 and Juarez and Macias. 12 Furthermore, Li et al, 13 Mostafazadeh and Rahimpour, 14 Weifeng et al, 15 Rahimpour, 16 Taskar and Riggs, 17 Juarez et al, 18 and Iranshahi et al 19 have enhanced the production of more valuable products by means of optimizing and improving operating conditions. The last attempts were on the catalyst preparation and the effect of coke deposition on the catalyst surface.…”

Section: Introductionmentioning

confidence: 99%

The aromatic enhancement in the axial‐flow spherical packed‐bed membrane naphtha reformers in the presence of catalyst deactivation

et al. 2011

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Because of some disadvantages of conventional tubular reactors (CTRs), the concept of spherical membrane reactors is proposed as an alternative. In this study, it is suggested to apply hydrogen perm‐selective membrane in the axial‐flow spherical packed‐bed naphtha reformers. The axial flow spherical packed‐bed membrane reactor (AF‐SPBMR) consists of two concentric spheres. The inner sphere is supposed to be a composite wall coated by a thin Pd‐Ag membrane layer. Set of coupled partial differential equations are developed for the AF‐SPBMR model considering the catalyst deactivation, which are solved by using orthogonal collocation method. Differential evolution optimization technique identifies some decision variables which can manipulate the input parameters to obtain the desired results. In addition to lower pressure drop, the enhancement of aromatics yield by the membrane layer in AF‐SPBMR adds additional superiority to the spherical reactor performance in comparison with CTR. © 2011 American Institute of Chemical Engineers AIChE J, 2011

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“…In order to simplify the simulation of the catalytic naphtha reforming process, Smith (1959) has suggested a simple model which contains four dominant reactions. Iranshahi et al (2010b) and Rahimpour et al (2010) investigated the application of the spherical radial flow reactors in naphtha reforming process in order to reduce the pressure drop through the reactors. Iranshahi et al (2010b) and Rahimpour et al (2010) investigated the application of the spherical radial flow reactors in naphtha reforming process in order to reduce the pressure drop through the reactors.…”

Section: Introductionmentioning

confidence: 99%

A comparative study on optimised and non‐optimised axial flow, spherical reactors in naphtha reforming process

et al. 2011

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In this study, the operating conditions of an axial flow spherical reactor have been optimised using a reliable optimisation technique and the results are compared with the results of non-optimised conditions. The dynamic behaviour of the reactor has been considered in the optimisation process and orthogonal collocation method has been used in order to solve the obtained equations from mathematical modelling of the process. The goal of this study is to maximise the aromatics and hydrogen production rate. Therefore, the objective function is the combination of two terms which include the production rate of the mentioned components. The catalyst distribution for each reactor, the inlet pressure of the system, Length per radius for each reactor, the naphtha feed molar flow rate and the hydrogen mole fraction in the recycle stream as well as the inlet temperature of each reactor have been optimised in this study.

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A novel dynamic radial-flow, spherical-bed reactor concept for naphtha reforming in the presence of catalyst deactivation

Cited by 41 publications

References 28 publications

Modeling of the Methanol Synthesis Catalyst Deactivation in a Spherical Bed Reactor: An Environmental Challenge

Modeling of the Methanol Synthesis Catalyst Deactivation in a Spherical Bed Reactor: An Environmental Challenge

The aromatic enhancement in the axial‐flow spherical packed‐bed membrane naphtha reformers in the presence of catalyst deactivation

A comparative study on optimised and non‐optimised axial flow, spherical reactors in naphtha reforming process

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