A novel configuration for hydrogen production from coupling of methanol and benzene synthesis in a hydrogen-permselective membrane reactor

Khademi, Mohammad Hasan; Jahanmiri, A.; Rahimpour, Mohammad Reza

doi:10.1016/j.ijhydene.2009.04.007

Cited by 77 publications

(38 citation statements)

References 54 publications

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“…This method produces toxic and corrosive components such as CO, CO 2 and H 2 S in addition to trace amounts of ammonia [6]. Dehydrogenation is an attractive choice and alternative for hydrogen production due to its essentially zero CO 2 impact, giving a positive environmental contribution and also solves the troubles and problems in hydrogen storage conditions and mediums preparation, such as metal hydrides [1,7].…”

Section: Hydrogen Productionmentioning

confidence: 99%

“…Abo-Ghander et al [35] investigated co-current and counter-current operation modes for the above configuration and compared the simulation results with achieved corresponding results from an industrial adiabatic fixed-bed reactor at the same feed conditions. Khademi et al [7] considered methanol synthesis coupled with dehydrogenation of cyclohexane, to prepare pure hydrogen, in a co-current reactor.…”

Section: Couplingmentioning

confidence: 99%

“…The effects of some key operational parameters are considered (inlet molar flow rates and inlet temperature of endothermic feed) on methanol and hydrogen yields. A new definition is introduced as follows to examine the reactor performance for hydrogen production [7].…”

Section: Model Validationmentioning

confidence: 99%

“…By increasing in molar flow rate, the amount of reactants going through the exothermic side increases per unit catalyst volume and consequently the methanol production will reduce from 0.41 to 0.19 in co-current and 0.39 to 0.14 for counter-current (see Figure 12 (a)). Increase of molar flow rate in co-current reactor leads to increase the cyclohexane conversion and hydrogen recovery yield; and afterward leads to decrease which is due to difference between total consumed heat flux in endothermic side and total transferred heat flux from the solid wall (see Figure 12 (b, c)) [7]. The maximum of hydrogen and cyclohexane conversions in counter-current reactor will happen at higher molar flow rates of exothermic (compared with co-current).…”

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confidence: 96%

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A comparison of hydrogen and methanol production in a thermally coupled membrane reactor for co-current and counter-current flows

Rahimpour

Pourazadi

2010

Int. J. Energy Res.

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SUMMARYThis work considers three concentric tube reactors to prepare pure hydrogen, especially applicable in fuel cell technologies, with zero CO 2 emission. Hydrogen and methanol production rates are compared in a thermally coupled exothermic and endothermic reactor for co-current and counter-current modes. Synthesis of methanol is coupled with dehydrogenation of cyclohexane as a high content hydrogen carrier (7.1 wt%). The efficient coupling of exothermic and endothermic reactions increases the profitability of operation of the reactor, reduces the size of reactor and decreases the operational and capital costs. By inserting a hydrogen-perm selective membrane into the reactor configuration, hydrogen can permeate selectively into the membrane, and hence, the third tube receives hydrogen. The simulation results are compared with the corresponded results for an industrial methanol fixed-bed reactor, which operates under the same feed conditions. The influence of some operating variables is investigated on methanol and hydrogen yields during the performance of reactor. The results show higher methanol conversion, as the same as conventional reactor, and hydrogen for co-current flow.

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Section: Hydrogen Productionmentioning

confidence: 99%

Section: Couplingmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

mentioning

confidence: 96%

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A comparison of hydrogen and methanol production in a thermally coupled membrane reactor for co-current and counter-current flows

Rahimpour

Pourazadi

2010

Int. J. Energy Res.

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“…[3][4][5] In den vergangenen Jahren konzentrierten sich die meisten dieser Studien auf die Verknüpfung einer endothermen Dehydrierung mit einer exothermen Hydrierung von Kohlenwasserstoffen in einem Pd-Membranreaktor. [6,7] Solche gekoppelten Dehydrierungen/Hydrierungen werden auch in Festbettreaktoren untersucht; ein Beispiel ist die simultane Dehydrierung von Ethylbenzol und Hydrierung von Benzol. [8] Vor einiger Zeit berichteten Kondratenko et al über die Herstellung von Ethylen bei gleichzeitig annähernd 100-proz.…”

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